M 4.6 earthquake: North Pacific Ocean (Japan) — February 23, 1977

M 4.6 earthquake: North Pacific Ocean (Japan) — February 23, 1977. Epicenter 305 km SE of Yokohama, depth 38 km, 10:35 Local (1977-02-23 01:35 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (305 km SE, Japan) — 32.993, 141.132

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