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

我们在箱根火山2009年地震群区发现了一个与震中走向平行的高裂缝密度裂缝结构。地震群期地壳流体包含在上述裂缝结构中。在无震群期，另一裂缝结构占主导地位。研究表明，地壳结构可能随地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.