Collaborative Research: Seismic Failure Processes of Intersecting Intraplate Faults Using Microearthquake Clusters

合作研究：利用微震群研究板内相交断层的地震破坏过程

• 批准号: 9614448
• 负责人: Jiakang Xie
• 金额: $ 7.52万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-03-01 至 2001-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9614448&HistoricalAwards=false
• 关键词: Collaborative; Research; Seismic; Failure; Processes

9614448 Xie This research is for collaborative research between Columbia and Texas A&M Universities on the failure processes in the New Madrid Seismic Zone (NMSZ) of the Central U.S. through characterization of microearthquake clustering. Earlier analysis is to be extended to clustered events throughout the NMSZ. Most clusters are located near the kink in the central segment, or near the junctions of that segment with other major segments. The spatial/temporal clusters occur over a range of depths of 4 to 9 km, display both strike and reverse slip focal mechanisms, and are located both near and away from the segment junctions and the kink. The goal is to provide the best physical model for the clustering and give additional insight into 1) the relation of the static stress drops of the larger ruptures to focal depths, focal mechanisms, and locations near or away from the junctions, 2) the mode of interactions among major fault segments in the NMSZ, such as triggering of ruptures by seismic or aseismic preslip along intersecting fault segments, and 3) the role of fluid involvement in faulting processes. This research is a component of the National Earthquake Hazard Reduction Program. ***

本研究是哥伦比亚大学和德克萨斯a&m大学合作研究美国中部新马德里地震带（NMSZ）的破坏过程，通过表征微震聚集。先前的分析将扩展到整个NMSZ的群集事件。大多数簇位于中心节段的扭结附近，或靠近该节段与其他主要节段的连接处。空间/时间集群发生在4至9公里的深度范围内，显示走滑和逆滑震源机制，并且位于段连接处和扭结附近和远离处。目标是为聚类提供最佳的物理模型，并进一步深入了解1)大断裂的静态应力降与震源深度、震源机制和靠近或远离接点的位置的关系；2)NMSZ主要断层段之间的相互作用模式，例如沿相交断层段的地震或地震预滑触发破裂；3)流体参与断层过程的作用。这项研究是国家减少地震危害计划的一个组成部分。＊＊＊