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The changing Characteristics of Seismic Correlation Length before Wenchuan M8.0 Earthquake

RONG Dai-lu,LI Ya-rong(Lanzhou Institute of Seismology,CEA,Lanzhou 730000,China)  
The time-space evolution of seismic correlation length before Wenchuan M8.0 earthquake is analyzed.We use ellipse which long axis is coincident with the strike of main fault belt in source area as the spatial window in analyzing on growing correlation length,and design the corresponding optimization procedure.The result shows that the growing correlation length before Wenchuan earthquake could be observed,and the significance of result is tested by the random synthetic seismic catalog.The result rejects the null hypothesis for the catalog and shows that the observed patterns are not a consequence of random fluctuations,with 93.9% confidence levels.
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