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为了建立断层蠕动与其周围地壳形变的关系,本文给出了线性粘弹性半空间中任意倾角的断层滑动引起的准静态位移场的完整的解析表达式.其中,滑动时间函数的形式是根据经验拟定的,而介质被视为广义开尔文体或麦克思韦体.通过数值计算讨论了介质的流变性对位移场的影响.根据1976年唐山地震前后在地震区取得的短期观测资料的分析,论证了唐山主震前夕在极震区地壳上部曾发生过前兆蠕动,而且主震后断层仍继续滑动,但其速率呈指数型衰减.估算了符合观测数据的断层滑动参数,并对这些结果的意义作了简要的讨论.
In order to establish the relationship between the fault creep and the crustal deformation around it, a complete analytical expression of quasi-static displacement field caused by fault slip with arbitrary dip in linear viscoelastic half-space is given. The sliding time function is derived from experience , And the medium is considered as a general Kelvinian or a Maxwell body.The effects of the rheological properties of the medium on the displacement field are discussed numerically.According to the analysis of the short-term observation data obtained before and after the Tangshan earthquake in 1976, On the eve of the Tangshan mantle, precursor creep occurred in the upper crust of the extremely shock zone, and the fault continued to slide after the main shock with exponential decay rate. The fault sliding parameters were estimated in line with the observed data and the significance of these results A brief discussion.