Updated on 2024/03/21

写真a

 
KUMAGAI Hiroyuki
 
Organization
Graduate School of Environmental Studies Department of Earth and Environmental Sciences Earth and Planetary Physics Professor
Graduate School
Graduate School of Environmental Studies
Undergraduate School
School of Science
Title
Professor

Degree 1

  1. 博士(理学) ( 1994.4   名古屋大学 ) 

Research Interests 2

  1. 地震発生物理学

  2. 火山地震学

Research History 4

  1. Professor, Nagoya University

    2013.2

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    Country:Japan

  2. Senior Researcher, National Research Institute for Earth Science and Disaster Prevention

    2001.1 - 2013.2

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    Country:Japan

  3. Senior Researcher, National Research Institute for Earth Science and Diaster Prevention

    2000.5 - 2001.1

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    Country:Japan

  4. Assistant Professor, Nagoya University

    1993.10 - 2000.5

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    Country:Japan

Education 3

  1. Nagoya University   Graduate School, Division of Natural Science

    1991.4 - 1993.9

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    Country: Japan

  2. Nagoya University   Graduate School, Division of Natural Science

    1989.4 - 1991.3

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    Country: Japan

  3. Okayama University   Faculty of Science

    1985.4 - 1989.3

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    Country: Japan

Professional Memberships 4

  1. 日本地震学会

  2. 日本火山学会

  3. 日本惑星科学会

  4. アメリカ地球物理学連合

 

Papers 87

  1. 1999 年伊豆大島における人工地震探査 ─観測および初動走時データによる 3 次元地震波速度構造─

    渡辺秀文, 鍵山恒臣, 坂下至功, 及川 純, 大湊隆雄, 小山悦郎, 辻 浩, 宗包浩志, 松下誠司, 萩原道徳, 竹田豊太郎, 長田 昇, 井本良子, 青山 裕, 浜田盛久, 趙 燕来, Mossa Hesham, 福満修一郎, 青木重樹, 藤原健治, 池田 靖, 加治屋秋実, 安藤 忍, 亀井 守, 古田雅和, 浅沼光輝, 佐藤勝良, 山賀一章, 石脇 誠, 広瀬淳司, 干場三寛, 福田 直, 坂 勝仁, 森 済, 勝俣 啓, 前川徳光, 岡田 弘, 田中 聡, 山脇輝夫, 仁田交市, 橋野弘憲, 野津憲治, Pedro A. Hernandez, 下池洋一, R. Noemi Lima, 野上健治, 平林順一, 鈴木 隆, 熊谷博之, 他19名

    地震研究所彙報   Vol. 98   page: 1 - 29   2023.10

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    Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

  2. Temporal evolution of the magmatic system at Nevado del Ruiz Volcano (Colombia) inferred from long-period seismic events in 2003-2020 Reviewed International coauthorship

    Solórzano, LM; Molina, I; Kumagai, H; Taguchi, K; Torres, R; Cano, LCG; López, CM

    JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   Vol. 438   2023.6

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  3. Topographic Degradation Processes of Lunar Crater Walls Inferred From Boulder Falls Reviewed

    Ikeda Ayame, Kumagai Hiroyuki, Morota Tomokatsu

    JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS   Vol. 127 ( 10 )   2022.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2021JE007176

    Web of Science

  4. Plume height, duration and volume of sustained explosive eruptions inferred from eruption tremor amplitudes International coauthorship

    Mori Azusa, Kumagai Hiroyuki, Londono John Makario

    GEOPHYSICAL JOURNAL INTERNATIONAL   Vol. 231 ( 2 ) page: 1045 - 1056   2022.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/gji/ggac239

    Web of Science

  5. Source models of long-period seismic events at Galeras volcano, Colombia Reviewed International coauthorship

    Torres Roberto, Kumagai Hiroyuki, Taguchi Kimiko

    GEOPHYSICAL JOURNAL INTERNATIONAL   Vol. 227 ( 3 ) page: 2137 - 2155   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/gji/ggab325

    Web of Science

  6. コロンビアにおける地震・津波・火山災害の軽減に向けた日本の貢献 Invited

    熊谷博之

    地震ジャーナル   Vol. 71   page: 41 - 47   2021.6

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    Authorship:Lead author   Language:Japanese  

  7. Overview of the January 2020 Eruptions at Taal Volcano (Philippines) and Related Disaster-mitigation Response Reviewed

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN   Vol. 66 ( 1 ) page: 45 - 53   2021.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.18940/kazan.66.1_45

    DOI: 10.18940/kazan.66.1_45

  8. Empirical formula for the quality factors of crack resonances and its application to the estimation of source properties of long-period seismic events at active volcanoes Reviewed International coauthorship

    Kimiko Taguchi, Hiroyuki Kumagai, Yuta Maeda, and Roberto Torres

    GEOPHYSICAL JOURNAL INTERNATIONAL   Vol. 224   page: 2131 - 2148   2021.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/gji/ggaa519

  9. Temporal change of the magma plumbing system at Galeras volcano, Colombia, revealed by repeated seismic tomography in 2009-2018

    Makario Londono John, Kumagai Hiroyuki, Torres Roberto

    JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   Vol. 406   2020.11

  10. Scattering and Attenuation Characteristics at Volcanoes Inferred From Envelope Widths of Natural and Active Seismic Sources

    Kumagai Hiroyuki, Torres Roberto, Maeda Yuta

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   Vol. 125 ( 11 )   2020.11

  11. Repeating Earthquakes Along the Colombian Subduction Zone

    Bermudez-Barrios Juan Carlos, Kumagai Hiroyuki

    JOURNAL OF DISASTER RESEARCH   Vol. 15 ( 5 ) page: 645 - 654   2020.8

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  12. Estimating plume heights of explosive eruptions using high-frequency seismic amplitudes

    Mori Azusa, Kumagai Hiroyuki

    GEOPHYSICAL JOURNAL INTERNATIONAL   Vol. 219 ( 2 ) page: 1365 - 1376   2019.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/gji/ggz374

    Web of Science

  13. Amplitude Source Location Method With Depth-Dependent Scattering and Attenuation Structures: Application at Nevado del Ruiz Volcano, Colombia

    Kumagai Hiroyuki, Makario Londono John, Maeda Yuta, Acevedo Rivas Alvaro Esteban

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   Vol. 124 ( 11 ) page: 11585 - 11600   2019.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2019JB018156

    Web of Science

  14. Envelope Widths of Volcano-Seismic Events and Seismic Scattering Characteristics Beneath Volcanoes Reviewed

    Kumagai Hiroyuki, Makario Londono John, Maeda Yuta, Lopez Velez Cristian Mauricio, Lacson Rudy Jr.

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   Vol. 123 ( 11 ) page: 9764-9777   2018.11

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2018JB015557

    Web of Science

  15. Source Properties and Triggering Processes of Long-Period Events Beneath Volcanoes Inferred From an Analytical Formula for Crack Resonance Frequencies Reviewed

    Taguchi Kimiko, Kumagai Hiroyuki, Maeda Yuta, Torres Roberto

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   Vol. 123 ( 9 ) page: 7550-7565   2018.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2018JB015866

    Web of Science

  16. 4D seismic tomography of Nevado del Ruiz Volcano, Colombia, 2000-2016 Reviewed

    Makario Londono John, Kumagai Hiroyuki

    JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   Vol. 358   page: 105-123   2018.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jvolgeores.2018.02.015

    Web of Science

  17. Theoretical basis of the amplitude source location method for volcano-seismic signals Reviewed

    Morioka Hanae, Kumagai Hiroyuki, Maeda Takuto

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   Vol. 122 ( 8 ) page: 6538-6551   2017.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/2017JB013997

    Web of Science

  18. Depth-dependent rupture mode along the Ecuador-Colombia subduction zone Reviewed

    Yoshimoto Masahiro, Kumagai Hiroyuki, Acero Wilson, Ponce Gabriela, Vasconez Freddy, Arrais Santiago, Ruiz Mario, Alvarado Alexandra, Pedraza Garcia Patricia, Dionicio Viviana, Chamorro Orlando, Maeda Yuta, Nakano Masaru

    GEOPHYSICAL RESEARCH LETTERS   Vol. 44 ( 5 ) page: 2203-2210   2017.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/2016GL071929

    Web of Science

  19. A generalized equation for the resonance frequencies of a fluid-filled crack Reviewed

    Maeda, Y. and H. Kumagai

    Geophys. J. Int.   Vol. 209   page: 192-201   2017.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/gji/ggx019

  20. Near-field tsunami forecast system based on near real-time seismic moment tensor estimation in the regions of Indonesia, the Philippines, and Chile Reviewed

    Inazu, D., N. Pulido, E.Fukuyama, T.Saito, J. Senda, and H. Kumagai

    Earth Planets Space   Vol. 68:73   2016.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: doi:10.1186/s40623-016-0445-x

  21. Discriminating non-seismic long-period pulses and noise to improve earthquake source inversion Reviewed

    Sakai, T., H. Kumagai, N. Pulido, J. Bonita, and M. Nakano

    Earth Planets Space   Vol. 68:50   2016.4

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    DOI: doi:10.1186/s40623-016-0426-0

  22. On volume-source representations based on the representation theorem Invited Reviewed

    Ichihara, M.,T. Kusakabe, N. Kame, and H. Kumagai

    Earth Planets Space   Vol. 68:14   2016.1

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    DOI: doi:10.1186/s40623-016-0387-3

  23. 表現定理とグリーン関数(2)─体積震源のモーメントテンソル表現─ Reviewed

    日下部哲也, 亀伸樹, 市原美恵, 熊谷博之

    地震第2輯   Vol. 68   page: 169-176   2016

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    Language:Japanese  

    DOI: doi:10.4294/zisin.68.169

  24. An approach to source characterization of tremor signals associated with eruptions and lahars Invited Reviewed

    Kumagai, H., P. Mothes, M. Ruiz, and Y. Maeda

    Earth Planets Space   Vol. 67:178   2015.11

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    DOI: doi:10.1186/s40623-015-0349-1

  25. Performance of broadband seismic network of the Philippines Reviewed

    Melosantos, A. A., K. V. C. Soriano, P. C. M. Alcones, J. U. Pantig, J. D. Bonita, I. C. Narag, H. Kumagai, and H. Inoue

    J. Disast. Res.   Vol. 10   page: 8-17   2015.2

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  26. Regional moment tensor analysis in the Philippines: CMT solutions in 2012-2013 Reviewed

    Bonita, J. D., H. Kumagai, M. Nakano

    J. Disast. Res.   Vol. 10   page: 25-34   2015.2

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  27. Development and operation of a regional moment tensor analysis system in the Philippines: Contributions to the understanding of recent damaging earthquakes Reviewed

    Punongbayan, B. J. T., H. Kumagai, N. Pulido, J. D. Bonita, M. Nakano, T. Yamashina, Y. Maeda, H. Inoue, A. A. Melosantos, M. F. Figueroa, P. C. M. Alcones, K. V. C. Soriano, I. C. Narag, and R. U. Solidum Jr.

    J. Disast. Res.   Vol. 10   page: 18-24   2015.2

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  28. A phreatic explosion model inferred from a very long period seismic event at Mayon volcano, Philippines Reviewed

    Maeda, Y., H. Kumagai, R. Lacson, M. S. Figueroa II, T. Yamashina, T. Ohkura, and A. V. Baloloy

    J. Geophys. Res. Solid Earth   Vol. 120   2015

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/2014JB011440

  29. Shallow S wave attenuation and actively degassing magma beneath Taal Volcano, Philippines Reviewed

    Kumagai, H., R. Lacson Jr., Y. Maeda, M. S. Figueroa II, and T. Yamashina

    Geophys. Res. Lett.   Vol. 41   2014.9

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    DOI: doi:10.1002/2014GL061193

  30. Seismic moment and volume change of a spherical source Reviewed

    Kumagai, H., Y. Maeda, M. Ichihara, N. Kame, T. Kusakabe

    Earth Planets Space   Vol. 66   page: doi:10.1186/1880-5981-66-7   2014.4

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    DOI: doi:10.1186/1880-5981-66-7

  31. An analytical formula for the longitudinal resonance frequencies of a fluid-filled crack Reviewed

    Maeda, Y., and H. Kumagai

    Geophys. Res. Lett.   Vol. 40   page: doi:10.1002/grl.51002   2013.10

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    DOI: doi:10.1002/grl.51002

  32. Dynamic landslide processes revealed by broadband seismic records Reviewed

    Yamada, M., H. Kumagai, Y. Matsushi, and T. Matsuzawa

    Geophys. Res. Lett.   Vol. 40   page: doi:10.1002/grl.50437   2013.6

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    DOI: doi:10.1002/grl.50437

  33. Source process of long-period seismic events at Taal volcano, Philippines: Vapor transportation and condensation in a shallow hydrothermal fissure Reviewed

    Maeda, Y., H. Kumagai, R. Lacson, M. S. Figueroa II, and T. Yamashina

    J. Geophys. Res.   Vol. 118   page: doi:10.1002/jgrb.50205   2013.6

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    DOI: doi:10.1002/jgrb.50205

  34. Source amplitudes of volcano-seismic signals determined by the amplitude source location method as a quantitative measure of event size Reviewed

    Kumagai, H., R. Lacson, Y. Maeda, M. S. Figueroa II, T. Yamashina, M. Ruiz, P. Palaciose, H. Ortiz, and H. Yepes

    J. Volcanol. Geotherm. Res.   Vol. 257   page: 57-71   2013.3

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  35. Effects of water domains on seismic wavefields: A simulation case study at Taal volcano, Philippines Reviewed

    Maeda, Y. and H. Kumagai

    Earth Planets Space   Vol. 65   page: 85-96   2013.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.5047/eps.2012.07.004

  36. High-frequency source radiation during the 2011 Tohoku-Oki earthquake, Japan, inferred from KiK-net strong-motion seismograms Reviewed

    Kumagai, H., N. Pulido, E. Fukuyama, and S. Aoi

    J. Geophys. Res.   Vol. 116   page: doi:10.1029/2012JB009670   2013.1

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    DOI: doi:10.1029/2012JB009670

  37. Strong localized asperity of the 2011 Tohoku-Oki earthquake, Japan Reviewed

    Kumagai, H., N. Pulido, E. Fukuyama, and S. Aoi

    Earth Planets Space   Vol. 64   page: 649-654   2012.8

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    DOI: 10.5047/eps.2012.01.004

  38. Very low frequency earthquakes along the Ryukyu subduction zone Reviewed

    Ando, M., Y. Tu, H. Kumagai, Y. Yamanaka, and C. H. Lin

    Geophys. Res. Lett.   Vol. 39   page: L04303   2012.2

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    DOI: doi:10.1029/2011GL050559

  39. Rupture process and coseismic deformations of the 27 February 2010 Maule Earthquake, Chile Reviewed

    Pulido, N., Y. Yagi, H. Kumagai, and N. Nishimura

    Earth Planets Space   Vol. 63   page: 955–959   2011.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.5047/eps.2011.04.008

  40. Characterization of scattered seismic wavefields simulated in heterogeneous media with topography Reviewed

    Kumagai, H., T. Saito, G. O'Brien, and T. Yamashina

    J. Geophys. Res.   Vol. 116   page: B03308   2011.3

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    DOI: 10.1029/2010JB007718

  41. Ascending seismic source during an explosive eruption at Tungurahua volcano, Ecuador Reviewed

    Kumagai, H., P. Palacios, M. Ruiz, H. Yepes, and T. Kozono

    Geophys. Res. Lett.   Vol. 38   page: L01306   2011.1

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    DOI: 10.1029/2010GL045944

  42. Detection of landslides and submarine slumps using broadband seismic networks Reviewed

    Lin, C. H., H. Kumagai, M. Ando, and T. C. Shin

    Geophys. Res. Lett.   Vol. 37   page: L22309   2010.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2010GL044685

  43. Broadband seismic monitoring of active volcanoes using deterministic and stochastic approaches Reviewed

    Kumagai, H., M. Nakano, T. Maeda, H. Yepes, P. Palacios, M. Ruiz, S. Arrais, M. Vaca, I. Molina, and T. Yamashina

    J. Geophys. Res.   Vol. 115   page: B08302   2010.8

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    DOI: 10.1029/2009JB006889

  44. Centroid moment tensor catalogue for Indonesia Reviewed

    Nakano, M. , T. Yamashina, H. Kumagai, H. Inoue, and Snarjo

    Phys. Earth Plant. Inter.   Vol. 183   page: 456-467   2010.2

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  45. Source model of an earthquake doublet that occurred in a pull-apart basin along the Sumatran fault, Indonesia Reviewed

    Nakano, M., H. Kumagai, S. Toda, R. Ando, T. Yamashina, H. Inoue, and Snarjo

    Geophys. J. Int.   Vol. 181   page: 141-153   2010.2

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  46. Source mechanism of a very-long-period event at Mt Ontake, central Japan: Response of a hydrothermal system to magma intrusion beneath the summit Reviewed

    Nakamichi, H., H. Kumagai, M. Nakano, M. Okubo, F. Kimata, Y. Ito, and K. Obara

    J. Volcanol. Geotherm. Res.   Vol. 187   page: 167-177   2009.9

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  47. 火山性地震の発生過程―定量化に関する最近の成果― Invited Reviewed

    熊谷博之,中野優

    地震   Vol. 61   page: S379-S390   2009.7

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    Authorship:Lead author   Language:Japanese  

  48. Seismic tracking of lahars using tremor signals Reviewed

    Kumagai, H., P. Palacios, T. Maeda, D. Barba Castillo, and M. Nakano

    J. Volcanol. Geotherm. Res.   Vol. 183   page: 112-121   2009.3

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  49. Quantification of the sources of volcano-seismic signals Invited Reviewed

    Kumagai, H.

    Encyclopedia of Complexity and Systems Science     page: 9899-9932   2009.3

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    DOI: 10.1007/978-0-387-30440-3_583

  50. Waveform inversion in the frequency domain for the simultaneous determination of earthquake source mechanism and moment function Reviewed

    Nakano, M., H. Kumagai, and H. Inoue

    Geophys. J. Int.   Vol. 173   page: 1000-1011   2008.6

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  51. Source process of very-long-period events accompanying long-period signals at Cotopaxi Volcano, Ecuador Reviewed

    Molina, I., H. Kumagai, A. Garcia-Aristizabal, M. Nakano, and P. Mothes

    J. Volcanol. Geotherm. Res.   Vol. 176   page: 119-133   2007.8

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  52. Enhancing Volcano-Monitoring Capabilities in Ecuador Reviewed

    Kumagai, H., H. Yepes, M. Vaca, V. Caceres, T. Nagai, K. Yokoe, T. Imai, K. Miyakawa, T. Yamashina, S. Arrais, F. Vasconez, E. Pinajota, C. Cisneros, C. Ramos, M. Paredes, L. Gomezjurado, A. Garcia-Aristizabal, I. Molina, P. Ramon, M. Segovia, P. Palacios, L. Troncoso, A. Alvarado, J. Aguilar, J. Pozo, W. Enriquez, P. Mothes, M. Hall, I. Inoue, M. Nakano, and H. Inoue

    Eos trans. AGU   Vol. 88   page: 245-246   2007.6

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  53. Waveform inversion of volcano-seismic signals for an extended source Reviewed

    Nakano, M., H. Kumagai, B. Chouet, and P. Dawson

    J. Geophys. Res.   Vol. 112   page: B02306   2007.2

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    DOI: 10.1029/2006JB004490

  54. Seismic, petrologic, and geodetic analyses of the 1999 dome-forming eruption of Guagua Pichincha volcano, Ecuador Reviewed

    Garcia-Aristizabal, A., H. Kumagai, P. Samaniego, P. Mothes, H. Yepes, and M. Monzier

    J. Volcanol. Geotherm. Res.   Vol. 161   page: 333-351   2007.1

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  55. Source estimates of the May 2006 Java earthquake Reviewed

    Nakano, M., H. Kumagai, K. Miyakawa, T. Yamashina, H. Inoue, M. Ishida, S. Aoi, N. Morikawa, and Pri Harjadi

    Eos trans. AGU   Vol. 87   page: 493-494   2006.11

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  56. Temporal evolution of a magmatic dike system inferred from the complex frequencies of very-long-period seismic signals Reviewed

    Kumagai, H.

    J. Geophys. Res.   Vol. 111   page: B06201   2006.6

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    DOI: 10.1029/2005JB003881

  57. Vulucanian eruptions with dominant single force components observed at Asama volcano, Japan Reviewed

    Ohminato, T., M. Takeo, H. Kumagai, T. Yamashina, J. Oikawa, E. Koyama, H. Tsuji, and T. Urabe

    Earth Planets Space   Vol. 58   page: 583-593   2006.5

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  58. Response of a hydrothermal system to magmatic heat inferred from temporal variations in the complex frequencies of long-period events at Kusatsu-Shirane Volcano, Japan Reviewed

    Nakano, M. and H. Kumagai

    J. Volcanol. Geotherm. Res.   Vol. 147   page: 203-396   2005.10

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  59. Three-dimensional P-wave velocity structure of Tungurahua Volcano Reviewed

    Molina, I., H. Kumagai, J.-L. Le Pennec, and M. Hall

    J. Volcanol. Geotherm. Res.   Vol. 147   page: 144-156   2005.10

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  60. Waveform inversion of volcano-seismic signals assuming possible source geometries Reviewed

    Nakano, M. and H. Kumagai

    Geophys. Res. Lett   Vol. 32   page: L12302   2005.6

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    DOI: 10.1029/2005GL022666

  61. Source process of a long-period event at Kilauea Volcano Reviewed

    Kumagai, H., B.A. Chouet, and P.B. Dawson

    Geophys. J. Int.   Vol. 161   page: 243-254   2005.2

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  62. Resonances of a volcanic conduit triggered by repetitive injections of an ash-laden gas Reviewed

    Molina, I., H. Kumagai, and H. Yepes

    Geophys. Res. Lett.   Vol. 31   page: L03603   2004.2

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    DOI: 10.129/2003GL018934

  63. Source mechanism of long-period events at Kusatsu-Shirane Volcano, Japan, inferred from waveform inversion of the effective excitation functions Reviewed

    Nakano, M., H. Kumagai, and B.A. Chouet

    J. Volcanol. Geotherm. Res.   Vol. 122   page: 149-164   2003.4

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  64. Magmatic dike resonances inferred from very-long-period seismic signals Reviewed

    Kumagai, H., K. Miyakawa, H. Negishi, H. Inoue, K. Obara, and D. Suetsugu

    Science   Vol. 299   page: 2058-2061   2003.2

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1126/science.1081195

  65. Waveform inversion of oscillatory signatures in long-period events beneath volcanoes Reviewed

    Kumagai, H., B.A. Chouet, and M. Nakano

    J. Geophys. Res.   Vol. 107   page: 2301   2002.11

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2001JB001704

  66. Temporal evolution of a hydrothermal system in Kusatsu-Shirane Volcano, Japan, inferred from the complex frequencies of long-period events Reviewed

    Kumagai, H., B.A. Chouet, and M. Nakano

    J. Geophys. Res.   Vol. 107   page: 2236   2002.10

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    DOI: 10.1029/2001JB000653

  67. The dependence of acoustic properties of a crack on the resonance mode and geometry Reviewed

    Kumagai, H. and B.A. Chouet

    Geophys. Res. Lett.   Vol. 28   page: 3325-3328   2001.9

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  68. Tomographic inversion of P-wave velocity and Q structures beneath the Kirishima volcanic complex, southern Japan, based on the finite-difference calculations of the complex travel times Reviewed

    Tomatsu, T., H. Kumagai and P.B. Dawson

    Geophys. J. Int.   Vol. 146   page: 781-794   2001.9

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  69. Very-long-period seismic signals and the caldera formation at Miyake Island, Japan Reviewed

    Kumagai, H., T. Ohminato, M. Nakano, M. Ooi, A. Kubo, H. Inoue, and J. Oikawa

    Science   Vol. 293   page: 687-690   2001.7

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  70. Autoregressive modeling of transfer functions in frequency domain to determine complex travel times Reviewed

    Hasada, Y., H. Kumagai and M. Kumazawa

    Earth Planets Space   Vol. 53   page: 3-11   2001.1

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  71. Acoustic properties of a crack containing magmatic or hydrothermal fluids Reviewed

    Kumagai, H. and B.A. Chouet

    J. Geophys. Res.   Vol. 105   page: 25493-25512   2000.11

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  72. A self-organized model of earthquakes with constant stress drops and the b-value of 1 Reviewed

    Kumagai, H., Y. Fukao, S. Watanabe and Y. Baba

    Geophys. Res. Lett.   Vol. 26   page: 2817-2820   1999.9

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  73. 浜名湖周辺での東海沖の大地震に伴う津波堆積物の調査 Reviewed

    熊谷博之

    地学雑誌   Vol. 108   page: 424-432   1999.8

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  74. Evidence for slow slip following a moderate-size earthquake (Mw=5.7) in a subducting plate Reviewed

    Takai, K., H. Kumagai and N. Fujii

    Geophys. Res. Lett.   Vol. 26   page: 2113-2116   1999.7

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  75. The excitation and characteristic frequency of the long-period volcanic event: an approach based on an inhomogeneous AR model of a linear dynamic system Reviewed

    Nakano, M., H. Kumagai, M. Kumazawa, K. Yamaoka and B.A. Chouet

    J. Geophys. Res.   Vol. 103   page: 10031-10046   1999.5

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  76. The complex frequencies of long-period seismic events as probes of fluid compositions beneath volcanoes Reviewed

    Kumagai, H. and B.A. Chouet

    Geophys. J. Int.   Vol. 138   page: F7-F12   1999

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  77. 兵庫県南部地震(1995年1月17日)におけるGPS観測 Reviewed

    加藤照之,John Patrick L. Catane,茶珎俊一,藤森邦夫,平原和朗,平田安廣,細善信,市川隆一,井口博夫,伊勢崎修弘,岩淵哲也,笠原稔,木股文昭,小竹美子,久保篤規,熊谷博之,他14名

    測地学会誌   Vol. 43   page: 181-207   1997

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  78. 人工地震探査による霧島火山群の速度構造―波面法を用いた南北測線の初動走時データの解析― Reviewed

    戸松稔貴,熊谷博之,国友孝洋,山岡耕春,渡辺了

    火山   Vol. 42   page: 159-163   1997

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  79. Reconstruction of a Tertiary fossil forest from the Canadian High Arctic using three-dimensional computer graphics Reviewed

    Nobori, Y., K. Hayashi, H. Kumagai, S. Kojima, B. A. Lepage and T. Sweda

    J. For. Plann.   Vol. 3   page: 49-54   1997

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  80. 人工地震探査による霧島火山群の地震波速度構造―はぎとり法による解析― Reviewed

    筒井智樹,鍵山恒臣,三ヶ田均,森田裕一,松島健,井口正人,及川純,山岡耕春,熊谷博之,他60名

    火山   Vol. 41   page: 227-241   1996

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  81. Time sequence and the recurrence models for large earthquakes along the Nankai trough revisited Reviewed

    Kumagai, H.

    Geophys. Res. Lett.   Vol. 23   page: 1139-1142   1996

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  82. Post-seismic crustal deformation associated with the 1995 Hyogo-ken Nanbu Earthquake derived from GPS observation -Preliminary analysis of Trimble data- Reviewed

    Kato, T. Y. Kotake, S. Nakano, Y. Hirata, T. Chachin, F. Kimata, K. Yamaoka, T. Okuda, H. Kumagai, K. Hirahara, T. Nakano, T. Terashima, J.P.L. Catane, A. Kudo, T. Tabei, T. Iwabuchi and T. Matsushima

    J. Phys. Earth   Vol. 44   page: 287-299   1996

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  83. GPS observation of post-seismic crustal movements in the focal region of the 1995 Hyogo-ken Nanbu earthquake -Static and real-time kinematic GPS observations- Reviewed

    Hirahara K, T. Nakano, M. Kasahara, H. Takahashi, R.Ichikawa, S. Miura, T. Kato, S. Nakao, Y. Hirata, Y. Kotake, T. Chachin, F. Kimata, K. Yamaoka, T. Okuda, H. Kumagai, K. Nakamura, K. Fujimori, T. Yamamoto, T. Terashima, J.P.L. Catane, K. Tadokoro, A. Kudo, S. Otsuka, A. Tokuyama, T. Tabei, T. Iwabuchi and T. Matsushima

    J. Phys. Earth   Vol. 44   page: 301-315   1996

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  84. Growth-ring analysis of Early Tertiary conifer woods from the Canadian High Arctic and its paleoclimatic interpretation Reviewed

    Kumagai, H., T. Sweda, K. Hayashi, S. Kojima, J.F. Basinger, M.Shibuya and Y. Fukao

    Palaeo. Palaeo. Palaeo.   Vol. 116   page: 247-262   1995

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  85. Reply to the comment by Yamaguchi and Grissino-Mayer Reviewed

    Kumagai, H. and Y. Fukao

    Geophys. Res. Lett.   Vol. 20   page: 2281-2282   1993

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  86. Resolving volcanic activity of 20 Ma ago with relative accuracy of 1 yr from tree rings of petrified woods Reviewed

    Kumagai, H. and Y. Fukao

    Geophys. Res. Lett.   Vol. 19   page: 1859-1862   1992

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  87. Structure of the D" layer inferred from the Earth's free oscillations Reviewed

    Kumagai, H., Y. Fukao, N. Suda and N. Kobayashi

    Phys. Earth Plant. Inter.   Vol. 73   page: 38-52   1992

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▼display all

Books 1

  1. Source quantification of volcanic-seismic signals Reviewed

    Hiroyuki Kumagai( Role: Sole author)

    Springer  2022  ( ISBN:978-1-0716-1705-2

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    Responsible for pages:425-467   Language:English Book type:Scholarly book

    DOI: https://doi.org/10.1007/978-1-0716-1705-2_583

Presentations 54

  1. Estimation of vapor mass at the sources of long-period seismic events for risk assessment of phreatic eruption International conference

    Masayuki Nakano, Hiroyuki Kumagai

    Cities on Volcanoes 12  2024.2.12 

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    Event date: 2024.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:La Antigua   Country:Guatemala  

  2. 噴火微動・爆発地震の震源振幅関数の特徴と噴火過程の関係

    森亜津紗, 熊谷博之

    日本火山学会 2023 年度秋季大会  2023.10.19 

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    Event date: 2023.10

    Language:Japanese   Presentation type:Poster presentation  

    Venue:鹿児島市   Country:Japan  

  3. ⽉のクレータ斜⾯の微地形と岩⽯存在率分布から推定される熱疲労による⾵化と物質移動過

    池田あやめ, 熊谷博之, 諸田智克

    ⽇本惑星科学会2023年秋季講演会  2023.10.13 

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    Event date: 2023.10

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島市   Country:Japan  

  4. 月のクレータ斜面における熱疲労による岩塊の生成と破砕

    池田 あやめ, 熊谷 博之, 諸田 智克

    JpGU Meeting 2023  2023.5.26 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  5. Development of the rapid moment tensor estimation system for seismic monitoring in Thailand

    Mongkolchai Sukmee, Hiroyuki Kumagai

    JpGU Meeting 2023  2022.5.21 

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    Event date: 2023.5

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  6. Relationship of very long period events and tremor to eruption processes at Nevado del Ruiz volcano, Colombia International coauthorship

    Yuki Hattori, Hiroyuki Kumagai, Masayuki Nakano, Yuta Maeda, John Londoño

    JpGU Meeting 2023  2023.5.23 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Poster presentation  

    Country:Japan  

  7. 火山性低周波地震の震源特性の時間変化とマグマ脱ガス活動との関係

    中野 誠之, 熊谷 博之

    JpGU Meeting 2023  2023.5.22 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  8. Production Processes of Boulders and Regolith on Lunar Crater Slopes Inferred from Topographic Feature and Rock Abundance International conference

    Ayame Ikeda, Hiroyuki Kumagai, Tomokatsu Morota

    LPSC 2023  2023.3.16  LPSC

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    Event date: 2023.3

    Language:Japanese   Presentation type:Poster presentation  

    Venue:Woodlands   Country:United States  

  9. Inversion of envelope widths of volcano-seismic events for scattering and attenuation structures beneath at volcanoes International conference

    Hiroyuki Kumagai, Miki Hamamoto

    IAVCEI 2023 Scientific Assembly  IAVCEI

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    Event date: 2023.1 - 2023.2

    Language:English   Presentation type:Poster presentation  

    Venue:Rotorua   Country:New Zealand  

  10. Temporal changes in scattering and attenuation characteristics at Taal volcano, Philippines, estimated by inversion of envelope widths of volcano-tectonic earthquakes International coauthorship International conference

    Miki Hamamoto, Hiroyuki Kumagai, Rudy Lacson, Ma. Antonia V. Bornas, Renato Solidum

    IAVCEI 2023 Scientific Assembly  IAVCEI

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    Event date: 2023.1 - 2023.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Rotorua   Country:New Zealand  

  11. 草津白根山で発生する火山性低周波地震の振動周波数とマグマの脱ガス活動との関係

    中野誠之, 熊谷博之

    日本火山学会 2022 年度秋季大会  2022.10.13  日本火山学会

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    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三島市   Country:Japan  

  12. 噴火微動と爆発地震から推定される噴出量と継続時間のスケーリング関係

    森 亜津紗, 熊谷博之

    日本火山学会 2022 年度秋季大会  2022.10.13  日本火山学会

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    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

  13. 噴火微動の高周波地震波の形状特性に基づいた噴火規模および継続時間の関係

    森 亜津紗, 熊谷 博之

    JpGU Meeting 2022  2022.6.2  JpGU

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    Event date: 2022.5 - 2022.6

    Language:Japanese   Presentation type:Poster presentation  

    Venue:オンライン   Country:Japan  

  14. 伊豆大島火山の浅部3D地震波速度構造: 1999年伊豆大島探査で得られた走時データ解析

    田中 聡, 及川 純, 渡辺 秀文, 熊谷 博之, 松島 健, 藤原 健治

    JpGU Meeting 2022  2022.5.25  JpGU

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    Event date: 2022.5

    Language:Japanese  

    Venue:千葉市   Country:Japan  

  15. 火山構造性地震のエンベロープ幅を用いた逆問題解析手法(2):散乱・非弾性減衰の時間変動推定

    濱本未希, 熊谷 博之

    JpGU Meeting 2022  2022.5.23  JpGU

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    Event date: 2022.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  16. 火山性地震のエンベロープ幅を用いた逆問題解析(1):空間重み関数を用いた散乱・非弾性減衰の空間分布推定

    熊谷 博之, 濱本未希

    JpGU Meeting 2022  2022.5.23  JpGU

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    Event date: 2022.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  17. 火山性低周波地震の波形インバージョンから推定される地震モーメントの時間変動と頻度分布の特徴

    中野 誠之, 熊谷 博之, 田口 貴美子

    JpGU Meeting 2022  2022.5.25  JpGU

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    Event date: 2022.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  18. クラックモデルと地震モーメントから推定される火山性低周波地震の震源特性とスケーリング関係

    田口 貴美子, 熊谷 博之, 中野 誠之

    JpGU Meeting 2022  2022.5.25  JpGU

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    Event date: 2022.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  19. Boulder Falls Triggered by Small Impacts on Lunar Crater Slopes International conference

    Ayame Ikeda, Hiroyuki Kumagai, Tomokatsu Morota

    AGU 2021 Fall Meeting  2021.12  AGU

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    Event date: 2021.12

    Language:English   Presentation type:Poster presentation  

    Venue:Online   Country:United States  

  20. Mapping Envelope Widths of Volcano-Seismic Events Using Space-Weighting Functions to Estimate 3D Scattering and Attenuation Structures at Volcanoes International conference

    Hiroyuki Kumagai, Miki Hamamoto

    AGU 2021 Fall Meeting  2021.12  AGU

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    Event date: 2021.12

    Language:English   Presentation type:Poster presentation  

    Venue:Online   Country:United States  

  21. Crack Source Estimation for Long-Period Events Using Low-Frequency Seismic Amplitudes: Application at Kusatsu-Shirane Volcano, Japan

    Masayuki Nakano, Hiroyuki Kumagai

    AGU 2021 Fall Meeting  2021.12  AGU

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    Event date: 2021.12

    Language:English   Presentation type:Poster presentation  

    Venue:Online   Country:United States  

  22. Large fluctuations of seismic scattering properties in a magmatic conduit before the 2020 eruptions at Taal volcano (Philippines) inferred from inversion of envelope widths of volcano-tectonic earthquakes International coauthorship International conference

    Miki Hamamoto, Hiroyuki Kumagai, Rudy Lacson, Jr., Mariton Bornas, Renato Solidum

    AGU 2021 Fall Meeting  2021.12  AGU

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    Event date: 2021.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:United States  

  23. 地震波振幅を用いた震源位置とメカニズムの推定法:草津白根山における低周波地震への適用

    中野誠之, 熊谷博之

    日本火山学会 2021 年度秋季大会  2021.10  日本火山学会

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    Event date: 2021.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  24. 月のボルダー崩れから推定されるクレータ斜面の物質移動過程

    池田あやめ, 熊谷博之, 諸田智克

    JpGU Meeting 2021  2021.6  JpGU

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    Event date: 2021.5 - 2021.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  25. 火山性低周波地震の振動波形を用いた震源クラックと火山体構造不均質性の推定:草津白根山への適用

    中野誠之, 熊谷博之

    JpGU Meeting 2021  2021.6  JpGU

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    Event date: 2021.5 - 2021.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  26. 火山構造性地震のエンベロープ幅の逆問題解析によるタール火山の散乱構造とその時間変化の推定

    濱本未希, 熊谷 博之, Lacson Rudy

    JpGU Meeting 2021  2021.6  JpGU

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    Event date: 2021.5 - 2021.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  27. Excitation of Long-period (LP) Events at Galeras Volcano, Colombia, Inferred from Crack Model Simulations International coauthorship International conference

    Kimiko Taguchi, Hiroyuki Kumagai, Yuta Maeda, Roberto Armando Torres

    2020.12  AGU

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    Event date: 2020.12

    Language:English   Presentation type:Poster presentation  

    Venue:Online   Country:United States  

  28. Seismic scattering anomalies at Taal volcano, Philippines, inferred from inversion of envelope widths of volcano-seismic events International conference

    Miki Hamamoto, Hiroyuki Kumagai

    AGU 2020 Fall Meeting  2020.12  AGU

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    Event date: 2020.12

    Language:English   Presentation type:Poster presentation  

    Venue:Online   Country:United States  

  29. クラック固有振動の数値計算に基づくガレラス山(コロンビア)での低周波地震の励起過程推定 International coauthorship

    田口貴美子, 熊谷博之, 前田裕太, Roberto Torres

    日本火山学会 2020 年度秋季大会  2020.10  日本火山学会

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    Event date: 2020.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  30. ガレラス火山(コロンビア)における低周波地震の発生過程:減衰調和振動型(N型)と非調和振動型(B型)の違いについて International coauthorship

    熊谷博之, ロベルト・トレス

    日本火山学会 2020 年度秋季大会  2020.10 

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    Event date: 2020.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  31. 草津白根山で発生したLPイベントの発生過程:水蒸気の凝縮に伴うクラック体積の減少と固有振動の励起

    田口貴美子, 熊谷博之, 前田裕太

    JpGU-AGU Joint Meeting  2020.7  JpGu-AGU

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    Event date: 2020.7

    Language:Japanese   Presentation type:Poster presentation  

    Venue:オンライン   Country:Japan  

  32. 自然および人工地震のエンベロープ幅から推定される火山の散乱および減衰構造 International coauthorship

    熊谷 博之, トレス ロベルト, 前田 裕太

    JpGU-AGU Joint Meeting  2020.7  JpGU-AGU

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    Event date: 2020.7

    Language:Japanese   Presentation type:Poster presentation  

    Venue:オンライン   Country:Japan  

  33. 火山性地震のエンベロープ幅の逆問題解析を用いたタール火山の3次元散乱構造の推定

    濱本未希, 熊谷博之

    JpGU-AGU Joint Meeting  2020.7  JpGU-AGU

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    Event date: 2020.7

    Language:Japanese   Presentation type:Poster presentation  

    Venue:オンライン   Country:Japan  

  34. 月面上の舌状衝上断層付近におけるボルダー崩れの成因の解明:最大加速度の距離減衰式に基づく震源の推定

    池田あやめ, 熊谷博之, 諸田智克

    JpGU-AGU Joint Meeting  2020.7  JpGU-AGU

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    Event date: 2020.7

    Language:Japanese   Presentation type:Poster presentation  

    Venue:オンライン   Country:Japan  

  35. Repeating Earthquakes along the Colombian Subduction Zone International conference

    Juan Carlos Bermudez-Barrios, Hiroyuki Kumagai

    AGU Fall Meeting 2019 

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    Event date: 2019.12

    Language:English   Presentation type:Poster presentation  

    Venue:San Francisco   Country:United States  

  36. Empirical Relation for the Quality Factors of Crack Resonances and Its Application to Estimate Source Properties of Volcanic Long-period Seismic Events International conference

    Kimiko Taguchi, Hiroyuki Kumagai, Yuta Maeda, Roberto Armando Torres

    AGU Fall Meeting 2019 

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    Event date: 2019.12

    Language:English   Presentation type:Poster presentation  

    Venue:San Francisco   Country:United States  

  37. Very Long Period Seismicity Preceding and During the 2015 Eruptions at Cotopaxi Volcano, Ecuador International conference

    Indira Molina, Hiroyuki Kumagai, Mario Calixto Ruiz, Gabriela Arias

    AGU Fall Meeting 2019 

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    Event date: 2019.12

    Language:English   Presentation type:Poster presentation  

    Country:United States  

  38. High-frequency seismic source amplitude of eruption tremor and its relations to plume heights, volumes, and durations of Plinian eruptions International conference

    Azusa Mori, Hiroyuki Kumagai

    AGU Fall Meeting 2019 

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    Event date: 2019.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:San Francisco   Country:United States  

  39. Amplitude source location method with depth-dependent scattering and attenuation structures: application at Nevado del Ruiz volcano, Colombia International conference

    Hiroyuki Kumagai, John Makario Londono, Yuta Maeda, Alvaro Esteban Acevedo

    AGU Fall Meeting 2019 

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    Event date: 2019.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:San Francisco   Country:United States  

  40. 噴火微動の継続時間と噴出量の関係

    森 亜津紗, 熊谷 博之

    日本地球惑星科学連合2019年大会 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:幕張メッセ   Country:Japan  

  41. 火山の散乱特性の深さ依存性を考慮したASL法による火山性地震・微動の震源推定

    熊谷 博之, John Makario Lonodno, Alvaro Esteban Acevedo Rivas, 前田 裕太

    日本地球惑星科学連合2019年大会 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  42. クラック固有振動のQ値と形状・流体特性の関係:経験則の導出と火山性LPイベント解析への応用

    田口 貴美子, 熊谷 博之, 前田 裕太, Torres Roberto

    日本地球惑星科学連合2019年大会 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  43. Relation Between High-frequency Seismic Source Amplitudes of Eruption Tremors and Eruption Volume Flux International conference

    Azusa Mori, Hiroyuki Kumagai, John Makario Londono, Beatriz Galvis

    AGU Fall Meeting 2018 

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    Event date: 2018.12

    Language:English   Presentation type:Poster presentation  

    Venue:Washington DC   Country:United States  

  44. Characterization of the Envelope Widths of Volcano-seismic Events and Their Use to Investigate Scattering Structures Beneath Volcanoes International conference

    Hiroyuki Kumagai, John Makario Londono, Yuta Maeda, Cristian M Lopez, Rudy Lacson

    AGU Fall Meeting 2018 

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    Event date: 2018.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Washington DC   Country:United States  

  45. Tsunami source of the 1906 Ecuador-Colombia earthquake revisited International conference

    Masahiro Yoshimoto, Hiroyuki Kumagai

    AGU Fall Meeting 2018 

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    Event date: 2018.12

    Language:English   Presentation type:Poster presentation  

    Venue:Washington DC   Country:United States  

  46. Temporal Variations in Seismic Scattering Characteristics in a Shallow S-wave Attenuation Region at Taal Volcano, Philippines International conference

    Miho Niino, Hiroyuki Kumagai

    AGU Fall Meeting 2018 

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    Event date: 2018.12

    Language:English   Presentation type:Poster presentation  

    Venue:Washington DC   Country:United States  

  47. Triggering Processes of Long-period Seismic Events beneath Volcanoes: Vapor Condensation and Magma Fragmentation in Shallow Cracks International conference

    Kimiko Taguchi, Hiroyuki Kumagai, Yuta Maeda, Roberto Armando Torres

    AGU Fall Meeting 2018 

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    Event date: 2018.12

    Language:English   Presentation type:Poster presentation  

    Venue:Washington DC   Country:United States  

  48. Temporal Variation of Seismic Wave Attenuation Associated with the Activity of Nevado del Ruiz Volcano, Colombia, 2010-2018 International conference

    John Makario Londono, Hiroyuki Kumagai

    AGU Fall Meeting 2018 

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    Event date: 2018.12

    Language:English   Presentation type:Poster presentation  

    Venue:Washington DC   Country:United States  

  49. コロンビアとエクアドルにおける自動CMT解および津波波高推定システムの導入と運用

    熊谷博之, 吉本昌弘, V. Dionicio, 前田裕太, W. Acero, G.Ponce, J.C. Bermudez, O. Chamorro

    地震学会秋季大会 

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    Event date: 2018.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:郡山市   Country:Japan  

  50. 1906年エクアドル・コロンビア地震の津波波源の再検討

    吉本昌弘, 熊谷博之

    地震学会秋季大会 

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    Event date: 2018.10

    Language:Japanese   Presentation type:Poster presentation  

    Venue:郡山市   Country:Japan  

  51. タール火山(フィリピン)における地震波散乱特性の時空間分布とマグマ活動との関係

    新納 美穂, 熊谷 博之

    日本地球惑星科学連合2018年大会  

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    Event date: 2018.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  52. 火山性地震のエンベロープ幅から推定される火山の散乱特性の深さ分布

    熊谷 博之, ロンドニョ ジョン, 前田 裕太, ロペス クリスチャン, ラクソン ルディー

    日本地球惑星科学連合2018年大会  

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    Event date: 2018.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  53. クラックモデルに基づく周波数解析から推定されるLPイベントの励起過程

    田口 貴美子, 熊谷 博之1、前田 裕太1、Torres Roberto2

    日本地球惑星科学連合2018年大会  

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    Event date: 2018.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

  54. 高周波地震波の震源振幅に基づく噴煙高度推定システムの開発 International conference

    森 亜津紗, 熊谷 博之, Galvis Beatriz, Londono John

    日本地球惑星科学連合2018年大会  

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    Event date: 2018.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉市   Country:Japan  

▼display all

Research Project for Joint Research, Competitive Funding, etc. 2

  1. コロンビアにおける地震・津波・火山監視情報の高度化と地震発生ポテンシャル評価

    2014.5

    地球規模課題対応国際科学技術研究プログラム  

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    Grant type:Competitive

  2. フィリピンにおけるリアルタイム総合火山監視および高度即時震源解析

    2013.4 - 2015.3

    地球規模課題対応国際科学技術研究プログラム 

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    Grant type:Competitive

KAKENHI (Grants-in-Aid for Scientific Research) 3

  1. Understanding the magma system at Taal volcano, Philippines, based on in-situ geophysical observations

    Grant number:19KK0084  2019.10 - 2023.3

    Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

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    Authorship:Principal investigator 

    Grant amount:\18330000 ( Direct Cost: \14100000 、 Indirect Cost:\4230000 )

  2. 機械学習に基づくスロー地震および噴火シグナル検知手法の開発

    Grant number:19K04050  2019.4 - 2022.3

    中野 優

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    Authorship:Coinvestigator(s) 

    地震発生帯や火山では、様々な地動シグナルの観測から、震源断層やマグマ溜まりで起きている現象を解明するための研究が行われている。近年の研究により、地震発生帯におけるスロー地震の発見と巨大地震に先行するイベントの存在から「非火山性微動」モニタの重要性が、火山地域では噴火に伴う「火山性微動」モニタの重要性が指摘されている。本研究ではこれらのシグナル判別、分類の手法として、機械学習(MLM)によるシグナルの自動認識に着目する。本研究ではMLMによる、効果的なシグナルの判別手法の開発を行い、微動シグナルのモニタ能力とその発生源である自然現象の監視能力の向上を図る。
    本計画の目的は、地震発生帯や火山で観測される様々な地動シグナルのうち、巨大地震の準備過程や火山噴火に伴う特徴的なシグナルを判別する手法を開発し、これらのモニタ能力を向上することにある。巨大地震の準備過程に関連するシグナルとして、プレート境界のゆっくりとしたすべりによって発生する「非火山性微動」が、火山では噴火に伴う特徴的な「火山性微動」が発生する。これらの複雑なシグナルを自動で識別するために、本研究では機械学習を用いる。精度の良い判別手法を構築するには、機械学習で用いるニューラルネットを訓練するためのなるべく多くの学習用データを用意する必要があるが、これまでの研究では約200イベントによる数千のデータで行っていたため、連続した観測データに適用した場合の判別精度は十分ではなかった。「火山性微動」に関しては今年度新たに取り組むため、新規にカタログを用意する必要がある。そこで今年度は「非火山性微動」については新たな検出法を用いて学習用データを増やし、「火山性微動」については噴火イベントの記録を用いて複数の火山でのカタログを作成する事とした。
    「非火山性微動」について、これまでは大きなサイズのイベントに伴う超低周波地震のカタログを用いていたが、今年度は地震波エネルギーに基づくイベントの検出によって小さいイベントを含むカタログを作成した。このプロセスにおいて、通常の地震やノイズの除去を目視によって行い、これに時間を要したため、本年度はカタログの作成にとどまった。しかし、新カタログではイベントの数がこれまでの約200から数千と、約十倍に増えた。「火山性微動」については、日本及びコロンビアの火山における噴火記録を用い、噴火にともなうイベントに関してのカタログ作成を行った。これにより、今後開発する手法での判別精度の向上が期待できる。
    当初計画では、シグナル識別の汎用性と精度を高めるための手法の改良として、既存データに疑似的なノイズを加えることを計画していた。しかし、機械学習によるシグナル判別の汎用性を高めるためには学習データの数を多く、またバリエーションを増やす必要がある。これまでは比較的大きな非火山性微動のシグナルを用いていたが、より小さいイベントを学習データに加えた方が、シグナル判別の汎用性を高められると考え、地震波エネルギー推定に基づく手法によって新しく非火山性微動のカタログを作成することとした。学習データの作成においては、通常地震などの非火山性微動ではない「ノイズ」を目視で取り除く必要があり、これに時間を要したため本年度は学習データのためのカタログ作成までの達成となり、判別モデルの改良まで行うことは出来なかった。噴火に伴う火山性微動のカタログ作成については計画通りである。
    今後は新しく作成した学習データを用い、これまでに開発した、ランニングスペクトルを用いたシグナル判別手法であるSRSpec-CNNの改良を行う。さらに、ランニングスペクトルの作成には計算コストが高いため、これを簡略化するための新しいスキームの導入も試みる。これらを用い、また機械学習のニューラルネットワークに最新の手法を導入するなどして判別精度の向上を試みる。改良した手法を連続波形記録に適用し、判別精度の評価を行う。さらに、疑似ノイズを混入することによる、ノイズ耐性の強い判別システムの構築を行う。新しく構築した手法を非火山性微動および火山性のシグナルに適用し、判別精度の評価とこれらの得意なシグナルの検出率の向上を行う。
    次に、より分解能の高い時間-周波数系列データの入力によって、シグナル識別の汎用性を高める。分解能を上げると計算負荷が爆発的に増加するので、適宜間引く等、最も効率的なパラメータの探索も行う。スペクトル以外の観測量(シグナルの分散、歪度、尖度、観測点間の相関、振幅分布等)の入力も検討する。同時に、クラスタリング手法によって、シグナルを特徴づける観測量の関連を調べる。このプロセスは、震源におけるプロセスの理解と判別がうまくいかないときの修正方針を立てるのに役立つ。

  3. Elucidation of magmatic and hydrothermal systems of the highly eruptive Taal and Mayon volcanoes

    Grant number:16H05651  2016.4 - 2019.3

    Nagao Toshiyasu

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    Authorship:Coinvestigator(s) 

    We conducted multidisciplinary research on Taal Volcano and Mayon Volcano in the Philippines and carried out comprehensive observation and analysis in the fields of seismology, electromagnetics, geodesy, and geochemistry, in particular, for Taal Volcano.
    As a result, we found that there was a large hydrothermal reservoir or a magma reservoir in the shallow part of Taal Volcano. In addition, from the observation of volcanic gas at multiple sites, it was found that the chemical composition of the gas is changing in coordination.
    In the Philippines, there is no expert of gravity survey which was performed in the 1990s. Therefore, gravity measurement was carried out at Taal Volcano and a gravity reference point was re-established. In electromagnetic observation, we succeeded in confirming the apparent resistivity change associated with the swarm activity.

 

Teaching Experience (On-campus) 4

  1. 地震学

    2018

  2. 火山活動論

    2018

  3. 基礎セミナーA

    2018

  4. 地球内部物性論

    2018

 

Social Contribution 1

  1. 世界で起こったすごい噴火

    Role(s):Lecturer

    日本火山学会  日本火山学会 2020年 一般講演会  2020.10