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Coseismic deformation due to the 2007 Chuetsu-oki earthquake (Mw = 6.8)

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Title: Coseismic deformation due to the 2007 Chuetsu-oki earthquake (Mw = 6.8)
Authors: Aoki, Yosuke Browse this author
Furuya, Masato Browse this author →KAKEN DB
Kato, Teruyuki Browse this author
Keywords: Coseismic deformation
Global Positioning System
Synthetic Aperture Radar
Interferometry
Issue Date: 18-Nov-2008
Publisher: TERRAPUB
Journal Title: Earth, Planets and Space
Volume: 60
Issue: 11
Start Page: 1075
End Page: 1080
Abstract: Global Positioning System (GPS) and Synthetic Aperture Radar Interferometry (InSAR) detected substantial ground deformation due to the 2007 Chuetsu-oki earthquake (Mw = 6.8); GPS observation detected a horizontal deformation of up to about 170 mm and subsidence of up to 30 mm, and InSAR detected up to 290 mm of line-of-sight changes. A fault model is proposed to fit the ground deformation field as well as the aftershock distribution. Our model shows that a northwest-dipping fault to the north and a southeast-dipping fault to the south, consistent with the aftershock distribution, fits well with the observed data. However, our model also suggests that the modeled faults are likely to extend to shallower depths, where aftershocks are terminated. Combining our model with the subsurface structure suggests that the earthquake rupture initiated at depth and propagated into shallower depths that are not capable of nucleating an earthquake because of the presence of unconsolidated sediments.
Type: article
URI: http://hdl.handle.net/2115/52819
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 古屋 正人

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