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PRELIMINARY STUTY ON THE METHOD BUILDING COMPREHENSIVE SEISMIC PRECURSORY FIELD

XIA Yusheng (Seismological Bureau of Qinghai Province,Xining 810001) LIANG Zibin CAI Hongwei ZHANG Hui (Earthquake Research Institute of Lanzhou,SSB,Lanzhou 730000) YANG Liping ZHANG Min (Seismological Bureau of Qinghai Province,Xining 81000  
In this paper,the authors build preliminarily comprehensive precursory field reflecting the time space evolution of seismic precursors,which is a non dimensional,normalized and stacking information field.Analysing the process of the time space evolution of the precursory field in the research area(113°~125°E,32°~44°N),the result shows that the field develops gradually from normally low value scatting to high value confining around the epicenter before the earthquake,and recovers normally after the earthquake.The unique feature of the method is that the analysis on the certain single precursor corresponding to the certain source is avoided,and only analysing the anomalies,location of the focus can be found from the field on the basis of the comprehensive stacking information.
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