【摘要】 以15次地震资料为基础,回归得到断层上所有凹凸体地震矩与凹凸体面积的关系;研究经验格林函数方法中凹凸体子源的应力降,提出基于断层凹凸体理论的经验格林函数方法;以唐山地震余震(MS=6.9)作为经验格林函数,合成1976年唐山地震(MS=7.8)的地震动,比较合成结果与观测记录表明,该方法符合断层破裂过程,计算结果可靠.更多还原

【Abstract】 On the basis of the research on 15 earthquake, a relation between the seismic moments and the area of all asperities on seismic faults is worked out. The average stress drop of the asperities used for the empirical Green function (EGF) approach is generally obtained by linear regression analysis. A simplified EGF method based on the asperity model is proposed. A computer program based on this proposed method is developed to numerically synthesize the far-field seismic records of the 1976 MS7.8 Tangshan earthquake. The accelerograms of the Tangshan earthquake at Guanting station are synthesized by using an MS6.9 aftershock record as the Green function. Comparison of the camputed accelerogram with the observation shows that the numerical result obtained in this paper is accurate and reliable.更多还原