Faculty Profiles - ITO Takeo

Papers - ITO Takeo

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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．

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