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The occurrence pattern of historical great earthquakes along the Nankai Trough indicates the existence of rupture segments that seem to correlate with 100-km-scale lateral variation in the dip angle of the subducting Philippine Sea plate. For instance, the latest earthquakes, the 1944 Tonankai, and the 1946 Nankai earthquakes initiated their ruptures off Kii Peninsula, where the dip angle of the slab...
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