Some simplified hypocenter models are presented for explaining an im-portant effect of environmental stiffness,which includes the axial and the lateral stiffness and that of fault zone tips,on shock generation pro-cess of hypocenter.Besides the strength condition,the environmental stif-fness condition is another one necessary for shock-generation.The effect of environmental stiffness may reduce the magnitude of mean stress drop in hypocenter to the order of 102 or even 10 Mpa,and the lower stress drop may occur at higher confining pressure.Some problems are discuss-ed:two different kinds of locking segments on fault zone-the potential “seismic core”and the“tip”which constrains shock-generasion;two pos-sible effects of water injecting into different parts of hypocenter region- inducing or preventing strong earthquake;the relation between the geome-tric parameters of environmental stiffness and the distribution of seismic intensity.
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王绳祖,施良骐,张流.震源错动带端部的刚度效应[J].地震工程学报,1985,7(1):20-28. Wang Shengzu, Shi Liangpi, Zhang Liu. STIFFNESS EFFECT OF FAULT ZONE TIP IN HYPOCENTER[J]. China Earthquake Engineering Journal,1985,7(1):20-28.