High resolution seismic velocity structure around the Yamasaki fault zone of southwest Japan as revealed from travel-time tomography

作者：Nugraha Andri Dian^*; Ohmi Shiro; Mori Jim; Shibutani Takuo

来源：Earth Planets and Space, 2013, 65(8): 871-881.

DOI：10.5047/eps.2012.12.004

• Yamasaki fault
• travel-time tomography
• velocity structure

The Yamasaki fault zone in southwestern Japan currently has a high potential for producing a large damaging earthquake. We carried out a seismic tomographic study to determine detailed crustal structures for the region. The velocity model clearly images a low-velocity and high V-p/V-s (high Poisson's ratio) anomaly in the lower crust beneath the Yamasaki fault zone at a depth of similar to 15-20 km. This anomaly may be associated with the existence of partially-melted minerals. The existence of this anomaly below the fault zone may contribute to changing the long-term stress concentration in the seismogenic zone.

• 出版日期2013
• 单位防灾科技学院