Analysis of Northridge Earthquake Aftershock Recording (Near 94) to Explain Enhanced Damage Zones

分析北岭地震余震记录（近 94）以解释增强损坏区

• 批准号: 9416213
• 负责人: Paul Davis
• 金额: $ 5万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-01-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9416213&HistoricalAwards=false
• 关键词: Analysis; Northridge; Earthquake; Aftershock; Recording

9416213 Davis This research is to complete the archival and begin analysis of data from a 98 seismic station array installed immediately after the 1994 Northridge earthquake to explain the extreme damage from the main shock in Sherman Oaks and Santa Monica. Stations were clustered in the high damage zones as well as along two linear arrays that extended through the station clusters into the aftershock zone. One objective was to investigate whether the weak ground motion from the aftershocks could be used to understand the damage from the strong ground motion of the main shock, the question of strong-motion linearity. Over 300 aftershocks were recorded. Preliminary analysis reveals that badly damaged areas do indeed see large aftershock amplitudes relative to those of undamaged areas with some exceptions. This work seeks to analyze systematically the propagation from the hypocentral zone to the stations of the array to explain how propagation and site effects contribute to the damaging ground motion. Strong aftershock shaking will be compared with detailed maps of red-tagged zones provided by the LA City Council. This project is a contribution to the National Earthquake Hazard Reduction Program and is supported by the Northridge Earthquake Emergency Appropriation. ***

小行星9416213 这项研究是为了完成档案，并开始分析数据，从98个地震台阵列安装后，立即在1994年北岭地震，以解释极端的破坏，从主震谢尔曼奥克斯和圣莫尼卡。 地震站聚集在高破坏区，并沿沿着两个线性阵列延伸，通过地震站群进入余震区。 其中一个目的是研究余震产生的弱地面运动是否可以用来理解主震产生的强地面运动造成的破坏，即强地面运动线性问题。 记录了300多次余震。 初步分析表明，严重受损的地区确实看到了大余震振幅相对于那些未受损的地区，有一些例外。 本文旨在系统地分析从震源区到台阵各站的传播，以解释传播和场地效应对破坏性地震动的影响。 强烈的余震震动将与洛杉矶市理事会提供的红色标记区的详细地图进行比较。 该项目是对国家地震减灾计划的贡献，并得到北岭地震紧急拨款的支持。 ***