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- W2017134852 abstract "The Chengkung earthquake with ML = 6.6 occurred in eastern Taiwan at 12:38 local time on December 10th 2003. Based on the main shock relocation and aftershock distribution, the Chengkung earthquake occurred along the previously recognized N20°E trending Chihshang fault. This event did not cause human loss, but significant cracks developed at the ground surface and damaged some buildings. After 1951 Taitung earthquake, there was no larger ML > 6 earthquake occurred in this region until the Chengkung earthquake. As a result, the Chengkung earthquake is a good opportunity to study the seismogenic structure of the Chihshang fault. The coseismic displacements recorded by GPS show a fan-shaped distribution with maximal displacement of about 30 cm near the epicenter. The aftershocks of the Chengkung earthquake revealing an apparent linear distribution helps us to construct the clear fault geometry of the Chihshang fault. In this study, we employ a half-space angular elastic dislocation model with GPS observations to figure out the slip distribution and seismological behavior of the Chengkung earthquake on the Chihshang fault. The elastic half-space dislocation model reveals that the Chengkung earthquake is a thrust event with minor left-lateral strike-slip component. The maximum coseismic slip is located around the depth of 20 km and up to 1.1 m. The slips are gradually decreased to less than 10 cm near the surface part of the Chihshang fault. The seismogenic fault plane, which is constructed by the delineation of the aftershocks, demonstrates that the Chihshang fault is a high-angle fault. However the fault plane changes to a flat plane at depth of 20 km. In addition, a significant part of the measured deformation across the surface fault zone for this earthquake can be attributed to postseismic creep. The postseismic elastic dislocation model shows that most afterslips are distributed to the upper level of the Chihshang fault. And most afterslips consist of both of dip- and left-lateral slip. The model results show that the Chihshang fault may be partially locked or damped near surface during coseismic slip. After the mainshock, the strain, which cumulated near the surface, was released by postseismic creep resulting in significant postseismic deformation." @default.
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- W2017134852 date "2009-03-01" @default.
- W2017134852 modified "2023-10-01" @default.
- W2017134852 title "Coseismic and postseismic slip distribution of the 2003 Mw=6.5 Chengkung earthquake in eastern Taiwan: Elastic modeling from inversion of GPS data" @default.
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- W2017134852 doi "https://doi.org/10.1016/j.tecto.2007.11.021" @default.
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