M 5.1 earthquake: North Pacific Ocean (Japan) — May 21, 1977

M 5.1 earthquake: North Pacific Ocean (Japan) — May 21, 1977. Epicenter 822 km S of Hamamatsu, depth 340 km, 22:40 Local (1977-05-21 13:40 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (822 km S, Japan) — 27.583, 139.997

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