The geophysical and geological data in and near the Japan Arc are summarized as a contribution to the Upper Mantle Project. These up-to-date data presented here provide information about the structure and the physical processes underneath the islands of Japan, which are one of the typical island arcs. The following items are covered: topography and geology, volcanoes, gravity anomaly, earthquake seismology, explosion seismology, crustal thickness, crustal deformation, terrestrial heat flow, geomagnetic anomaly, and geomagnetic variation anomaly.

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