地震综合前兆场建场方法初探

PRELIMINARY STUTY ON THE METHOD BUILDING COMPREHENSIVE SEISMIC PRECURSORY FIELD

摘要:

初步建立了一种能反映地震前兆时空演化全貌的无量纲、归一化可迭加的信息场——综合前兆场.通过对研究区(东经113°~125°,北纬32°~44°)前兆场时空演化过程的分析发现,地震前前兆场由正常的低值离散逐渐发展为围绕震中呈高值封闭状态,震后恢复正常.该方法的独特之处在于,避开了某些单项异常对应某具体源的分析,而是只考虑异常.根据前兆场的变化可以确定震源的大致位置.

Abstract:

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.