M 4.6 earthquake: North Pacific Ocean (Japan) — August 12, 1975

M 4.6 earthquake: North Pacific Ocean (Japan) — August 12, 1975. Epicenter 307 km S of Hamamatsu, depth 385 km, 17:51 Local (1975-08-12 08:51 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (307 km S, Japan) — 31.971, 138.097

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