Geotechnical Experimentation Planning Committee for Treasure Island, CA, Deep Instrumentation Array

加利福尼亚州金银岛岩土工程实验规划委员会，深层仪器阵列

• 批准号: 9817701
• 负责人: Pedro de Alba
• 金额: $ 10.74万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-10-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9817701&HistoricalAwards=false
• 关键词: Geotechnical; Experimentation; Planning; Committee; Treasure

The Treasure Island, California, deep instrumentation array is currently one of the most heavily-instrumented and best-characterized installations in the United States for measuring the effects of strong motion earthquakes. It is located in San Francisco Bay, between the San Andreas and the Hayward faults. In 1990, the aggregate probability of an event of magnitude 7 or greater on or the other of these faults was estimated at 67% over the subsequent 30 years; newer information may cause this estimate to be revised upward.The site was established in 1991-1992 by the National Science Foundation to directly measure the non-linear response of a deep soil profile to strong ground shaking. The site consists of an 86 meter deep soft soil profile over bedrock. Similar soil conditions exist under large parts of the San Francisco Bay Area and in other cities with a similar earthquake risk. The Island is in the process of being transferred by the US Navy to the City of San Francisco, which strongly supports the continued existence of this array. Instrumentation is maintained by the California Strong Motion Instrumentation Program, which is also committed to publishing the strong-motion data.This action is to establish a committee to oversee the operation of this array and the use of this site for research in earthquake hazard mitigation. The committee is to be composed of seismologists and geotechnical engineers from academia, government agencies, and private practice. This committee will review critically the state of the site characterization and instrumentation, define experiments that could be performed at this site, and serve as the primary point of contact for investigators wishing to undertake experiments at this site.

加利福尼亚州金银岛的深度仪器阵列是目前美国测量强震影响的仪器最多、特点最好的设备之一。它位于旧金山湾，圣安德烈亚斯断层和海沃德断层之间。1990年，在接下来的30年里，这些断层上或其他断层上发生7级或更大级别地震的总概率估计为67%；更新的信息可能会导致这一估计被向上修正。该站点由美国国家科学基金会于1991-1992年建立，目的是直接测量深层土壤剖面对强烈地面震动的非线性响应。该场地由基岩上方86米深的软土剖面组成。类似的土壤条件存在于旧金山湾区的大部分地区和其他有类似地震风险的城市。该岛正在被美国海军移交给旧金山市，旧金山市强烈支持这一阵列的继续存在。仪器由加州强震仪器计划维护，该计划也致力于公布强震数据。这一行动是为了建立一个委员会，监督该阵列的运行和使用该地点进行地震减灾研究。该委员会将由来自学术界、政府机构和私人执业的地震学家和岩土工程师组成。该委员会将严格审查现场特征和仪器的状况，确定可以在该地点进行的实验，并作为希望在该地点进行实验的调查人员的主要联络点。