HR: 1400h
AN: G33B-07    [Abstracts]
TI: Study of a Gravity Precursor mode of the Lijiang Earthquake with Ms7.0
AU: * Shen, C
EM: lihuidz@public.wh.hb.cn
AF: Institute of Seismology, CSB, Institute of Seismology, CBS, Wuhan, 430071, China
AU: Li, H
EM: lihuidz@public.wh.hb.cn
AF: Institute of Seismology, CSB, Institute of Seismology, CBS, Wuhan, 430071, China
AB: In order to analyses the earthquake pregnant process or the precursory behavior before the 1996 Lijiang earthquake with Ms7.0 occurred�Cin this paper, we make the best of the high precision repeat gravity observation data in the experiment field, western Yunnan, combine with the related geological survey and geophysical results�Cand take account of the gross errors caused by data observation and models difference, we first adopt the robust Baye�fs least squares estimation and multi-fault dislocation models to invert and obtain the time slip distribution of the main active faults in the study region. The results show that the time changes of faults slip during 1990 to 1997 are good reflected the earthquake pregnant process of the 1996 Lijiang earthquake with Ms7.0, the picture of main precursor mode has the characteristic of main shock- after shock type and follow the mode of coupling movement between crust density and crust deformation (in a word, name it as DD mode of coupling movement). Keyword Lijiang earthquake precursor mode repeat gravity time changes of faults slip
DE: 1200 GEODESY AND GRAVITY
DE: 1211 Non-tectonic deformation
DE: 1217 Time variable gravity (7223, 7230)
DE: 1219 Gravity anomalies and Earth structure (0920, 7205, 7240)
DE: 7223 Earthquake interaction, forecasting, and prediction (1217, 1242)
SC: Geodesy [G]
MN: 2007 Joint Assembly