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Estimating Rupture Directions from Local Earthquake Data Using the IPOC Observatory in Northern Chile

机译:使用智利北部的IPOC天文台估算来自当地地震数据的破裂方向

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Local seismic broadband recordings of the Integrated Plate boundary Observatory Chile (IPOC) are used to determine rupture directions for 60 M ≥ 5.0 events in the foreshock and aftershock series of the 2014 M_w 8.1 Iquique earthquake in northern Chile. The applied method is based on accurate measurements of the P-wave coda polarization, which exhibits systematic, azimuth-dependent variations with time as the earthquake rupture propagates. We demonstrate a general consistency with observations from teleseismic backprojection studies for the main event and its largest foreshock (M_w 6.7) and aftershock (M_w 7.6). A large portion of the here analyzed events show unilateral rupture behavior, with a predominance of down-dip (east) oriented directivity.This study documents the potential of retrieving rupture directions for M ~ 5 earthquakes from a high-quality local seismic monitoring system.
机译:集成板边界天文台智利(IPOC)的本地地震宽带记录用于确定2014 M_W 8.1 IQUIQUE地震的预科和余震系列中的60米≥5.0事件的破裂方向。 所应用的方法基于P波段极化的精确测量,其在地震破裂传播时表现出系统的方位,方位相依赖的变化。 我们展示了与主要事件的Telesmic BackProject研究的观察结果一般一致性及其最大的预测(M_W 6.7)和余震(M_W 7.6)。 这里的大部分分析事件显示单侧破裂行为,占地面积的偏向(东)为导向性。本研究文件从高质量的地方地震监测系统中检索M〜5地震破裂方向的潜力。

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