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

被引：0

作者：

Hiroaki Takahashi

Shigeru Nakao

Noritoshi Okazaki

Junji Koyama

Takeshi Sagiya

Takeo Ito

Fumio Ohya

Kazutoshi Sato

Yasuyoshi Fujita

Manabu Hashimoto

Yoshinobu Hoso

Teruyuki Kato

Takeshi Iinuma

Jun’ichi Fukuda

Takeshi Matsushima

Yuhki Kohno

Minoru Kasahara

机构：

[1] Hokkaido University,Institute of Seismology and Volcanology

[2] University of Tokyo,Earthquake Research Institute

[3] Geological Survey of Hokkaido,Division of Earth and Planetary Sciences

[4] Hokkaido University,Research Center for Seismology, Volcanology and Disaster Mitigation

[5] Nagoya University,Disaster Prevention Research Institute

[6] Kyoto University,Institute of Seismology and Volcanology

[7] Kyushu University,undefined

来源：

Earth, Planets and Space | 2004年 / 56卷

关键词：

The 2003 Tokachi-oki earthquake; GPS; postseismic deformation; afterslip;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

To investigate the postseismic crustal deformation associated with the Tokachi-oki earthquake (MJMA = 8.0) of 26 September 2003 in Japan Standard Time (JST), off southeastern Hokkaido, Japan, we newly established thirty GPS sites just after the mainshock in the eastern part of Hokkaido. Rapid data analysis for one month after the mainshock clearly indicated postseismic displacements only in the horizontal components. Observed maximum horizontal displacement was 6.6 cm from 28 September to 24 October, 2003. Absence of the vertical suggests that afterslip occurred in and around the coseismic fault rather than at downdip extension. Time series of coordinates are characterized by logarithmic decay functions with 4–11 days relaxation times. This suggests that postseismic deformation was due to afterslip on the fault following the large earthquake.

引用

页码：377 / 382

页数：5

共 58 条

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