Faculty Profiles - SAGIYA, Takeshi

Papers - SAGIYA, Takeshi

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A decade of GEONET: 1994-2003 - The continuous GPS observation in Japan and its impact on earthquake studies - Reviewed

Sagiya, T.

Earth Planets Space Vol. 56 page： xxix-xli 2004

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

The dense continuous GPS network of Japan, now called GEONET, has been operated since 1994 by the Geographical Survey Institute. GEONET provides precise daily coordinates of all the stations, with which displacement rates and strain rates are calculated nationwide. Various characteristics of tectonic deformation in the Japanese Islands have been revealed. GEONET is also quite useful in earthquake studies, precisely detecting co-seismic, post-seismic, and inter-seismic deformation signals. These observations are utilized to infer physical processes at earthquake sources. Slow slip events on plate boundaries have been found from GPS data. Such slow events provide
an important constraint on the mechanism of faulting. On the other hand, there has been no success in detecting pre-seismic deformation. Lack of a precursory signal before the 2003 Tokachi-Oki (M8.0) earthquake has posed
a serious question to short-term earthquake prediction. GEONET enables a good linkage between monitoring and modeling studies, opening a possibility of practical data assimilation. For further contribution to earthquake studies,
it is necessary to continue GEONET with high traceability on the details in observation and analysis.

DOI： 10.1186/BF03353077

Detection of a slow slip event from small signal in GPS data Reviewed

Sato, T., K. Imanishi, N. Kato, and T. Sagiya

Geophys. Res. Lett. Vol. 31 2004.3

GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (MJMA8.0), off southeastern Hokkaido, Japan Reviewed

Takahashi, H., 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

Reexamination of the interplate coupling in the Tokai region, central Japan, based on the GPS data in 1997-2002 Reviewed

Ohta, Y., F. Kimata, and T. Sagiya

Geophys. Res. Lett. Vol. 31 page： L24604, doi:10.1029/2004GL021404 2004

*Interplate coupling in the Kanto District, central Japan, and the Boso Silent earthquake in May 1996 Reviewed

Sagiya, T.

PAGEOPH Vol. 161 ( 11-12 ) page： 2601-2616 2004

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

Using continuous GPS data, I estimated interplate coupling along the Sagami Trough subduction zone in the southern Kanto district. The shallow part of the plate boundary is considered to be fully locked and accumulating stress. In 1996, southeastern off the Boso Peninsula, anomalous slow deformation was detected and it is interpreted as a result of slow fault rupture on the plate boundary surface. Comparison of these results demonstrates that strongly locked patch and slow slip region show compensative distribution each other, supporting the basic concept of the asperity model.

DOI： 10.1007/s00024-004-2566-6

Temporal change of interplate coupling in northeastern Japan during 1995-2002 estimated from continuous GPS observations Reviewed

Nishimura, T., T. Hirasawa, S. Miyazaki, T. Sagiya, T. Tada, S. Miura, and K. Tanaka

Geophys. J. Int. Vol. 157 page： 901-916 2004

GPS連続観測による長町-利府断層帯およびその周辺（東北地方中部）の地殻変動 Reviewed

西村卓也, 鷺谷威, 三浦哲

地震 Vol. 56 page： 497-510 2004

Measuring ground deformations with 1-Hz GPS data: the 2003 Tokachi-oki earthquake (preliminary report) Reviewed

Irwan, M., F. Kimata, K. Hirahara, T. Sagiya, and A. Yamagiwa

Earth Planets Space Vol. 56 page： 389-393 2004

1918年大町地震の震源断層モデル―水準測量データの再検討と関連データの総合的解釈に基づく新たなモデル―

鷺谷威

地震 Vol. 56 page： 199-211 2003

日本列島の地殻変動と地震・火山・テクトニクスー多田堯先生を偲ぶー

橋本学・鷺谷威

月刊地球 Vol. 25 page： 3-14 2003

測地測量データで見る中部日本の地殻変動

鷺谷威・井上政明

月刊地球 Vol. 25 page： 918-928 2003

地殻活動予測のための地殻変動データ同化

鷺谷威

月刊地球 Vol. 25 page： 687-693 2003

GPSによるゆっくり地震の解析

鷺谷威

科学 Vol. 73 page： 1006-1011 2003

青森県東方沖の地震空白域内に発生した地震（2001年8月14日, M6.2）の破壊過程と地殻変動

佐藤魂夫・今西和俊・加藤尚之・鷺谷威

東北地域災害科学研究 Vol. 39 page： 13-19 2003

地殻活動観測データ総合解析システムの開発

鷺谷威・西村卓也・村上亮・今給黎哲郎・赤坂望

国土地理院時報 Vol. 101 page： 33-43 2003

東海地方における非地震性滑りの検出とその現状

小沢慎三郎・村上亮・海津優・多田堯・鷺谷威・畑中雄樹・矢来博司・西村卓也

月刊地球 Vol. 25 page： 70-74 2003

日本列島周辺で発生した大地震の静的断層モデルー多田堯先生の業績と1918年大町地震の断層モデルー

鷺谷威

月刊地球 Vol. 25 page： 51-58 2003

A revised dislocation model of interseismic deformation of the Cascadia subduction zone Reviewed International coauthorship

Wang, K., R. Wells, S. Mazzotti, R. D. Hyndman, and T. Sagiya

J. Geophys. Res. Vol. 108 2003

1968年十勝沖地震の北側アスペリティ近傍に発生した地震(2001年8月14日, Mw6.4)の余効すべり Reviewed

佐藤魂夫・今西和俊・加藤尚之・鷺谷威

東京大学地震研究所彙報 Vol. 78 page： 227-243 2003

震源断層となりうる活断層とリニア面との検討ー中国地方を事例としてー Reviewed

高田圭太・中田高・野原壮・原口強・池田安隆・伊藤潔・今泉俊文・大槻憲四郎・鷺谷威・堤浩之

活断層研究 Vol. 23 page： 77-91 2003

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Papers - SAGIYA, Takeshi