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In Situ Measurements of the Mechanical Properties of Active Fault Zones

活动断裂带力学特性的现场测量

基本信息

批准号：
0001116
负责人：
Duncan Carr Agnew
金额：
$ 2.21万
依托单位：
University of California-San Diego Scripps Inst of Oceanography
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2000
资助国家：
美国
起止时间：
2000-06-15 至 2002-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0001116&HistoricalAwards=false
关键词：
Situ Measurements Mechanical Properties Active

项目摘要

Agnew, Duncan CarrEAR-0001116This proposal requests funds to support the continued operation of a portable laser strainmeter adjacent to the southern San Andreas fault and co-located with a fully anchored laser strainmeter. The investigator had planned to pull out the portable instrument in the fall of 1999, but is requesting funds to continue to operate the instrument because over the last six months a number of unusual strain events have been observed. First, there has been observed several aseismic but rapid strain changes which are unlike the previous behavior of the strain record since 1994. Second, there has been observed the postseismic response to the Mw 7.1 Hector Mine earthquake of 17 October 1999. This earthquake triggered a swarm of earthquakes adjacent to the southern termination of the San Andreas fault, near the strainmeters, leading to genuine concern over the possibility of accelerating deformation in the area. Given the current level of activity, it is very likely that continued operation of this instrument will detect further such events. Understanding better where, and perhaps how, these events occur should provide important information on fault mechanics in general and about the behavior of the San Andreas fault at its southern end: one end of that segment of the San Andreas which has the longest elapsed time since the last large earthquake.

阿格纽，Duncan CarrEAR-0001116本提案要求资金支持在圣安德烈亚斯断层南部附近的便携式激光应变仪的继续运行，并与完全锚定的激光应变仪位于同一地点。调查员原计划在1999年秋季取出便携式仪器，但由于在过去六个月中观察到了一些不寻常的紧张事件，因此要求提供资金以继续操作该仪器。首先，已经观测到了几次无地震但快速的应变变化，这与1994年以来应变记录的先前行为不同。其次，观测到了1999年10月17日赫克托煤矿7.1兆瓦地震的震后响应。这场地震引发了圣安德烈亚斯断层南端附近的一系列地震，靠近应变仪，导致人们真正担心该地区可能加速变形。鉴于目前的活动水平，这一仪器的继续运行很可能会检测到更多此类事件。更好地了解这些事件发生的地点，或许是如何发生的，应该提供有关一般断层力学以及圣安德烈亚斯断层南端行为的重要信息：圣安德烈亚斯断层南端的一端是自上次大地震以来经过时间最长的那段。