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On the Role of Load and Pore Pressure Diffusion in the Triggering of Seismicity at Monticello Reservoir

荷载和孔隙压力扩散在蒙蒂塞洛水库地震活动触发中的作用

基本信息

批准号：
8804365
负责人：
Pradeep Talwani
金额：
$ 3.75万
依托单位：
University of South Carolina at Columbia
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1988
资助国家：
美国
起止时间：
1988-06-01 至 1991-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8804365&HistoricalAwards=false
关键词：
Role Load Pore Pressure Diffusion

项目摘要

The proposed studies are aimed at studying the relative roles of loading with accompanying elastic pore pressure increase and pore pressure diffusion in triggering seismicity at Monticello Reservoir, S.C. following its impoundment. Monticello is unique in that extensive geological, geophysical, and seismological studies were conducted prior to, during, and after filling, making this one of the best studied cases of reservoir induced seismicity in the world. Determination of the relative roles of loading and pore pressure diffusion requires analyses of accurate spatial and temporal patterns of well located earthquakes together with the induced stresses and pore pressure changes which occurred during filling. As the geology at the site is extremely heterogeneous, development of a three dimensional velocity model is necessary to obtain accurate hypocentral locations. We propose to develop such a model by inversion of high quality local earthquake phase data within constraints imposed by detailed geological and geophysical data. Relocation of initial seismicity using the improved velocity model will provide an accurate spatial and temporal history of the activity. From a comparison of these patterns with that of the load induced stresses it will be possible to differentiate the relative roles of loading and pore pressure diffusion in triggering the seismicity at Monticello Reservoir. The results of these studies will be directly applicable to the control of RIS associated with reservoirs worldwide.

拟议的研究旨在研究相对作用加载伴随弹性孔隙压力增加，蒙蒂塞洛地震活动触发中的孔隙压力扩散南卡罗来纳州水库在它的蓄水之后。蒙蒂塞洛是独一无二的在广泛地质学、地球物理学和地震学中，在灌装前、灌装期间和灌装后进行了研究，这是对水库诱发地震的最好研究案例之一世界上确定载荷和孔隙的相对作用压力扩散需要精确的空间分析，地震的时间模式以及引起的应力和孔隙压力的变化，填充。由于该地点的地质极为复杂，必须建立三维速度模型，获得准确的震源位置。我们建议发展这样的高质量当地震相数据反演模型在详细的地质和地球物理条件限制下，数据利用改进的速度模型将提供准确的空间和时间活动的历史。从这些模式的比较，在载荷引起的应力中，区分荷载和孔隙压力的相对作用扩散在触发蒙蒂塞洛水库地震活动中的作用。这些研究的结果将直接适用于控制与全球水库相关的RIS。