Faculty Profiles - SAGIYA, Takeshi

Papers - SAGIYA, Takeshi

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中部・東北日本におけるプレート内歪み集中帯ーその構造，変形と地学的意義ー

鷺谷　威

月刊地球 Vol. 29 page： 376-382 2007

「ひずみ集中帯」とは何か

鷺谷　威

科学 Vol. 77 page： 1200-1205 2007

Crustal block kinematics and seismic potential of the northernmost Philippine Sea plate and Izu microplatem central Japan, inferred from GPS and leveling data Reviewed International coauthorship

Nishimura, T., T. Sagiya, and R. S. Stein

J. Geophys. Res. Vol. 112 page： doi:10.1029/2005JB004102 2007

Dense GPS array observations across the Atotsugawa Fault system in central Japan Reviewed

Hirahara, K., M. Ohzono, T. Sagiya, Y. Hoso, Y. Yada, and M. Ando

Geodynamics of Atotsugawa Fault System page： 25-44 2007

糸魚川ー静岡構造線と歪み集中帯ー測地データから見る松代群発地震の背景ー

鷺谷　威

月刊地球 Vol. 28 ( 12 ) page： 838-844 2006.12

Crustal movement of Antarctica and Showa Station, based on GPS measurements Reviewed

M. Ohzono, T. Tabei, K. Doi, K. Shibuya, and T. Sagiya

Earth, Planets and Space Vol. 58 ( 7 ) page： 795-804 2006.7

Large surface wave of the 2004 Sumatra-Andaman earthquake captured by the very long baseline kinematic analysis of 1-Hz GPS dat Reviewed

Y. Ohta, I. Meilano, T. Sagiya, F. Kimata and K. Hirahara

Earth, Planets and Space Vol. 58 ( 2 ) page： 153-157 2006.2

中越地震と歪み集中帯

鷺谷威

月刊地球 Vol. 号外53 page： 82-89 2006

糸魚川ー静岡構造線断層帯北部における変形過程の有限要素モデル

鷺谷威

月刊地球 Vol. 号外50 page： 116-122 2005

2004年新潟県中越地震の震源域南部周辺における余効変動 Reviewed

鷺谷威・大園真子・西脇周平・太田雄策・佐々木雅子・山室友生・木股文昭

地震 Vol. 58 page： 359-369 2005

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

2004年10月23日に発生した新潟県中越地震震源域の南側において，GPS連続観測を実施して余効変動を検出した．また，余効変動が生じるメカニズムとして，地表付近の断層面における余効すべりが生じていた可能性を指摘した．

DOI： 10.4294/zisin1948.58.3_359

測地学的歪み速度と地質学的歪み速度の矛盾は解消可能か？

鷺谷威

月刊地球 Vol. 号外46 page： 183-189 2004

1944年東南海地震前後の地殻変動再考

鷺谷威

月刊地球 Vol. 26 page： 746-753 2004

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

1944年東南海地震前に観測されたと言われている掛川付近における傾斜の異常変化について考察を行い，観測精度から見て変化が必ずしも有意ではないこと，これまで言われていた地震発生前の傾斜の加速は，データからは指示されないこと，また，傾斜変化を説明するにはプレート境界よりも浅い部分の断層運動が必要なことを指摘し，東南海地震の前兆とする見方に対して疑問を呈した．

Heterogeneous crustal deformation along the Central-Northern Itoigawa-Shizuoka Tectonic Line Fault System, central Japan Reviewed

Sagiya T., T. Nishimura, and Y. Iio

Earth Planets Space Vol. 56 ( 12 ) page： 1247-1252 2004.12

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

Based on continuous GPS observation around the Itoigawa-Shizuoka Tectonic Line, central Japan, we found significant lateral heterogeneity in crustal deformation style along the tectonic line, which suggest complex behavior of the active fault. In addition, geodetic strain rate is found to have a good correspondence with the electronic registivity structure in the lower crust, implying lower crustal processes may control the stress accumulation process of the active faults.

DOI： 10.1186/BF03353347

Origin of the concentrated deformation zone in the Japanese Islands and stress accumulation process of intraplate earthquakes Reviewed

Iio, Y., T. Sagiya, and Y. Kobayashi

Earth, Planets Space Vol. 56 ( 12 ) page： 831-842 2004.12

A comprehensive model of the deformation in the Nagamachi-Rifu Fault Zone Reviewed

Iio, Y., T. Sagiya, N. Umino, T. Nishimura, K. Takahashi, and T. Homma

Earth Planets Space, Vol. 56 ( 12 ) page： 1339-1345 2004.12

What controls the occurrence of shallow intraplate earthquakes ? Reviewed

Iio, Y., T. Sagiya, and Y. Kobayashi

Earth Planets Space Vol. 56 ( 12 ) page： 1077-1086 2004.12

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

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