考虑地震位错引起的大地水准面形变的源参数反演

SOURSE PARAMETER INVERSION BASED ON GEOIDAL DEFORMATION RESULTING FROM EARTHQUAKE DISLOCATION

本文首先讨论了地震位错引起的参考系,即大地水准面形变问题.给出了位错引起的大地水准面高和垂线偏差的变化,以及大地水准面高随位错面倾角变化等数值结果. 在进一步考虑大地水准面形变的条件下,给出用表面视位移和重力变化资料反演位错模型参数的处理方法,以及用于确定唐山地震源参数和大地水准面高的变化的实例.研究结果表明,在使用大地测量资料进行地震位错模型参数反演时,考虑大地水准面形变不仅在理论上更加严格,而且在实际应用中也确有意义.

In this paper we have discussed the deformation of reference system,i.e.,thegeoid,due to earthquake dislocation and have given some numerical results on changesof the geoidal height and the deflection of vertical and variations of the geoidal height with dip angles of the dislocation plane.In the presence of the geoida] deformation we have further presented a method treating inversion of source parameter of earthquake dislocation with data of apparent displacement and gravity change on the ground and applied it for determining sourse parameters and changes of geoidal height for the Tangshan earthquake.The results indicate that based on geodetic data inversion of source parameters of earthquake dislocation model is not only theoretically serious,but also practically significant.