M 4.9 earthquake: North Pacific Ocean (Japan) — December 20, 1980

M 4.9 earthquake: North Pacific Ocean (Japan) — December 20, 1980. Epicenter 816 km S of Hamamatsu, depth 499 km, 12:50 Local (1980-12-20 03:50 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (816 km S, Japan) — 27.576, 139.703

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