M 4.6 earthquake: North Pacific Ocean (Japan) — December 20, 1991

M 4.6 earthquake: North Pacific Ocean (Japan) — December 20, 1991. Epicenter 478 km S of Hamamatsu, depth 442 km, 00:12 Local (1991-12-19 15:12 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (478 km S, Japan) — 30.453, 138.404

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