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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Kinematics of the 2015 San Ramon, California earthquake swarm: Implications for fault zone structure and driving mechanisms
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Kinematics of the 2015 San Ramon, California earthquake swarm: Implications for fault zone structure and driving mechanisms

机译:2015年2015年San Ramon的运动学,加利福尼亚州地震群:故障区结构和驱动机制的影响

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摘要

Earthquake swarms represent a sudden increase in seismicity that may indicate a heterogeneous fault-zone, the involvement of crustal fluids and/or slow fault slip. Swarms sometimes precede major earthquake ruptures. An earthquake swarm occurred in October 2015 near San Ramon, California in an extensional right step-over region between the northern Calaveras Fault and the Concord-Mt. Diablo fault zone, which has hosted ten major swarms since 1970. The 2015 San Ramon swarm is examined here from 11 October through 18 November using template matching analysis. The relocated seismicity catalog contains similar to 4000 events with magnitudes between -0.2 M-d 3.6. The swarm illuminated three sub parallel, southwest striking and northwest dipping fault segments of km-scale dimension and thickness of up to 200 m. The segments contain coexisting populations of different focal-mechanisms, suggesting a complex fault zone structure with several sets of en echelon fault orientations. The migration of events along the three planar structures indicates a complex fluid and faulting interaction processes. We searched for correlations between seismic activity and tidal stresses and found some suggestive features. but nothing that we can be confident is statistically significant. (C) 2018 Elsevier B.V. All rights reserved.
机译:地震群代表了可能表示异质断层区的地震性的突然增加,地壳流体的累积和/或慢速滑倒。群有时会在大地震裂缝之前。地震群体于2015年10月发生在加利福尼亚州圣拉蒙州圣拉蒙斯,在北兰瓦拉斯故障和Concord-Mt之间的一个延伸右滞后区域。自1970年以来,暗黑破坏神断路区举办了十大大块。2015年10月11日至11月18日在此,使用模板匹配分析检查了2015年San Ramon Swarm。重新定位的地震性目录包含类似于4000个事件,其中幅度在-0.2°之间。 M-D& 3.6。群体照亮了三个副平行,西南撞击和西北倾倒故障段的KM尺度尺寸和厚度高达200米。这些段包含不同焦点机制的共存群体,建议具有多组EN echelon故障方向的复杂断层区域结构。沿三个平面结构的事件迁移表示复杂的流体和故障相互作用过程。我们搜索了地震活动与潮气应力之间的相关性,发现了一些暗示特征。但我们可以自信的是没有统计学意义。 (c)2018年elestvier b.v.保留所有权利。

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