Coseismic and postseismic deformation related to the 2007 Chuetsu-oki, Niigata Earthquake

Autor: Satoshi Miura, Teruhiro Yamaguchi, Yusaku Ohta, Makiko Iwakuni, Shin'ichi Miyazaki, Kenji Tachibana, Irwan Meilano, Takeo Ito, Akira Hasegawa, Tadafumi Ochi, Ryosuke Doke, Akira Takeuchi, Kayo Miyao, Takeshi Sagiya, Masamitsu Takada, Hirao Akihiko, Takeshi Iinuma, Takahiro Maeda, Hiroaki Takahashi, Takeshi Matsushima
Rok vydání: 2008
Předmět:
Zdroj: Scopus-Elsevier
ResearcherID
ISSN: 1880-5981
DOI: 10.1186/bf03353140
Popis: An intermediate-strength earthquake of magnitudeMj6.8 occurred on July 16, 2007, centered beneath the Japan Sea a few kilometers offshore of Niigata Prefecture in central Japan. We constructed a dense GPS network to investigate postseismic deformation after this event, choosing our GPS sites carefully so as to complement the nationwide GPS GEONET array. Coseismic displacements caused by the mainshock detected at some GEONET sites were used to estimate coseismic fault parameters. The results indicate that the geodetic data can be explained by a combination of two rectangular faults dipping northwest and southeast. Minor but definite postseismic deformation was detected largely in the southern part of the dense network. The time series of site coordinates can be characterized by a logarithmic decay function, and the estimated time constant seems to be almost similar in range to that of the 2004 Mid-Niigata Prefecture Earthquake. We also found a possible site instability at 960566 (Izumo-zaki, GEONET) caused by a small, local landslide associated with the mainshock and therefore concluded that the data obtained at this site should not be used for coseismic or postseismic analysis.
Databáze: OpenAIRE
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