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本文简要介绍了已知DEM的二路差分的基本原理,并以西藏2004年7月12日仲巴地震为例,获取了仲巴地震的同震形变场。采用Okada弹性半空间位错模型反演了该地震的震源参数,得到了最佳震源机制解。结果表明:仲巴地震是以倾滑为主的右旋正断层型地震,断层面走向近乎南北方向(179°),倾角43,°深度13Km,三个方向的位移矢量分别为:-200mm、700mm和0mm。
In this paper, we briefly introduce the basic principle of the two-way difference of the known DEM. Taking the Zhongba earthquake on July 12, 2004 in Tibet as an example, the coseismic deformation field of the Zhongba earthquake was obtained. The Okada elastic half-space dislocation model was used to invert the source parameters of the earthquake and the best focal mechanism solution was obtained. The results show that the Zhongba earthquake is a dextral normal-fault-type right-earthquakes with a strike-slip direction of nearly 179◦, an inclination of 43◦ and a depth of 13 km. The displacement vectors of the three directions are -200 mm, 700mm and 0mm.