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双差分地震定位法采用了一维射线追踪法和直角坐标系,不适合于复杂速度模型中的地震定位.本研究采用三维射线追踪技术和球坐标系改进了双差分定位法,扩大了它的应用范围.为了检验新方法的可行性和准确性,以日本海地区下方的深发地震为研究对象,通过对比4种复杂速度模型中双差分定位结果,分析速度结构对双差分定位的影响.结果表明,改进后的双差分定位法受速度结构变化的影响较小,而且当震源区的速度模型越接近真实速度结构时,定位结果的精度越高,这为利用深发地震研究地球深部构造奠定了基础.
One-dimensional ray-tracing method and Cartesian coordinate system are used in the dual-differential seismic location method, which is not suitable for the seismic location in the complex velocity model.In this study, the double-differential location method is improved by using the 3D ray tracing technique and the spherical coordinate system, Application range.In order to test the feasibility and accuracy of the new method, taking the deep-seated earthquake below the Japan Sea region as the research object, the influence of velocity structure on the double-difference localization is analyzed by comparing the double-difference localization results of the four complex velocity models. The results show that the improved double differential localization method is less affected by the change of velocity structure. And when the velocity model in the source region is closer to the true velocity structure, the accuracy of the positioning result is higher. This is a good method to study deep structure of the earth by deep- Foundation.