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《Chinese Journal of Geophysics》 1999-05
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RELATIONSHIP BETWEEN THE DEEP CRUSTAL FEATURES IN VELOCITY STRUCTURE AND THE PREPARATION OF STRONG EARTHQUAKES INXINGTAI AREA

YIN JING-YUAN;MEI SHI-RONG;XUE YAN(Center for Analysis and Prediction, CSB. Beijing 100036, China)  
This paper deals with the effect of the inhomogeneity of the crustal structure onthe stress field by using 3-D finite element method. The variations in mean stress andin horizontal shear stress for a layered crust model are calculated under conditionswith a high velocity body; a low velocity body; and a combined high-low velocitybody in the model respectively. The cormsponding results indicate that (l) the stressconcentration due tO the existence of the high velocity body can reach very highvalues on the corners and the borders of the body, which would be favorable for theearthquake preparation, (2) it is not easy to form a strong earthquake within andnearby the low velocity body, where high enough stress could not be accumulated,and (3) the existonce of a combined high-low velocity body might play an importantrole in forming higher stress concentraton within the high velocity body and relativehigh stress concentration in some places out of the high velocity body, which wouldbe advantageous to the earthquake preparation. The calculation results coincide quitewell with the spacial distribution of Xingtai earthquake sequence.
【Fund】: 中国地震局“九五”科技攻关项目
【CateGory Index】: P315.1
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