Fig. 1From: Migration of earthquakes with a small stress drop in the Tanzawa Mountains, JapanTectonic setting of the Tanzawa Mountains. The Philippine Sea plate is subducting in the north-west direction beneath the Amur plate in this region at a rate of 30 to 50Â mm per year, as indicated by the black arrow (Seno et al. 1993; Wei and Seno 1998). Black broken lines indicate the surface depth of the Philippine Sea plate (Hirose et al. 2008a, 2008b; Nakajima et al. 2009). Black lines on land show surface traces of active faults (Research Group for Active Faults of Japan 1991). Squares show seismic stations used for the hypocenter relocation, and triangles indicate active volcanoesBack to article page