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首页> 外文会议>International Symposium on Earth Hazard and Disaster Mitigation >Focal Mechanism of the August 18~(th) 2012 Mw6.3 Palu-Koro Earthquake and Its Implication of Seismic Hazard
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Focal Mechanism of the August 18~(th) 2012 Mw6.3 Palu-Koro Earthquake and Its Implication of Seismic Hazard

机译：2012年8月18日〜（TH）的焦点机制2012 MW6.3 PALU-KALO地震及其对地震危害的含义

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The Palu-Koro fault is a left-lateral strike-slip fault in Sulawesi within the active triple junction generated by the ongoing fast convergence of the Pacific-Philippine plate, the Indo-Australian plate and the Sunda plate. There are densely populated areas that are susceptible to earthquakes occur along the fault, and the August 18~(th) 2012, M_w6.3 earthquake is one of such events. To better understand this earthquake and the seismic hazard in the region, we estimated source parameters of this earthquake using the Cut and Paste (CAP) inversion method with regional broadband waveform data. Our results show that the best solution of this event is 339°, 71°, -16° and 11 km for strike, dip, rake and centroid depth, respectively. Inversions using stations within different distance ranges, i.e. 0-5°,0-10° and 0-20°, reveal consistent solutions, suggesting the robustness of our result, which is also in agreement with that from the other agencies, i.e. USGS and Global CMT. We further verify the centroid depth by modeling the depth phases recorded at the teleseismic distance, which also confirm the depth of 11km. Finally we analyzed the Coulomb stress caused by this earthquake and historical events to investigate the interaction between the earthquakes in the region. Our analysis also shows that the unclamping effect from the 1996 Mw7.9 megathrust in the Minahassa Trench promoted the occurrence of the 2012 Mw6.3 event. High slip-rate across the fault and Coulomb stress analysis suggest that more attention should be paid to the segments along the Palu-Koro fault that did not rupture in the previous earthquake circle.
机译：Palu-Koro故障是Sulawesi的左侧滑动故障，由太平洋 - 菲律宾板，印度澳大利亚板块和Sunda板材的持续快速收敛产生的活动三界。易受地震的人口稠密的区域沿着故障发生，8月18日〜（Th）2012，M_W6.3地震是此类事件之一。为了更好地了解该地区的地震和地震危险，我们使用具有区域宽带波形数据的剪切和粘贴（帽）反转方法估计该地震的源参数。我们的研究结果表明，该活动的最佳解决方案分别为339°，71°，-16°和11km，分别为罢工，倾角，耙和质心深度。使用不同距离范围内的站的逆转，即0-5°，0-10°和0-20°，揭示了一致的解决方案，表明我们的结果的稳健性，这也与其他机构的稳健性，即USGS和USGS和全球CMT。我们通过在距离距离记录的深度相位进行建模，进一步验证质心深度，这也证实了11km的深度。最后，我们分析了这种地震和历史事件引起的库仑应力，以研究该地区地震之间的相互作用。我们的分析还表明，1996年MW7.9 Megathrust在Minahassa Trench中的解除效果促进了2012 MW6.3事件的发生。跨越故障和库仑应力分析的高防滑速率表明，应更多地关注沿着Palu-Koro故障的细分，以前在以前的地震圈中没有破裂。

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