Image of the three-dimensional P-wave velocity structure of the Nankai trough region, SW Japan (investigators: Adrien F. Arnulf, Dan Bassett, Alistair Harding)

This image of the three-dimensional (3-D) P-wave velocity structure of the Nankai trough region, in Southwest Japan, is derived from joint travel-time tomographic inversion of active source seismic data and regional earthquake seismicity (JMA catalogue). The image is in PNG format. The local grid is 800 km long, 500 km wide and is centered on 33.535°N and 134.675°E and rotated -20°N. The associated Matlab script can be used to plot the data set. The data file was generated as part of a project called 3-D Onshore-Offshore Seismic Investigation of Japan's Megathrusts. Funding was provided by NSF grants OCE 1657480 (UTIG) and OCE 1658010 (SIO).