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Non-Double-Couple Moment Tensors of Earthquakes Calculated Using Empirical Green's Functions

机译:使用经验绿色功能计算的非双重矩张地震

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摘要

We present a joint inversion for empirical Green's functions (EGFs) and high-resolution non-double-couple (non-DC) moment tensors. First, the EGFs are constructed using known moment tensors of earthquakes occurring in a small focal zone. Second, the estimated EGFs are applied to refine the original moment tensors used for constructing the EGFs. Because the EGFs describe the velocity model better than the standard GFs, the refined moment tensors are more accurate. The method is applied to real observations of earthquakes of the 2008 swarm in West Bohemia, Czech Republic, where tiny details in fracturing in the focal zone are revealed. Refined moment tensors indicate fault closing caused by compaction of fault gouge during fracturing process related to fault weakening by fluids in the focal zone. The application of the proposed inversion can improve moment tensors reported in existing local, regional, or global catalogs for areas with a concentrated seismicity.
机译:我们提出了经验绿色功能(EGFS)和高分辨率非双夫妇(非DC)时刻张量的联合反演。 首先,使用在小焦点区域中发生的已知的地震张于地震的已知力矩张量来构建EGF。 其次,应用估计的EGFS以优化用于构建EGF的原始力矩张量。 因为EGFS描述了比标准GFS更好的速度模型,所以精致的力矩张量更准确。 该方法适用于捷克共和国西波希米亚2008年群地震的实际观察,其中揭示了焦区压裂中的微小细节。 精致的力矩张量表明在压裂过程中,在焦点区域中的流体弱化的压裂过程中的断裂过程中的压差引起了故障关闭。 拟议的反演的应用可以改善现有的地方,区域或全球目录中报告的瞬间张量,以浓缩地震性的地区。

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