Dynamic triggering of shallow slip on forearc faults constrained by monitoring surface displacement with the IPOC Creepmeter Array

Dynamic triggering of shallow slip on forearc faults constrained by monitoring surface displacement with the IPOC Creepmeter Array
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通过使用 IPOC 蠕变计阵列监测地表位移来动态触发弧前断层上的浅滑移

DOI:
10.1016/j.epsl.2018.08.046
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发表时间:
2018
影响因子:
5.3
通讯作者:
O. Oncken
O. Oncken
中科院分区:
地球科学1区
文献类型:
--
作者:
Victor P;M. Sobiesiak;G. Gonzalez;M. Kempter;T. Ziegenhagen;O. Oncken

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2010年2月27日发生的Mw=8.8 Maule地震,在距离震中1500-1800公里的智利北部阿塔卡马断裂系统发生了远程触发的地表微小位移。在这里,我们提出的证据表明,由IPOC(智利北部综合板块边界观测站)蠕变仪阵记录的地表位移事件与俯冲带界面上的地震或世界各地的大地震有关。我们的观察记录了弧前背景下断层上浅层滑动的动态触发。连续监测显示,在监测的断层段上每年发生多达30次位移事件,其中90%是由与地震波传播同步的近场或远场地震触发的。我们可以清楚地将远场触发归因于面波的传播,而近场的触发归因于体波的传播。监测到的最远的触发位移事件发生在2011年之后,Mw=9.0东北冲绳地震发生在16468公里外,伴随着大幅度SS波的通过。将所触发的位移事件与地震活动、火山喷发、水文变化等其他触发现象以及加利福尼亚爬行仪阵列的数据进行比较,发现地震能量密度较好地描述了滑动触发的震级-距离标度关系。最后,观测到的地表位移不是通过连续蠕变发生的,而是通过几乎完全离散的位移事件发生的。
Abstract The M w= 8.8 Maule Earthquake of February 27, 2010, remotely triggered minor surface displacement along the Atacama Fault System in Northern Chile located 1500–1800 km from the epicenter. Here we present evidence that surface displacement events recorded by the IPOC (Integrated Plate Boundary Observatory in N-Chile) Creepmeter Array are related to earthquakes on the underlying subduction zone interface or to large earthquakes around the world. Our observations document dynamic triggering of shallow slip on faults in a forearc setting. Continuous monitoring revealed that up to 30 displacement events per year occur on the monitored fault segments,> 90% of them triggered by earthquakes in the near or far field synchronous to the passage of the seismic wave. We can clearly attribute far field triggering to the passage of the surface wave and near field triggering to the passage of the body wave. The most distant triggered displacement event monitored occurred after the 2011, M w= 9.0 Tohoku-Oki Earthquake located 16 468 km away following the passage of large amplitude SS waves. Comparing the triggered displacement events with other triggered phenomena like seismicity, volcanic eruptions, hydrological changes as well as with data from the California Creepmeter Array we find that the seismic energy density appropriately describes a magnitude–distance scaling relationship of slip triggering. Finally, the observed surface displacement is found to not occur by continuous creep, but rather through nearly exclusively discrete displacement events.
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