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《Acta Seismologica Sinica》 2010-06
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Variation of multiple seismicity parameters used to investigate critical behavior of the Wenchuan earthquake preparation

Xie Chaodi1,2), Zhu Yuanqing1,3) Lei Xinglin2) Song Zhiping3) 1) Reflection Seismic Research Group, School of Ocean & Earth Science, Tongji University, Shanghai 200092, China2) Geological Survey of Japan, AIST, Tsukuba 305-8567, Japan3) Earthquake Administration of Shanghai Municipality, Shanghai 200062, China  
On the basis of analyzing multiple statistical parameters,including cumulative energy release,b-value,spatial correlation length and fractal dimension,temporal variation of regional seismic activity before the 2008 Wenchuan earthquake and its large aftershocks were studied with time scanning approach. Some abnormal variations are found,including obvious increase of cumulative energy release,decrease of spatial correlation length and fractal dimension,and appearance of low b-value. A similar characteristics is found in aftershock activity. The result of this study indicates that using multiple seismic parameter analysis we can trace back the critical state of the Wenchuan earthquake preparation.
【Fund】: 国家“973”项目(2008CB425704);; 科技部科技基础性工作专项(2007FY220100)共同资助
【CateGory Index】: P315.5
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