Coseismic versus interseismic ground deformations, fault rupture inversion and segmentation revealed by 2003 Mw 6.8 Chengkung earthquake in eastern Taiwan
Journal
Geophysical Research Letters
Journal Volume
33
Journal Issue
2
Date Issued
2006
Author(s)
Wu Y.M.; Chen Y.G.; Shin T.C.; Kuochen H.; Hou C.S.; Hu J.C.; Chang C.H.; Wu C.F.; Teng T.L.
DOI
GPRLA
Abstract
The 2003 Chengkung earthquake (Mw 6.8) provided diagnostic evidence for a source model showing the deformation process of the seismogenic Chihshang fault in eastern Taiwan. The aftershocks show a fault-bend at a depth of 18 km. Coseismic ground displacements recorded by strong-motion records allow us to deduce instant rupturing of this event. Our resulting model shows a fault length of ∼33 km and dip-slip dominant rupture on fault-plane deeper than 18 km. Estimated coseismic displacements constrain two fault planes: one at 5-18 km depth dipping 60°E and 18-36 km depth dipping 45°E. The uppermost fault-plane of the Chihshang Fault (0-5 km) did not break immediately after the main shock; however, it may have a major role in after-slip and even interseismic ground deformation. The Taiyuan basin developed in the hanging wall is a geomorphic feature consistent with and adequately explained by coseismic ground displacements. Copyright 2006 by the American Geophysical Union.
Subjects
Deformation; Earthquake effects; Mathematical models; Seismology; Shock waves; Tectonics; Coseismic displacements; Fault rupture inversion; Interseismic ground deformations; Neotectonics; Earthquakes; crustal deformation; deformation mechanism; earthquake; Asia; Eurasia; Far East; Taiwan
Publisher
American Geophysical Union
Type
journal article