GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (MJMA8.0), off southeastern Hokkaido, Japan
スポンサーリンク
概要
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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.
- 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文
著者
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Koyama Junji
Division Of Earth And Planetary Sciences Graduate School Of Science Hokkaido University
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Sato Kazutoshi
Disaster Prevention Research Institute Kyoto University
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Kato Teruyuki
Earthquake Research Institute The University Of Tokyo
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OKAZAKI Noritoshi
Geological Survey of Hokkaido
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Hoso Yoshinobu
Disaster Prevention Research Institute Kyoto University
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Ohya Fumio
Disaster Prevention Research Institute Kyoto University
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Kohno Yuhki
Institute Of Seismology And Volcanology Faculty Of Sciences Kyushu University
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Fujita Yasuyoshi
Disaster Prevention Research Institute Kyoto University
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Hashimoto Manabu
Disaster Prevention Research Institute Kyoto University
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Nakao Shigeru
Earthquake Research Institute University Of Tokyo
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Iinuma Takeshi
Earthquake Research Institute University Of Tokyo
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Matsushima Takeshi
Institute For Solid State Physics University Of Tokyo
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Ito Takeo
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Kasahara Minoru
Institute Of Seismology And Volcanology Graduate School Hokkaido University
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Takahashi Hiroaki
Instit.of Environ.toxicol.
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Sagiya Takeshi
Research Center For Seismology Volcanology And Disaster Mitigation Graduate School Of Environmental Studies Nagoya University
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Kohno Yuhki
Institute of Seismology and Volcanology, Kyushu University
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