3-D Crustal P and S Velocities in Southern California and Their Seismological and Tectonic Implications

南加州 3-D 地壳 P 和 S 速度及其地震学和构造意义

• 批准号: 9218704
• 负责人: Hua-Wei Zhou
• 金额: $ 12.26万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-01 至 1996-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218704&HistoricalAwards=false
• 关键词: Crustal; Velocities; Southern; California; Their

This research will map the 3-D P- and S-wave velocity structures in the crust of southern California by tomographically inverting over 1.5 million P- and S-wave first-arrival times from over 80,000 local events recorded by the Caltech/USGS network since 1981. The massive data size and the demand for a full 3-D raytracing due to known large lateral inhomogeneities in the crust have imposed a major computational challenge to conventional methods. By an innovative Master Station Method of incorporating 3-D ray tracing, however, the P and S structures will be imaged simultaneously in this project with relocation of summarized events. The primary objectives are to construct P and S crustal velocity models for southern California at one order higher resolution than the latest P velocity model, to relocate earthquakes and re-examine first- motion focal mechanisms in areas of large bias by routine processing, and to gain insight into the crustal seismo-tectonic processes through integrated analysis of all known geophysical and geological information. This research is a component of the National Earthquake Hazard Reduction Program.

本研究将绘制三维纵、横波速度结构图 在南加州的地壳中， 超过150万个P波和S波初至时间， 加州理工学院/美国地质勘探局网络自1981年以来记录的当地事件。 的 大量的数据大小和对完整的三维光线跟踪的需求， 已知的地壳中的大的横向不均匀性造成了 对传统方法的主要计算挑战。 由 创新的主站方法， 然而，P和S结构将同时成像， 这个项目与搬迁的总结事件。 主 目的是建立P和S地壳速度模型， 加州南部的分辨率比最新的高一个数量级 P速度模型，重新定位地震和重新审查第一- 常规大偏差区域的运动聚焦机制 处理，并深入了解地壳地震构造 通过综合分析所有已知的地球物理和 地质信息 这项研究是一个组成部分， 国家地震减灾计划。