中文摘要：

介绍了一种基于地震波射线理论、不需要先验速度结构的定位震源空间位置的方法——射线追踪法。该方法利用地震射线会反向汇聚到震源的几何性质,对地面介质分层,并用网格搜索反演方法计算分层速度参数,进而确定震源位置;然后逐步增加分层,重复前面的步骤,对震源位置进行校正,最终得到一个较为精确的定位结果。通过虚拟事件对该方法进行了测试,测试结果表明,该方法理论上能够用于近震空间位置的定位;使用该方法对一个真实震侧进行定位,并和云南地震台网的定位的结果进行了比较,两者较为接近。

英文摘要：

We demonstrate a ray tracing method for earthquake locating without prior velocity structure, which is based on ray theory. As the seismic ray focus on the hypocenter, first we divide the layer into sub - layers, and compute the velocities of the sub - layers and the location of the hypocenter by grid - search ; then we increase the number of the sub - layers step by step, and repeat the process before correcting the hypocenter location ; at last, we get a more accurate result. Simulative data have been used to test the method, the results show that, this method can be used for earthquake location in theory. We use this method to locate a natural earthquake. In contrast with the location result of Yunnan Seismic Network, we find the two results are close.