Faculty Profiles - ITO Takeo

Papers - ITO Takeo

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Probing asthenospheric density, temperature and elastic moduli below the Western United States Reviewed

T. Ito and M. Simons

Science Vol. 322 ( 6032 ) page： 947-951 2011.4

Physics-informed deep learning approach for modeling crustal deformation

Okazaki, T; Ito, T; Hirahara, K; Ueda, N

NATURE COMMUNICATIONS Vol. 13 ( 1 ) 2022.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Nature Communications

The movement and deformation of the Earth’s crust and upper mantle provide critical insights into the evolution of earthquake processes and future earthquake potentials. Crustal deformation can be modeled by dislocation models that represent earthquake faults in the crust as defects in a continuum medium. In this study, we propose a physics-informed deep learning approach to model crustal deformation due to earthquakes. Neural networks can represent continuous displacement fields in arbitrary geometrical structures and mechanical properties of rocks by incorporating governing equations and boundary conditions into a loss function. The polar coordinate system is introduced to accurately model the displacement discontinuity on a fault as a boundary condition. We illustrate the validity and usefulness of this approach through example problems with strike-slip faults. This approach has a potential advantage over conventional approaches in that it could be straightforwardly extended to high dimensional, anelastic, nonlinear, and inverse problems.

DOI： 10.1038/s41467-022-34922-1

Web of Science

Scopus

PubMed

Asthenosphere rheology inferred from observations of the 2012 Indian Ocean earthquake Reviewed

Yan Hu, Roland Bürgmann, Paramesh Banerjee, Lujia Feng, Emma M. Hill, Takeo Ito, Takao Tabei, and Kelin Wang

Nature 2016.10

Complex rupture during the 12 January 2010 Haiti Earthquake Reviewed

R. Briggs, A. Sladen, E. Fielding, C. Prentice, K. Hudnut, P. Mann, F. Taylor, A. Crone, R. Gold, T. Ito and M. Simons

Nature Geoscience 2010.5

Temporary slip speed increases during short-term slow slip events with durations of one to three hours Reviewed

Earth, Planets and Space Vol. 76 ( 45 ) 2024.3

Evaluation of earthquake potential using a kinematic crustal block motion model in Java, Indonesia, based on GNSS observation Reviewed International coauthorship

R. Raharja, T. Ito, I. Meilano

Journal of Asian Earth Sciences: X Vol. 1 2024.1

Present-day land subsidence over Semarang revealed by time series InSAR new small baseline subset technique

Aditiya A., Ito T.

International Journal of Applied Earth Observation and Geoinformation Vol. 125 2023.12

Publisher：International Journal of Applied Earth Observation and Geoinformation

Over the last two decades, Semarang, located in the central region of Java island, Indonesia, has been undergoing significant land subsidence. Mainly attributed to reservoir compaction and fluid extraction, this subsidence has pronounced effects in coastal regions. However, the existing study on the details of subsidence and its application to accurately depict present circumstances has been insufficient. Utilizing the new small baseline subset technique and C-band SAR data from 2015 to 2022, this study delineates the spatial boundaries of land subsidence in Semarang and surrounding areas. Atmospheric effects were mitigated using the GACOS model during InSAR processing. The study reveals dominant vertical movements in Semarang's north coastal area, characterized by rapid and extensive changes. In contrast, horizontal movement shows relatively small changes in number to the east of the study area. Time series analysis indicates maximum subsidence rate of 100–120 mm/year in the northern and eastern part of Semarang and Demak. Available data from GNSS stations ensures the reliability of these findings. The correlation coefficient of 0.86 indicated substantial association between groundwater and deformation. Approximately 20 % of Semarang's land area is affected by land subsidence, which is notably more prevalent in alluvial soils and densely populated regions. In Demak, subsidence is primarily observed in agricultural regions, whereas in Kendal, the 50 mm/year subsidence rate represents a growing concern. This accelerating phenomenon poses substantial risks to the local environment and economic sectors. All authorities must harmonize regulations to force their roles, produce details spatial plan maps, and establish mitigation and adaptation infrastructure to handle the current crisis realistically.

DOI： 10.1016/j.jag.2023.103579

Scopus

Time Series InSAR Analysis over Jakarta Metropolitan Area Invited Reviewed International coauthorship

Agustan, Takeo Ito, Estu Kriswati, Hari Priyadi, Heri Sadmono, Rika Hernawati

2022 IEEE Asia-Pacific Conference on Geoscience, Electronics and Remote Sensing Technology 2023.4

Time Series InSAR for Ground Deformation Observation in Semarang Area, Central Java Reviewed

APSAR 2023 - 2023 8th Asia-Pacific Conference on Synthetic Aperture Radar 2023

Language：English Publishing type：Research paper (international conference proceedings) Publisher：APSAR 2023 - 2023 8th Asia-Pacific Conference on Synthetic Aperture Radar

The initiatives of open data and open platforms, combined with on-demand data processing in Synthetic Aperture Radar (SAR), enable more straightforward and accessible ground deformation research worldwide. The Alaska Satellite Facility Distributed Active Archive Center (ASF DAAC) provides high-quality interferogram combination pairs based on the Small Baseline Subset (SBAS) technique and on-demand InSAR data analysis known as HyP3. HyP3 offers unwrapped phase data from Sentinel-1 satellites and other derived products that can be utilized with open-source deformation software such as Mintpy. This research aims to assess the quality of interferogram combination pairs by configuring networks of perpendicular and temporal baselines for observing ground deformation in Semarang, Central Java, Indonesia. The study demonstrates that HyP3 products enable time series analysis to determine deformation rates. Over 8.4 years, from November 15th, 2014, to April 14th, 2023, the Simpang Lima landmark in Semarang experienced an approximate subsidence rate of -0.87 cm/year. However, the maximum subsidence rate of approximately 11 cm/year was observed in the southeastern part of Semarang.

DOI： 10.1109/APSAR58496.2023.10388980

Scopus

Machine-learning-based detection of volcano seismicity using the spatial pattern of amplitudes Reviewed

Y. Maeda,Y. Yamanaka, T. Ito, S. Horikawa

Geophysical Journal International Vol. 225 ( 1 ) page： 416 - 444 2021.4

Land Subsidence Rate of Jakarta Metropolitan Area Observed By Stacking Sentinel-1 Data

Agustan, A; Kriswati, E; Ito, T; Abdullah, FM; Anantasena, Y; Nugroho, D

2021 IEEE ASIA-PACIFIC CONFERENCE ON GEOSCIENCE, ELECTRONICS AND REMOTE SENSING TECHNOLOGY (AGERS-2021) page： 69 - 72 2021

Publisher：2021 IEEE Asia-Pacific Conference on Geoscience, Electronics and Remote Sensing Technology, AGERS 2021 - Proceeding

The growth of Jakarta metropolitan area as capital city is increase from time to time. Even the rate of population growth tends to decline, but population still stresses Jakarta environment. The surface changes and ground deformation related to city growth can be observed continuously by satellite-based remote sensing. The launch of Sentinel-1 satellite with radar mission through Copernicus, which is a joint initiative of the European Commission and European Space Agency, enables continuous observation of earth's surface. This paper describes a study of ground deformation rate of Jakarta metropolitan area observed by processing Sentinel-1 data based on interferometric Synthetic Aperture Radar method. Only small perpendicular baselines of SAR data pairs are selected from 2015 to 2019 to avoid the use of external Digital Elevation Model data. The land subsidence rate is obtained by stacking the unwrapped phase and it is found that the rate is different across the region. In the western part, the rate is around -2cm/year whereas in the eastern part is around -3cm/year. The pattern and the rate of land subsidence are confirmed by ascending and descending orbit direction.

DOI： 10.1109/AGERS53903.2021.9617239

Web of Science

Scopus

Urgent Joint Seismic Observation Data of the 2016 Kumamoto Earthquakes

SHITO Azusa, MITSUOKA Ayaho, MATSUMOTO Satoshi, MATSUSHIMA Takeshi, AIZAWA Koki, SHIMIZU Hiroshi, UCHIDA Kazunari, KAMIZONO Megumi, TEGURI Yoshiko, NAKAMOTO Manami, MIYAMACHI Rintaro, ICHIYANAGI Masayoshi, OHZONO Mako, OKADA Kazumi, KATSUMATA Kei, TAKADA Masamitsu, TAKAHASHI Hiroaki, TANIOKA Yuichiro, YAMAGUCHI Teruhiro, KOSUGA Masahiro, AZUMA Ryosuke, UCHIDA Naoki, EMOTO Kentaro, OHTA Yusaku, OKADA Tomomi, KAIDA Toshiki, KOZONO Tomofumi, SUZUKI Syuichi, TAKAGI Ryota, DEMACHI Tomotsugu, NAKAHARA Hisashi, NAKAYAMA Takashi, HIRAHARA Satoshi, MATSUZAWA Toru, MIURA Satoshi, YAMAMOTO Mare, IMANISHI Kazutoshi, UCHIDE Takahiko, YOSHIMI Masayuki, AOI Shin, ASANO Youichi, UENO Tomotake, FUJITA Eisuke, ABE Eiji, IIDAKA Takashi, IWASAKI Takaya, KATO Aitaro, KURASHIMO Eiji, SAKAI Shin’ichi, SHIINA Takahiro, SERIZAWA Masato, TANAKA Shinichi, NAKAGAWA Shigeki, HIRATA Naoshi, MASUDA Masataka, MIYAKAWA Koji, YAGI Takeo, WATANABE Atsushi, GOTO Kazuhiko, ITO Takeo, OKUDA Takashi, TERAKAWA Toshiko, HORIKAWA Shinichiro, MAEDA Yuta, MATSUHIRO Kenjiro, YAMANAKA Yoshiko, WATANABE Toshiki, IIO Yoshihisa, KATAO Hiroshi, KANO Yasuyuki, TSUDA Hiroo, MIURA Tsutomu, MURAMOTO Tomoya, YAMASHITA Yusuke, OKUBO Makoto, YAMASHINA Tadashi, OHKURA Takahiro, NAKAO Shigeru, HIRANO Shuichiro, MIYAMACHI Hiroki, YAKIWARA Hiroshi

Zisin (Journal of the Seismological Society of Japan. 2nd ser.) Vol. 73 ( 0 ) page： 149 - 157 2020.10

Earthquake potential in Costa Rica using three scenarios for the Central Costa Rica Deformed Belt as western boundary of the Panama Microplate Reviewed

Luis Alejandro Carvajal Soto, T. Ito, M. Protti, H. Kimura

Journal of South American Earth Sciences Vol. 97 page： 102375 2020.1

Ground Deformation Identification related to 2018 Lombok Earthquake Series based on Sentinel-1 Data Reviewed

Agustan, Rahma, N. Hanifa, Yudi Anantasena, M. Sadly, Takeo Ito

The 4th International Conference of Indonesian Society for Remote Sensing Vol. 280 ( 1 ) 2019.8

Interplate Coupling Distribution along the Nankai Trough in Southwest Japan estimated from the Block Motion Model based on Onshore GNSS and Seafloor GNSS/A Observations Reviewed

H. Kimura, K. Tadokoro and T.Ito

Journal of Geophysical Research Vol. 124 ( 6 ) page： 6140 - 6164 2019.6

Evaluation of the 2012 Indian Ocean coseismic fault model in 3-D heterogeneous structure based on vertical and horizontal GNSS observation, Reviewed

C. Pratama, T. Ito, T. Tabei, F. Kimata, E. Gunawan, Y. Ohta, T. Yamashina, I. Nurding, D. Sugiyanto, U. Muksin, N. Ismail, I. Meilano

AIP Conference Proceedings Vol. 1987 ( 1987 ) page： 020011 2018.7

Spatio-temporal afterslip distribution following the 2011 Tohoku-Oki earthquake using 3D viscoelastic Green's functions Reviewed

T. Ito, S. Suzuki, K. Kachishige, M. Hyodo

AIP Conference Proceedings Vol. 1987 ( 1987 ) page： 020056 2018.7

Coseismic Slip Distribution of the 2 July 2013 Mw 6.1 Aceh, Indonesia, Earthquake and Its Tectonic Implications Reviewed

Endra Gunawan, Sri Widiyantoro, Shindy Rosalia, Mudrik Rahmawan, Daryono, Irwan Meilano, Pepen Supendi, Takeo Ito, Takao Tabei, Fumiaki Kimata, Yusaku Ohta, Nazli Ismail

Bulletin of the Seismological Society of America Vol. 108 ( 4 ) page： 1918 - 1928 2018.6

Transient rheology of the oceanic asthenosphere following the 2012 Indian Ocean Earthquake inferred from geodetic data Reviewed

Cecep Pratama, Takeo Ito, Ryohei Sasajima, Takao Tabei, Fumiaki Kimata, Endra Gunawan, Yusaku Ohta, Tadashi Yamashina, Nazli Ismail, Irwandi Nurdin, Didik Sugiyanto, Umar Muksin, Irwan Meilano

JOURNAL OF ASIAN EARTH SCIENCES Vol. 147 page： 50 - 59 2017.10

Language：English Publishing type：Research paper (scientific journal) Publisher：PERGAMON-ELSEVIER SCIENCE LTD

Postseismic motion in the middle-field (100-500 km from the epicenter) geodetic data resulting from the 2012 Indian Ocean earthquake exhibited rapid change during the two months following the rupture. This pattern probably indicates multiple postseismic deformation mechanisms and might have been controlled by transient rheology. Therefore, the relative contribution of transient rheology in the oceanic asthenosphere and afterslip in the oceanic lithosphere should be incorporated to explain short- and long-term transitional features of post seismic signals. In this study, using two years of post-earthquake geodetic data from northern Sumatra, a three-dimensional spherical-earth finite-element model was constructed based on a heterogeneous structure and incorporating transient rheology. A rheology model combined with stress-driven afterslip was estimated. Our best fit model suggests an oceanic lithosphere thickness of 75 km with oceanic asthenosphere viscosity values of 1 x 10(17) Pas and 2 x 10(18) Pa s for the Kelvin and Maxwell viscosity models, respectively. The model results indicate that horizontal landward motion and vertical uplift in northern Sumatra require viscoelastic relaxation of the oceanic asthenosphere coupled with afterslip in the lithosphere. The present study demonstrates that transient rheology is essential for reproducing the rapidly changing motion of postseismic deformation in the middle-field area.

DOI： 10.1016/j.jseaes.2017.07.049

Web of Science

Scopus

Anisotropic Horizontal Thermal Contraction of Young Oceanic Lithosphere Inferred From Stress Release Due To Oceanic Intraplate Earthquakes Reviewed

Ryohei Sasajima, Takeo Ito

TECTONICS Vol. 36 ( 10 ) page： 1988 - 2021 2017.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER GEOPHYSICAL UNION

How freely the oceanic lithosphere contracts horizontally due to thermal contraction is important information, because it reflects the boundary condition of the oceanic lithosphere, which includes information regarding the magnitude of driving/resisting forces of plate tectonics. We investigated the horizontal thermal contraction of young oceanic lithosphere using an analysis of the intraplate stress release due to oceanic intraplate earthquakes (OCEQs) and numerical simulations. The stress release due to OCEQs in young oceanic lithosphere (5-15 Ma) shows significant differences between the spreading directional component and the ridge-parallel component. The extensional stress release of the ridge-parallel component is 6 times as large as that of the spreading directional component, while the compressional stress release of the ridge-parallel component is one seventh that of the spreading directional component. We conducted a numerical simulation of the thermal stress evolution of the oceanic lithosphere to investigate how the difference in the horizontal contraction rates between the spreading direction and the ridge-parallel direction can explain the observed anisotropic stress release. The result indicates that young oceanic lithosphere (5-15 Ma) barely contracts in the ridge-parallel direction (only 0-30% of the spreading directional contraction rate), while it contracts freely in the spreading direction due to the weakness of the oceanic ridge strength and the low-viscosity asthenosphere. From the results, we constrained the magnitude of the basal traction working on the bottom of the oceanic lithosphere to be smaller than 0.44 MPa.
Plain Language Summary How freely the oceanic lithosphere contracts horizontally due to thermal contraction is important information, because it reflects the boundary condition of the oceanic lithosphere, which includes information regarding the magnitude of driving/resisting forces of plate tectonics. We investigated the horizontal thermal contraction of the oceanic lithosphere using an analysis of the intraplate stress release due to oceanic intraplate earthquakes and found a significant anisotropy in the stress release in young oceanic lithosphere, that is, extensional stress release dominates in the ridge-parallel component while compressional stress release dominates in the spreading direction. Using a numerical simulation with the comparison to this observed result, we revealed that young oceanic lithosphere barely contracts in the ridge-parallel direction (only 0-25% of the spreading directional contraction rate), while it contracts freely in the spreading direction. The nearly free spreading directional contraction requires the smallness of the basal resistance traction on the bottom of the oceanic lithosphere, which implies the low-viscosity (weakness) of the oceanic asthenosphere. The ridge-parallel extensional thermal stress due to the estimated small ridge-parallel contraction may play a role in the weakening of the strength of the long oceanic transform faults; therefore, it may contribute to reduce the resistance to the seafloor spreading.

DOI： 10.1002/2017TC004680

Web of Science

Scopus

B-Value And Slip Rate Sensitivity Analysis For PGA Value In Lembang Fault And Cimandiri Fault Area Reviewed

Cecep Pratama, Takeo Ito, Irwan Meilano, Andri Dian Nugraha

PROCEEDING OF THE 6TH INTERNATIONAL SYMPOSIUM ON EARTH HAZARD AND DISASTER MITIGATION (ISEDM) 2016 Vol. 1857 2017.7

Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

We examine slip rate and b-value contribution of Peak Ground Acceleration (PGA), in probabilistic seismic hazard maps (10% probability of exceedence in 50 years or 500 years return period). Hazard curve of PGA have been investigated for Sukabumi and Bandung using a PSHA (Probabilistic Seismic Hazard Analysis). We observe that the most influence in the hazard estimate is crustal fault. Monte Carlo approach has been developed to assess the sensitivity. Uncertainty and coefficient of variation from slip rate and b-value in Lembang and Cimandiri Fault area have been calculated. We observe that seismic hazard estimates are sensitive to fault slip rate and b-value with uncertainty result are 0.25 g dan 0.1-0.2 g, respectively. For specific site, we found seismic hazard estimate are 0.4 + 0.13 g with COV 27% and 0.3 + 0.05 g with COV 13% for Sukabumi and Bandung, respectively.

DOI： 10.1063/1.4987083

Web of Science

Scopus

Geodetic and geomorphic evaluations of earthquake generation potential of the northern Sumatran fault, Indonesia Reviewed

Takao Tabei, Fumiaki Kimata, Takeo Ito, Endra Gunawan, Hiroyuki Tsutsumi, Yusaku Ohta, Tadashi Yamashina, Yoshio Soeda, Nazli Ismail, Irwandi Nurdin, Didik Sugiyanto, Irwan Meilano

International Association of Geodesy Symposia Vol. 145 page： 21 - 28 2017

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Springer Verlag

We have conducted geodetic and geomorphic observations in the northernmost part of Sumatra, Indonesia to monitor strain accumulation in the vicinity of the northern Sumatran fault. Evaluation of the earthquake generation potential in this region is highly urgent because of a large fault slip rate, absence of major earthquakes for more than 100 years and recent Coulomb stress increase on the fault due to the 2004 Sumatra-Andaman earthquake (Mw 9:2).We have deployed Aceh GPS Network for the Sumatran Fault System (AGNeSS) since 2005. The data collected have been used for estimating slip/locking distribution of the Sumatran fault and constructing a comprehensive model for postseismic deformation after the 2004 event. Tectonic geomorphic features are also important to reveal long-term slip history of the fault. We have used high-resolution stereo-paired ALOS (Advanced Land Observing Satellite) PRISM (Panchromatic Remote-sensing Instrument for Stereo Mapping) satellite images to map the surface trace of the Sumatran fault and conducted field observations to ensure the trace by geomorphic and geologic evidence. We introduce preliminary results of the fault mapping together with a brief description of the crustal deformation field detected by GPS.

DOI： 10.1007/1345_2015_200

Scopus

Inhomogeneous Spherical-Earth Finite Element Model of Coseismic Offset due to The 2012 Indian Ocean Earthquake Reviewed

Cecep Pratama, Takeo Ito, Takao Tabei

PROCEEDING OF THE 6TH INTERNATIONAL SYMPOSIUM ON EARTH HAZARD AND DISASTER MITIGATION (ISEDM) 2016 Vol. 1857 2017

Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

On April 11, 2012, a Mw 8.6 earthquake struck off the west coast of northern Sumatra approximately 300 km west of the Sunda trench following by Mw 8.2 two hours afterward. The 2012 Indian Ocean Earthquake sequence, which was the largest intraplate earthquake in recorded history, yielded seismic moment of 1.2-1.3 x 10(22) N m and 0.2-0.3 x 10(22) N m for the main shock (Mw 8.6) and the after shock (Mw 8.2), respectively. Aceh GPS Network for Sumatran Fault System (AGNeSS) observed a predominantly ENE coseismic offset up to 10 cm while the sites on the Andaman Island observed southward and southern part Sumatra GPS Array (SuGar) network observed northward. Limited far-field and inland GPS observation network might lead the homogeneous and half-space model insufficient to explain the coseismic offset. In that of sense, in order to estimate more realistic surface displacement due to complex subduction and far-field GPS station, we consider developing inhomogeneous three-dimensional finite element model incorporate subducting slab, three-dimensional velocity earth structure, realistic topography and bathymetry as well as sphericity of the earth. We calculate coseismic offset by forward modeling using slip distribution as reported from Wei et al. [7]. This study investigates the effect of inhomogeneous structure and spherical geometry model in reproducing actual coseimic offset due to 2012 Indian Ocean Earthquake.

DOI： 10.1063/1.4987066

Web of Science

Scopus

Measuring Deformation in Jakarta through Long Term Synthetic Aperture Radar (SAR) Data Analysis Reviewed

Agustan, Albertus Sulaiman, Takeo Ito

2nd International Conference of Indonesian Society for Remote Sensing (ICOIRS) Vol. 47 ( 1 ) 2016.12

Strain rate dependency of oceanic intraplate earthquake b-values at extremely low strain rates Reviewed

R.Sasajima and T. Ito

J. Geophys. Res 2016.6

Co-seismic offsets due to two earthquakes (Mw 6.1) along the Sumatran fault system derived from GNSS measurements Reviewed

T. Ito, E. Gunawan, F. Kimata, T. Tabei, I. Meilano, Agustan, Y. Ohta, N. Ismail, I. Nurdin and D. Sugiyanto

Earth, Planets and Space 2016.4

The Sensitivity of Surface Mass Loading Displacement Response to Peturbations in the Elastic Structure of the Crust and Mantle Reviewed

H. R. Martens, L. Rivera, M. Simons, and T. Ito

J. Geophys. Res. Solid Earth Vol. 121 2016.3

地震や火山の活動を捉えるミリメートル制度のGNSS観測

伊藤武男

名古屋大学理学部技術報告 ( 20 ) page： 19-23 2016.3

Studies of Internal Structure of the Earth and Geodynamics based on Geodesy Invited Reviewed

Vol. 61 ( 1 ) page： 1-15 2015.4

海洋潮汐がトリガーとなる氷河地震

伊藤武男，古本宗充

月刊地球 Vol. 425 ( 37 ) page： 37-43 2015.2

A comprehensive model of postseismic deformation of the 2004 Sumatra-Andaman earthquake deduced from GPS observations in northern Sumatra Reviewed

E. Gunawan, T. Sagiya, T. Ito, F. Kimata, T. Tabei, Y. Ohta, I. Meilano, H. Z. Abidine, Agustan, I. Nurdin and D. Sugiyanto

Journal Asian Earth Sciences page： Journal Asian Earth Sciences 2014

Isolating along-strike variations in the depth extent of shallow creep and fault locking on the northern Great Sumatran Fault Reviewed

Ito, T., E. Gunawan, F. Kimata, T. Tabei, M. Simons, I. Meilano, Agustan, Y. Ohta, I. Nurdin, and D. Sugiyanto

Journal of Geophysical Research 2012.5

Slip distribution of the 2011 off the Pacific coast of Tohoku Earthquake inferred from geodetic data Reviewed

Takeo Ito, Kazuhiro Ozawa, Tsuyoshi Watanabe, and Takeshi Sagiya

Earth Planets Space Vol. 63 page： 627-630 2011.9

Ground deformation detected by AGNeSS (Aceh GPS Network for Sumatran fault System) in North Sumatra after the 2004 Sumatra-Andaman earthquake

Endra Gunawan, Takeo Ito, Fumiaki Kimata, Takeshi Sagiya, Takao Tabei, Didik Sugiyanto/Irwandi, Irwan Meilano, Mipi A. Kusuma, Hasanuddin Z. Abidin, Agustan

The 6th Investigation Report of 2004 Northern Sumatra Earthquakes page： 112-121 2010.7

Spatio-temporal distribution of magma intrusions inducing repeated earthquake swarms off the east coast of the Izu peninsula, central Japan, for 1973-1998 Reviewed

Masayuki Murase, Takeo Ito, Yoshinari Hayashi, Takeshi Sagiya, Fumiaki Kimata and Hidefumi Watanabe

Journal of Volcanology and Geothermal Research Vol. 193 ( 1-2 ) page： 25-36 2010.3

スマトラ島北西部のスマトラ断層における地震発生ポテンシャル

伊藤武男, Endra Gunawan, 木股文昭, 田部井隆雄, Irwandi, Agstan, Irwan Meilano, Mark Simons

名古屋大学環境学研究科 2004 年北部スマトラ地震調査報告VI page： 107-111 2010

High resolution mapping of Earth tide response based on GPS data in Japan Reviewed

Takeo Ito, M. Okubo, T. Sagiya

Journal of Geodynamics page： 10.1016/j.jog.2009.09.012 2009.11

Crustal Deformation Studies in Java (Indonesia) Using GPS Reviewed

H. Z. Abidin, H. Andreas, T. Kato, T. Ito, I. Meilano, F. Kimata, D. H. Natawidjaya, H. Harjono

Journal of Earthquake and Tsunami Vol. 3 ( 2 ) page： 76-88 2009.10

Field challenge of continues GPS array maintenance on Sumatra Fault: report of the August 2008 AGNeSS continue site investigation

Irwandi, T. Ito, ,F. Kimata

The 5th Investigation Report of 2004 Northern Sumatra Earthquakes, Graduate School of Environmental Studies, Nagoya University page： 109-118 2009.5

スマトラGPS観測網（AGNeSS）のシステムの紹介

伊藤武男、木股文昭、Agstan、Endra Gunawan、田部井隆雄、Irwan Meilano、Didik Sugiyanto、Irwandi

名古屋大学全学技術センター（理学）装置開発系技術報告 Vol. 4 page： 26-29 2009

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

インドネシアスマトラ島においてGPS観測網を展開した．本論文は，その際に用いた観測システムの紹介をしている．このGPS観測網は観測データをオフラインで取得しているが，電力供給などが不安定なため，ソーラーパネルを併用した観測となっている．一方，観測機器は予算の都合上，一昔前の観測機器を用いているため，現地収録のメモリが小さいため，数日しか観測できない．そのため，超小型PC　(20cm×12cm×3cm)を現地に設置して，自動でデータを収集するシステムを構築した．

Coseismic and postseismic deformation related to the 2007 Chuetsu-oki, Niigata Earthquake Reviewed

Ohta, Y., S. Miura, T. Iinuma, K. Tachibana, T. Matsushima, H. Takahashi, T. Sagiya, T. Ito, S. Miyazaki, R. Doke, A. Takeuchi, K. Miyao, A. Hirao, T. Maeda, T. Yamaguchi, M. Takada, M. Iwakuni, T. Ochi, I. Meilano, and A. Hasegawa

Earth Planets Space Vol. 60 ( 11 ) page： 1081-1086 2008.11

Postseismic slip associated with the 2007 Chuetsu-oki, Niigata, Japan, Earthquake (M 6.8 on 16 July 2007) as inferred from GPS data Reviewed

Takeshi Iinuma, Yusaku Ohta, Satoshi Miura, Kenji Tachibana, Takeshi Matsushima, Hiroaki Takahashi, Takeshi Sagiya, Takeo Ito, Shin'ichi Miyazaki, Ryosuke Doke, Akira Takeuchi, Kayo Miyao, Akihiko Hirao, Takahiro Maeda, Teruhiro Yamaguchi, Masamitsu Takada, Makiko Iwakuni, Tadafumi Ochi, Irwan Meilano, and Akira Hasegawa

Earth Planets Space Vol. 60 ( 11 ) page： 1087-1091 2008.11

Post-seismic crustal movements derived from GPS observations due to the 2004 Sumatra-Andaman earthquake

T.Kato, C.D.Reddy, S.K. Prajapati, F.Kimata, Agustan, I.Meilano, Y.Ohta, T.Ito, D.Darmawan, H.Andreas, H.Z.Abidin, M.A.Kusuma, D.Sugianto, T.Tabei, M.Satomura, P.Wu and M.Hashimoto

Proceedings of the Inernational Symposium on the Restoration Program from Giant Earthquaeks and Tsunamis page： 43-48 2008.1

*The construction of new dense GPS observation network: AGNeSS (Aceh GPS Network for Sumatran Fault System)

T.Ito, Agustan, I.meilano, T.Tabei and F.Kimata

Proceedings of the Inernational Symposium on the Restoration Program from Giant Earthquaeks and Tsunamis page： 63-67 2008.1

Post-seismic Phase Duration of the 2004 Sumatra-Andaman Earthquake as Estimated from GPS Continuous Data

H.Z.Abidin, I.Malra, H.Andreas, I.Meilano, F.Kimata, T.Ito, Y.Ohtra, Agustan and D.Sugiyanto

Proceedings of the Inernational Symposium on the Restoration Program from Giant Earthquaeks and Tsunamis page： 57-61 2008.1

インドネシア国スマトラにおけるGPS観測のための予備調査ースマトラのGPS観測による2004年アチェ・アンダマン地震の滑り分布の推定ー

木股文昭・伊藤武男・太田雄策・Meilano IRWAN・田部井隆雄

防災科学技術研究所資料 Vol. 304 2007.3

Two Yeares GPS Observation in Aceh

M. Irwan, Y. Ohta, F. Kimata, T. Ito, T. Tabei, D. Darmawan, H. Andreas, A. Hasannudin, K. Mipi, S. Sugiyanto, Agustan

The 3rd Investigation Report of 2004 Northern Sumatra Earthquakes, Graduate School of Environmental Studies, Nagoya University page： 7－10 2007

スマトラアンダマン地震の地震測地学的な側面からの知見

伊藤武男, 太田雄策, Irwan Meilano, 木股文昭

page： 11－14 2007

Time-dependent model for volume changes in pressure sources at Asama volcano, central Japan due to vertical deformations detected by precise leveling during 1902-2005 Reviewed

Masayuki Murase, Koji Ono, Takeo Ito, Rikio Miyajima, Hitoshi Mori, Hiroshi Aoyama, Hiromitu Oshima, Yuka Yoshida, Akihiko Terada, Eturo Koyama, Toyotarou Takeda, Hidefumi Watanabe, Fumiaki Kimata, Naoyuki Fujii

Journal of Volcanology and Geothermal Research Vol. 164 page： 54-75 2007

High-resolution aftershock observations in the source region of the 2004 mid-Niigata Prefecture Earthquake Reviewed

Aitaro Kato and The Research Team of aftershock observations for the 2004 mid-Niigata Prefecture Earthquake

Earth Planets Space Vol. 59 page： 923-928 2007

Preliminary report on crustal deformation surveys and tsunami measurements caused by the july 17, 2006 South off Java Island Earthquake and Tsunami, Indonesia Reviewed

Teruyuki Kato, Takeo Ito, Hasanuddin Z. Abidin, and Agustan

Earth Planets Space Vol. 59 page： 1055-1059 2007

地震火山・防災研究センターの観測網のIP網化について

伊藤武男

名古屋大学全学技術センター（理学）装置開発系技術報告 Vol. 1 page： 41-44 2006

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

当センターの観測システムをIP網化した際のノウハウを記した報告書です．とくに，現状のシステムを止める事無く，新しいシステムに移行することや，地震観測網と地殻変動連続観測網との統合などについて，記してある．これらの技術は一般的なネットワーク技術であるため，汎用性は高い．

Evaluation of visco-elastic and poro-elastic deformations following 2004 Sumatra-Andaman earthquake

T. Ito, S. Kawamoto, Y. Ohota, I. Meilano and F. Kimata

Investigation Report of 2004 Northern Sumatra Earthquakes (part 2), Graduate School of Environmental Studies, Nagoya University page： 114-119 2006

Crustal deformation following the 2004 Sumatra-Andaman earthquake in the northern Sumatra region (Preliminary Report)

Y. Ohota, M. Irwan, T. Ito, F. Kimata, T. Tabei and D. Sugiyanto

Investigation Report of 2004 Northern Sumatra Earthquakes (part 2), Graduate School of Environmental Studies, Nagoya University page： 109-113 2006

Seismic exploration at Fuji volcano with active sources-The outline of the experiment and the arrival time data- Reviewed

Vol. 81 ( 1 ) page： 71-94 2006

GPS measurement of coseismic displacement in Aceh province after the 2004 Aceh-Andaman earthquake Investigation Report of 2004 Northern Sumatra Earthquakes (part 2)

M. Irwan, Y. Ohota, D. Darmawan, H. Andreas, H. Z. Abidin, M. A. Kusuma, D. Sugiyanto, Agustan, T. Ito, T. Tabei and F. Kimata

Investigation Report of 2004 Northern Sumatra Earthquakes (part 2), Graduate School of Environmental Studies, Nagoya University page： 103-108 2006

スマトラのＧＰＳ観測から見えてきた滑り分布：スマトラアチェでのＧＰＳ観測から見えてきた2004年アチェ・アンダマン地震の滑り分布

木股文昭・伊藤武男・太田雄策・メイラノイルワン・田部井隆雄

月刊地球、スマトラ地震特集号 page： 86-94 2006

石英管伸縮計で観測された低周波地震活動に関する歪変化

仮屋新一, 伊藤武男, 山内常生, 木股文昭

東濃地震科学研究所報告 Vol. 20 page： 185-196 2006

GPSデータに基づくスマトラ沖地震の余効変動

太田雄策, Meilano Irwan, 伊藤武男, 木股文昭, 田部井隆雄, Didik Sugiyant

地震学会ニュースレター Vol. 7 page： 21-22 2005

スマトラ沖地震のGPS観測

伊藤武男, 木股文昭, イルワンメイラノ, 太田雄策, 田部井隆雄

地震学会ニュースレター Vol. 5 page： 15-17 2005

変動地形に基づく2004年中越地震の断層モデル Reviewed

渡辺満久, 鈴木康弘, 伊藤武男

地震 Vol. 2 ( 58 ) page： 297－307 2005

Nonlinear multidimensional scaling and visualization of earthquake clusters over space, time and feature space Reviewed

W. Dzwinel, D.A. Yuen, K. Boryczko, Y. Ben-Zion, S. Yoshioka, and T. Ito

Nonlinear Processes in Geophysics Vol. 12 page： 117－128 2005

稠密GPS観測による2003年十勝沖地震の余効変動観測

笠原稔, 高橋浩晃, 岡崎紀俊, 中尾茂, 鷺谷威, 伊藤武男, 大谷文夫, 佐藤一敏, 藤田安良, 橋本学, 細善信, 加藤照之, 飯沼卓史, 福田淳一, 松島健, 河野裕希

月刊地球, 号外 Vol. 49 page： 105-111 2005

御嶽山群発地震域において精密水準測量から検出された地盤の隆起変動 2002年4月-2004年4月

木股文昭,村瀬雅之宮,島力雄,Dudy Darmawan,伊藤武男,高野和友,太田雄策,Irwan Meirano,Herri Anderson,David Solim,Fauzan Ibrahim,小山悦郎,辻浩,高山鐵郎,内田和也,岡田純

東濃地震科学研究所報告書 Vol. 14 page： 7-18 2004.5

GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (Mjma 8.0), off southeastern Hokkaido, Japan Reviewed

H. Takahashi, S. Nakao, N. Okazaki, J. Koyama, T. Sagiya, T. Ito, F. Ohya, K. Sato, Y. Fujita, M. Hashimoto, Y. Hoso, T. Kato, T. Iinuma, J. Fukuda, T. Matsushima, Y. Kohno, and M. Kasahara

Earth Planets Space Vol. 56 page： 377-382 2004

*Spatiotemporal distribution of interplate coupling in southwest Japan from inversion of geodetic data Reviewed

T. Ito, M. Hashimoto

Journal of Geophysical Research page： 2002JB002358RR 2004

Ground uplift detected by precise leveling in the Ontake earthquake swarm area, central Japan in 2002-2004 Reviewed

Kimata F, Miyajima R, Murase M, Darwaman D, Ito T, Ohata Y, Irwan M, Takano K, Ibrahim F, Koyama E, Tsuji H, Takayama T, Uchida K, Okada J, Solim D, Anderson H

EARTH PLANETS AND SPACE Vol. 56 ( 12 ) page： E45-E48 2004

日本列島の移動性地殻変動

伊藤武男, 橋本学

月刊地球, 25, 2, 114-118, 2003. Vol. 25 ( 2 ) page： 114-118 2003

A model of dyke intrusion near Miyake, Nii and Kozu Islands in 2000 Reviewed

T. Ito, S. Yoshioka

Tectonophysics Vol. 359 page： 171-187 2002

Interplate coupling in northeast Japan deduced from inversion analysis of GPS data Reviewed

T. Ito, S. Yoshioka and S. Miyazaki

Earth and Planetary Science Letters Vol. 176 page： 117-130 2000

Interplate coupling in southwest Japan deduced from inversion analysis of GPS data Reviewed

T. Ito, S. Yoshioka and S. Miyazaki

Physics of the Earth and Planetary Interiors Vol. 115 page： 17-34 1999

ＧＰＳデータのインヴァージョン解析から推定した東北日本におけるプレート間カップリングの推定

伊藤武男, 吉岡祥一, 宮崎真一

月刊地球, 25, 158-165, 1999. Vol. 25 page： 158-165 1999

ＧＰＳデータを用いた西南日本におけるプレート間カップリングの推定

吉岡祥一, 伊藤武男, 宮崎真一

月刊地球 Vol. 21 page： 197-204 1999

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