HR: 1400h
AN: G43B-01    [Abstracts]
TI: Fault geometry and slip distribution of the 10 December 2003 Taiwan Mw 6.5 earthquake from continuous GPS observations
AU: * Jin, S
EM: sgjin@shao.ac.cn; sg.jin@yahoo.com
AF: Shanghai Astronomical Observatory, CAS, No.80, Nandan Road, Shanghai, 200030, China
AU: * Jin, S
EM: sgjin@shao.ac.cn; sg.jin@yahoo.com
AF: Korea Astronomy and Space Science Institute, 61-1, Whaam-dong, Yusong-gu , Daejeon, 305-348, Korea, Republic of
AU: Chen, H
EM: chenhy@earth.sinica.edu.tw
AF: Institute of Earth Sciences, Academia Sinica, 128 Academia Road, Nankang, Taipei, 115, Taiwan
AU: Park, P
EM: phpark@kasi.re.kr
AF: Korea Astronomy and Space Science Institute, 61-1, Whaam-dong, Yusong-gu , Daejeon, 305-348, Korea, Republic of
AU: Ge, L
EM: l.ge@unsw.edu.au
AF: School of Surveying and SIS, University of New South Wales, Kensington, Sydney, NSW 2025, Australia
AB: Taiwan is located at the plate boundary zone between the Eurasian and the Philippine Sea plates where seismicity is extremely high. The MW 6.5 Chengkung earthquake occurred in eastern Taiwan at 04:38 UTC on 10 December 2003. In this paper, the GPS data collected from 18 continuously recording stations and 86 campaign stations are used to model the coseismic and postseismic deformation with the fault model in the elastic dislocation theory. It has been found that three-fault model can well show the reverse and lateral slip distribution. The inferred slip distribution indicates high slip patches near the epicenter. In addition, six months of postseismic time-series are better fit with a logarithmic instead of exponential function, suggesting that the postseismic deformation is possibly controlled by afterslip. Our inversion model predicts afterslip to be concentrated both up- and down-dip from patches of maximum coseismic slip where aftershocks are sparse. The afterslip distribution on the coseismic rupture plane is strongly dominated by reverse slip of the main center of coseismic reverse slip.
DE: 1209 Tectonic deformation (6924)
DE: 1242 Seismic cycle related deformations (6924, 7209, 7223, 7230)
DE: 1243 Space geodetic surveys
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
SC: Geodesy [G]
MN: 2007 Joint Assembly