Fig. 1

Map of the Kanto region, Japan. The filled black triangles are F-net stations. Plotted focal mechanisms are moment tensor (MT) solutions listed in the F-net MT catalog. The left panel is an enlarged map of the area and enclosed by the blue dashed line. Inverse triangles in the left panel are MeSO-net stations. The background contours in the right panel is the bedrock depths of the JIVSM (Koketsu et al. 2012)