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

在2009年箱根火山震群地区，我们发现了一个方向与震中走向平行的高密度裂缝结构，在震群期间，地壳流体被包含在上述裂缝结构中。认为在无震群期，另一种裂隙构造占主导地位。研究表明，地壳结构可能随震群的发生而发生变化。

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.