三维分块倾斜界面的反演及其应用

介绍了利用反射波走时反演介质层速度和包含直立断层的三维界面的计算方法．对各层界面利用多个倾斜或平界面方程来描述．给出了数值计算实例．结果表明，反演解与真模型很接近，说明计算方法是有效的．利用该方法处理了唐山地震区的ＰｍＰ反射波资料，获得了该区域莫霍界面的三维分块形态．唐山附近莫霍界面错断与该区域１９７６年唐山地震及一系列余震的发生有密切的联系．

INVERSION AND APPLICATION OF THREE DIMENSIONAL DIP INTERFACE IN BLOCK

A calculating method for inversing body wave velocities and three dimensional structure of interfaces by using reflected wave travel time is presented.A fast 3 D ray tracing algorithm by Chander and a damped least squares technique are used to solve forward and inversion problems respectively.The result shows that the solutions of inversion are close quite to the true model.A 3 D Moho interface structure in Tangshan earthquake region is constructed using P mP reflected wave data.The faults of Moho interface in Tangshan area and its vicinity are relative to the Tangshan main earthquakes and a series of aftershocks in 1976.