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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Fault plane orientations of microearthquakes at Mt. Etna from the inversion of P-wave rise times
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Fault plane orientations of microearthquakes at Mt. Etna from the inversion of P-wave rise times

机译：台山微地震的断层平面取向。埃特纳火山从P波上升时间反演

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摘要

A crucial point in the analysis of tectonic earthquakes occurring in a volcanic area is the inference of the orientation of the structures along which the ruptures occur. These structures represent zones of weakness which could favor the migration of melt toward the surface and the assessment of their geometry is a fundamental step toward efficient evaluation of volcanic risk. We analyzed a high-quality dataset of 171 low-magnitude, tectonic earthquakes that occurred at Mt. Etna during the 2002-2003 eruption. We applied a recently developed technique aimed at inferring the source parameters (source size, dip and strike fault) and the intrinsic quality factor Q_p of P waves from the inversion of rise times. The technique is based on numerically calibrated relationships among the rise time of first P waves and the source parameters for a circular crack rupturing at a constant velocity. For the most of the events the directivity source effect did not allow us to constrain the fault plane orientation. For a subset of 45 events with well constrained focal mechanisms we were able to constrain the "true" fault plane orientation. The level of resolution of the fault planes was assessed through a non linear analysis based on the random deviates technique. The significance of the retrieved fault plane solutions and the fit of the assumed source model to data were assessed through a χ-square test. Most of the retrieved fault plane solutions agree with the geometrical trend of known surface faults. The inferred source parameters and Q_p are in agreement with the results of previous studies.
机译：分析火山区发生的构造地震的关键点是推断破裂发生的结构的方向。这些结构代表了薄弱区域，可能有利于熔体向表面的迁移，其几何形状的评估是有效评估火山风险的基本步骤。我们分析了171处山下发生的低级构造地震的高质量数据集。埃特纳火山在2002-2003年爆发。我们应用了一种最新开发的技术，旨在根据上升时间的反演来推断P波的震源参数（震源尺寸，倾角和走向断裂）和固有品质因数Q_p。该技术基于第一P波的上升时间与恒定速度下圆形裂纹破裂的源参数之间的数值校准关系。对于大多数事件，方向性源效应不允许我们约束断层平面方向。对于45个事件的子集，它们具有良好约束的震源机制，我们能够约束“真实的”断层平面方向。通过基于随机偏差技术的非线性分析来评估断层的分辨率水平。通过χ2检验评估了取回的断层平面解的重要性以及假设的源模型对数据的拟合度。检索到的大多数断层平面解与已知表面断层的几何趋势一致。推断的源参数和Q_p与以前的研究结果一致。

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