Temporal and Spatial Variations in Shear Wave Splitting, Seismic Coda Excitation and Micro-earthquake Clustering: San Jacinto and San Andreas Fault Zones, California

剪切波分裂、地震尾波激励和微地震集群的时空变化：加利福尼亚州圣哈辛托和圣安德烈亚斯断层带

• 批准号: 9706091
• 负责人: Gregory Wagner
• 金额: $ 5.77万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-11-01 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706091&HistoricalAwards=false
• 关键词: Temporal; Spatial; Variations; Shear; Wave

9706091 Wagner This research is to investigate the use of observations made at small-aperture three-component seismic arrays as a means of measuring spatial and temporal variations in subsurface properties in active fault zones. The motivation for this study is based on the premise that the increase in stress which is presumed to precede large to moderate sized earthquakes may lead to changes is seismic parameters. The parameters of particular interest for this study are shear wave splitting, seismic coda excitation and shear wave polarization. The data will be processed using a statistical array processing algorithm that provides high-resolution estimates of the frequency, wavenumber and polarization characteristics of the coherent arrivals observed at the array. This research is a component of the National Earthquake Hazard Reduction Program. ***

本研究旨在利用小孔径三分量地震阵列进行观测，作为测量活动断裂带地下性质时空变化的一种手段。这项研究的动机是基于这样一个前提，即假定在大到中等地震之前应力的增加可能导致地震参数的变化。本研究特别感兴趣的参数是横波分裂、地震尾波激发和横波极化。数据将使用统计阵列处理算法进行处理，该算法提供阵列观测到的相干到达的频率、波数和偏振特性的高分辨率估计。这项研究是国家减少地震危害计划的一个组成部分。＊＊＊