M 4.6 earthquake: North Pacific Ocean (Japan) — August 30, 1977

M 4.6 earthquake: North Pacific Ocean (Japan) — August 30, 1977. Epicenter 573 km S of Hamamatsu, depth 428 km, 11:02 Local (1977-08-30 02:02 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (573 km S, Japan) — 29.762, 139.389

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