三维地质模型中的地震定位初步研究  

Earthquake location in 3D geological models

作　　者：李飞 韩颜颜[1] 安艳茹[1] 梁姗姗[1] 何少林[1] 

机构地区：[1]中国地震台网中心,北京100045

出　　处：《国际地震动态》2017年第10期26-31,共6页Recent Developments in World Seismology

基　　金：国家自然科学基金项目(41604054);中国地震台网中心青年科技基金课题(164040132051906;17404031570511)联合资助

摘　　要：快速精确地确定震源位置和发震时刻是地震速报及地震预警的前提和基础,可以为地震应急、震后救援及地震趋势预测等提供重要科学依据。传统的定位方法由于通常基于简单一维地球模型,对地下结构复杂区域地震事件定位误差较大。本研究采用块状结构建模方案来描述三维复杂地质体,发展了相应的逐段迭代射线追踪方法实现走时的快速正演计算;采用阻尼最小二乘方法,计算了走时对震源三维空间位置的偏导数,为实现三维地质模型中的地震定位研究奠定了基础。Rapid and accurate determination of the source location and time of earth-quake is the premise and foundation of earthquake fast report and early warning, and can also provide scientific basis for the earthquake emergency, post-earthquake relief and earthquake tendency prediction. Traditional earthquake location methods are usually based on simple earth models, which cause relative large errors, especially in the areas with complex struc-tures. We adopt block modeling and use a set of blocks to describe 3D complex geological models, and develop a corresponding segmentally iterative ray tracing method to calculate the ray paths and travel time. A damped least squares method is employed in the inversion proce-dure, and the partial derivatives of travel time with respect to the location of the earthquake source in the z directions are derived. This research is the foundation of earthquake lo-cation method in the 3D heterogeneous models.

关 键 词：三维 块状模型 射线追踪 地震定位 

分 类 号：P315[天文地球—地震学]