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.

成像技术通常用于医学领域，但尚未适用于地球研究。 特别重要的是对地震活动的研究，无论是自然发生的还是由人类活动引发的。 岩石力学界缺乏用于成像和评估岩体内地震活动潜力的可靠工具。 地震活动是由于挖掘深度增加和/或提取率增加而导致不稳定平衡的结果。 这两种现象都会导致高应力集中。 双差断层扫描是一项最近开发的技术，PI 已使用它来比以往更清晰地对岩体内的应力重新分布进行成像。 假设通过将对预期应力重新分布的理解（通过岩性测绘、实验室测试和数值模拟）与观测到的应力重新分布（来自双差层析成像）相结合，可以对随后的地震活动进行预测。 该项目将使用来自地下深处镍矿的数据来检验这一假设。 由于该项目基于一个非常新颖的假设，有可能改变现有的能力，因此该提案特别适合 NSF 探索性研究早期概念资助 (EAGER)。 一名研究生将获得项目资金的支持，研究结果将通过期刊论文和会议记录传播。