Abstract
Lying within the seafloor off the southern coast of southwestern Japan, the Nankai Trough is the surface expression of the subduction of the Philippine tectonic plate beneath the Eurasian plate. In the past, this fault has been responsible for producing large, tsunami‐generating earthquakes—the most recent one, a magnitude 8.2 event in 1944. Similar events are expected in the future. One geologic feature that may predispose the region to such earthquakes is the presence of a low velocity zone previously identified that stretches shoreward from the Nankai Trough. The low velocity zone, a subsurface region through which primary seismic waves propagate with reduced velocity, may be related to increased seafloor uplift during an earthquake, a property that would tend to generate tsunamis.
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