Fig. 1.

(a) Map of the Hakone volcano, central Japan. Triangles, crosses, and squares indicate the HSRI, ERI and NIED Hi-net stations, respectively. Solid rectangle (SGN) shows the broadband seismic station (NIED F-net). Gray lines indicate surface traces of active faults (Research Group for Active Faults of Japan, 1991). H. F and T. F indicate the surface trace of the Hirayama and Tanna Faults. The rectangle corresponds to the region shown in Fig. 1(b). In the inset map, the study area is shown with respect to the Japanese Islands. A star indicates the epicenter of the 2011 off the Pacific coast of Tohoku Earthquake determined by USGS. (b) Magnification of the rectangular area shown in Fig. 1(a). Gray lines indicate contour lines at 100 m intervals. Waveforms observed at Komagatake station (KOM) are indicated in Figs. 3 and 4.