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首页> 外文期刊>Seismological research letters >Focal Mechanism, Magnitude, and Finite-Fault Rapid Estimation Using the Elliptical Patch Method in Chile
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Focal Mechanism, Magnitude, and Finite-Fault Rapid Estimation Using the Elliptical Patch Method in Chile

机译:智利椭圆形贴片方法的焦点机制,幅度和有限故障快速估计

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Nowadays, most fast, automatic algorithms estimate the magnitude and location of earthquakes assuming a point-source approximation that might produce large errors in the predicted shaking. In this study, using a kinematic approach, we modeled the fault plane as an elliptical patch with a Gaussian slip distribution to perform a rapid estimation of the finite fault, focal mechanism, and moment magnitude. We implemented this finite-fault kinematic inversion using data from the Centro Sismológico Nacional of the Universidad de Chile. We used near-field data, up to 600 km from the epicenter, mostly from accelerograms and a few nonsaturated broadband records. By considering data up to 5 min from the origin time, we are able to retrieve relevant source parameters within 10-15 min from the occurrence of the event. This elliptical patch method (EPM) successfully resolves the source parameters for 45 mod-erate-to-large events, from 2013 to 2017 (magnitudes ranging from 6.0 to 8.3). These results encourage the use of the EPM in the rapid response to moderate-to-large earthquakes in subduc-tion zones.
机译:如今,最快速,自动算法估计地震的幅度和位置,假设可能在预测摇动中产生大错误的点源近似。在本研究中,使用运动方法,我们将故障平面设计为具有高斯滑动分布的椭圆形贴片,以便对有限故障,焦点机制和矩幅度进行快速估计。我们利用来自智利大学的CentroSismológicoNacional的数据实施了这种有限故障的运动反演。我们使用近场数据,距离震中最多600公里,主要来自Accelerograms和一些非饱和宽带记录。通过从原始时间考虑最多5分钟的数据,我们能够在事件发生时在10-15分钟内检索相关的源参数。这种椭圆形补丁方法(EPM)成功地解析了2013年至2017(从6.0到8.3范围的大小)的45个Mod-er-erate-to-大的事件的源参数。这些结果促进了EPM在缓慢反应中对子霉菌区中的中等地震的快速反应。

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