M 4.9 earthquake: North Pacific Ocean (Japan) — April 21, 1980

M 4.9 earthquake: North Pacific Ocean (Japan) — April 21, 1980. Epicenter 697 km S of Hamamatsu, depth 527 km, 05:01 Local (1980-04-20 20:01 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (697 km S, Japan) — 28.474, 138.379

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