Crustal deformation and a preliminary fault model of the 2007 Chuetsu-oki earthquake observed by GPS, InSAR, and leveling

被引:0
作者
Takuya Nishimura
Mikio Tobita
Hiroshi Yarai
Shinzaburo Ozawa
Makoto Murakami
Toru Yutsudo
Masayoshi Ishimoto
Takeshi Umesawa
Takashi Toyofuku
Satoshi Kawamoto
Tomomi Amagai
Midori Fujiwara
Akira Suzuki
Syunji Enya
Toshiyuki Sasaki
Masanori Yokokawa
Syuichi Oomori
Setsuo Tanoue
Hisao Ikeda
Moriyuki Nemoto
Hisashi Suito
Fumi Hayashi
Hiroshi Une
Mamoru Koarai
Masaharu Tsuzawa
机构
[1] Geographical Survey Institute,Graduate School of Science
[2] Hokkaido University,undefined
[3] College of Land,undefined
[4] Infrastructure,undefined
[5] Transport,undefined
[6] and Tourism,undefined
来源
Earth, Planets and Space | 2008年 / 60卷
关键词
2007 Chuetsu-oki earthquake; crustal deformation; GPS; InSAR; leveling;
D O I
暂无
中图分类号
学科分类号
摘要
The 2007 Chuetsu-oki earthquake occurred just west off the coast of Kashiwazaki in Niigata Prefecture, Central Japan on July 16, 2007. The permanent GPS network (GEONET) clarifies the coseismic displacement as a thrust faulting whose compressional axis lies in the NW-SE direction. Interferometric analysis of synthetic aperture radar (SAR) images acquired by “Daichi” satellite (ALOS) maps a detailed spatial pattern of the displacement toward the satellite for both ascending and descending orbits. Peak-to-peak displacement reaches approximately 400 mm in the descending orbit interferometric (In)SAR data. Repeated precise leveling shows uplift near the northeast part of the aftershock area and subsidence near the southwestern part. We construct a preliminary fault model by inverting the observed deformation. The preferred model consists of two segments of rectangular faults whose moment magnitude is 6.7 in total. From only the used geodetic data on land, it is difficult to determine which plane in two conjugate planes of the focal solution was ruptured. It is important to consider the effect of a heterogeneous medium and variable slip on the faults as well as other geophysical data to determine the fault model with confidence.
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页码:1093 / 1098
页数:5
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