EAGER: Forecasting Subsequent Seismicity using Double-Difference Tomography

EAGER：使用双差层析成像预测后续地震活动

• 批准号: 1051111
• 负责人: Erik Westman
• 金额: $ 4.99万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1051111&HistoricalAwards=false
• 关键词: EAGER; Forecasting; Subsequent; Seismicity; using

Imaging technologies are routinely used within the medical field yet have not been adapted for use in the study of the earth. Of particular consequence is the study of seismicity, either naturally occurring or triggered by human activity. The rock mechanics community lacks a well-founded tool for imaging and assessing the potential for seismicity within a rock mass. Seismicity is a result of unstable equilibrium due to increased depth of excavation and/or increased extraction ratio. Both of these phenomena result in high-stress concentrations. Double-difference tomography, a recently developed technology, has been used by the PI to image stress redistribution within a rock mass more clearly than ever before. It is hypothesized that by combining an understanding of expected stress redistribution (through lithologic mapping, lab testing, and numerical modeling) with observed stress redistribution (from double-difference tomography) a forecast of subsequent seismicity can be made. This project will test this hypothesis using data from a deep, underground nickel mine. Because this project is based upon a very novel hypothesis that has potential to transform existing abilities, the proposal is particularly well-suited for an NSF Early-concept Grant for Exploratory Research (EAGER). One graduate student will be supported by project funding and results will be disseminated through journal papers and conference proceedings.

成像技术通常在医学领域内使用，但尚未适应地球研究。 特别结果是对人类活动的自然发生或触发的地震性研究。 岩石力学界缺乏一个有充分的成像工具，并评估了岩石质量内的地震性的潜力。 地震性是由于挖掘深度增加和/或提取比增加而导致平衡不稳定的结果。 这两种现象都会导致高压力浓度。 PI比以往任何时候都更清楚地对岩石质量中的应力重新分布来对应力重新分布进行了两种差异断层扫描。 假设，通过将对预期应力再分配（通过岩性映射，实验室测试和数值建模）结合在一起，可以预测对随后的地震性的预测。 该项目将使用来自深层地下镍矿的数据检验该假设。 因为该项目基于一个非常新颖的假设，该假设有可能改变现有能力，因此该提案特别适合NSF早期概念概念授予探索性研究（急切）。 一名研究生将得到项目资金的支持，结果将通过期刊论文和会议程序传播。