研究者詳細 - 伊藤　武男

論文 - 伊藤　武男

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B-value and slip rate sensitivity analysis for PGA value in Lembang fault and cimandiri fault area 査読有り

Pratama C., Ito T., Meilano I., Nugraha A.

AIP Conference Proceedings 1857 巻 2017年7月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：AIP Conference Proceedings

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 0.49 + 0.13 g with COV 27% and 0.39 + 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 査読有り

Tabei T., Kimata F., Ito T., Gunawan E., Tsutsumi H., Ohta Y., Yamashina T., Soeda Y., Ismail N., Nurdin I., Sugiyanto D., Meilano I.

International Association of Geodesy Symposia 145 巻頁： 21 - 28 2017年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：International Association of Geodesy Symposia

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 査読有り

Pratama C., Ito T., Tabei T.

AIP Conference Proceedings 1857 巻 2017年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：AIP Conference Proceedings

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 × 1022 N m and 0.2-0.3 × 1022 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 査読有り

Agustan, Albertus Sulaiman, Takeo Ito

2nd International Conference of Indonesian Society for Remote Sensing (ICOIRS) 47 巻 ( 1 ) 2016年12月

Strain rate dependency of oceanic intraplate earthquake b-values at extremely low strain rates 査読有り

R.Sasajima and T. Ito

J. Geophys. Res 2016年6月

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

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年4月

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

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

J. Geophys. Res. Solid Earth 121 巻 2016年3月

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 ) 頁： 19-23 2016年3月

測地学的手法を統合的に活用した地球内部構造とダイナミクスの解明招待有り査読有り

伊藤武男

測地学会誌 61 巻 ( 1 ) 頁： 1-15 2015年4月

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 425 巻 ( 37 ) 頁： 37-43 2015年2月

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

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 頁： Journal Asian Earth Sciences 2014年

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

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年5月

Slip distribution of the 2011 off the Pacific coast of Tohoku Earthquake inferred from geodetic data 査読有り

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

Earth Planets Space 63 巻頁： 627-630 2011年9月

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 頁： 112-121 2010年7月

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

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

Journal of Volcanology and Geothermal Research 193 巻 ( 1-2 ) 頁： 25-36 2010年3月

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 頁： 107-111 2010年

High resolution mapping of Earth tide response based on GPS data in Japan 査読有り

Takeo Ito, M. Okubo, T. Sagiya

Journal of Geodynamics 頁： 10.1016/j.jog.2009.09.012 2009年11月

Crustal Deformation Studies in Java (Indonesia) Using GPS 査読有り

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

Journal of Earthquake and Tsunami 3 巻 ( 2 ) 頁： 76-88 2009年10月

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 頁： 109-118 2009年5月

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 4 巻頁： 26-29 2009年

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（大学，研究機関等紀要）

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．

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