M 4.6 earthquake: North Pacific Ocean (Japan) — July 21, 1979

M 4.6 earthquake: North Pacific Ocean (Japan) — July 21, 1979. Epicenter 720 km S of Yokohama, depth 33 km, 14:42 Local (1979-07-21 05:42 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (720 km S, Japan) — 29.31, 142.096

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