Determination of the Upper Mantle Structure Beneath Southern California Using Long-Period Love and Rayleigh Waves Recorded at TERRAscope Stations

利用 TERRAscope 站记录的长周期洛夫波和瑞利波确定南加州下方的上地幔结构

• 批准号: 9204748
• 负责人: Hiroo Kanamori
• 金额: $ 9.55万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-15 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204748&HistoricalAwards=false
• 关键词: Determination; Upper; Mantle; Structure; Beneath

This research is to use long-period surface waves recorded at the TERRAscope (the very-broadband seismic network recently installed in southern California by the California Institute of Technology) to determine phase velocities in southern California. A well established method will be applied to these modern high-quality data. The period range of the previous measurements was limited to 27 seconds because of the limited quality of data. The new data set will extend the period range to 150 seconds. The increased period is critically important for exploring deep structures, that is, to a depth of 200 km. A better knowledge of these deep structures in the upper mantle will help understand the dynamics that controls the seismic activity and tectonic deformation presently taking place in southern California. This research is a component of the National Earthquake Hazard Reduction Program.

这项研究是利用TERRASCOPE(加州理工学院最近在南加州安装的甚宽带地震网络)记录的长周期面波来确定南加州的相速度。一种成熟的方法将应用于这些现代高质量数据。由于数据质量有限，以前测量的周期范围被限制在27秒内。新的数据集将把周期范围扩大到150秒。增加的周期对于勘探深部构造至关重要，即深度达到200公里。更好地了解这些上地幔的深部结构将有助于理解控制加州南部目前发生的地震活动和构造变形的动力学。这项研究是国家减少地震灾害计划的一部分。