M 4.6 earthquake: North Pacific Ocean (Japan) — March 31, 1977

M 4.6 earthquake: North Pacific Ocean (Japan) — March 31, 1977. Epicenter 823 km SE of Shizuoka, depth 16 km, 18:40 Local (1977-03-31 09:40 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (823 km SE, Japan) — 28.228, 141.939

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