Fig. 10

Trace of USDP-4 drilling with the merged sections of Figs. 7 and 8. The upper left figure shows the trace map view of the USDP-4 borehole, the profile, and the CMP line of the reflection survey. The red and yellow triangles show the lava dome formed in the latest and older eruptions, respectively. The green circle shows the location of the pressure sources estimated by Kohno et al. (2008). The size of the green circles is arbitrary. The lower figure indicates the trace and the shallow section. The interpreted reflector and fault are also plotted. The blue line denotes the trace of USDP-4. The orange part of the trace indicates the conduit zone defined by Nakada et al. (2005). The upper right figure shows the interpretation and the E-W cross-section of the model. The solid rectangle denotes the resolved area in this study. The yellow area is the conduit zone inferred from our results and previous studies. The dashed arrows indicate the path of magma supply from source B to A.