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首页> 外文期刊>Earth, planets and space: EPS >Spatial distribution of crack structure in the focal area of a volcanic earthquake swarm at the Hakone volcano, Japan
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Spatial distribution of crack structure in the focal area of a volcanic earthquake swarm at the Hakone volcano, Japan

机译：日本箱根火山群震源区裂缝结构的空间分布

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摘要

We have performed shear wave splitting analyses for seismograms recorded at stations located just above, and outside, the focal area of the earthquake swarm at the Hakone volcano, Japan, in August 2009. Average values of the direction of faster split shear wave polarization (Φ) at two stations above the focal area correspond to each focal alignment of the earthquake swarm. In contrast, average values of Φ at three stations outside the focal area correspond to the direction of the maximum horizontal compressional stress. We found that the average values of the time lag between the two split shear waves inside the focal area are relatively high compared with those outside the focal area. These facts suggest that cracks with a high density aligned parallel to the faults of the earthquake swarm in the focal area. Crustal fluid was selectively injected into this pre-existing cracked media accompanied by effective normal stress reduction in the cracks, resulting in the earthquake swarm.
机译：2009年8月，我们对位于日本箱根火山震群焦点区域上方和外部的地震记录进行了剪切波分裂分析。更快的剪切波极化方向（Φ）的平均值）在震源区上方的两个站点对应于地震群的每个震源线。相反，在焦点区域之外的三个位置的Φ平均值对应于最大水平压缩应力的方向。我们发现，焦点区域内两个分裂剪切波之间的时滞平均值与焦点区域外的平均值相比相对较高。这些事实表明，高密度裂缝平行于震源区的地震断层。将地壳流体选择性地注入到这种预先存在的裂缝介质中，同时有效降低裂缝中的法向应力，从而导致了地震群。

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