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

小行星9614448 这项研究是哥伦比亚和得克萨斯州A M大学之间的合作研究的失败过程中，新马德里地震带（NMSZ）的美国中部通过表征微震集群。 早期的分析将扩展到整个NMSZ的集群事件。 大多数簇位于中央节的扭结附近，或靠近该节与其他主要节的连接处。 空间/时间集群发生在4到10米的深度范围内。 9公里，显示走滑和逆滑震源机制，并位于附近和远离段结和扭结。 其目的是为聚类提供最佳物理模型，并进一步了解1）较大破裂的静态应力降与震源深度、震源机制和靠近或远离接合点的位置的关系，2）NMSZ中主要断层段之间的相互作用模式，例如地震或地震前滑沿着交叉断层段触发破裂，（3）流体在断裂过程中的作用。 这项研究是国家地震减灾计划的一个组成部分。 ***

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. ***