Temporal variation in crustal structure derived from hybrid analysis of the seismic attenuation and anisotropy

在2009年箱根火山震群区域发现了一个裂隙密度较高的裂隙结构，其方向与震中走向平行，震群期间上述裂隙结构中含有地壳流体。认为在无震群期间，另一种裂隙构造占主导地位。研究表明，随着震群的发生，地壳结构可能发生变化。

We detected a crack structure with high crack density, whose direction is parallel to the epicenter alignment, in the region of the 2009 earthquake swarm at the Hakone volcano.Crustal fluid was included in the above crack structure during the earthquake swarm period. It was suggested that another crack structure was dominant during the period without earthquake swarm. This study presents that crustal structure possibly varies accompanied with occurrences of earthquake swarm.