Rapid 3-D Earthquake Location using a Hybrid Global–Local Inversion Approach
Rapid 3-D Earthquake Location using a Hybrid Global–Local Inversion Approach
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DOI：
10.1007/s00024-010-0102-4
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发表时间：
2010-03
影响因子：
2
通讯作者：
Chao-ying Bai;Rui Zhao;S. Greenhalgh
中科院分区：
文献类型：
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作者：
Chao-ying Bai;Rui Zhao;S. Greenhalgh
提出了一种基于最小搜索例程的粗糙全局搜索和精细局部反演相结合的地震定位方法。该方法利用网络光线追踪和fr<s:1>衍生物鲁棒化的优点，同时更新解空间中所有采样的初始源参数，以确定最佳解。综合实例，包括三维（3-D）复杂速度模型和具有挑战性的源接收器布局，用于证明在解决精度，计算效率和对噪声的敏感性方面优于直接网格搜索算法。因此，该方案在地震预警、海啸预警、快速灾害评估、强震应急响应等方面具有广阔的应用前景。
A novel hybrid approach to earthquake location is proposed which uses a combined coarse global search and fine local inversion with a minimum search routine. The method exploits the advantages of network ray tracing and robust formulation of the Fréchet derivatives to simultaneously update all sampled initial source parameters in the solution space to determine the best solution. Synthetic examples, involving a three-dimensional (3-D) complex velocity model and a challenging source–receiver layout, are used to demonstrate the advantages over direct grid search algorithms in terms of solution accuracy, computational efficiency, and sensitivity to noise. Therefore, this is a promising scheme for earthquake early warning, tsunami early warning, rapid hazard assessment, and emergency response after strong earthquake occurrence.