M 4.6 earthquake: North Pacific Ocean (Japan) — May 20, 1990

M 4.6 earthquake: North Pacific Ocean (Japan) — May 20, 1990. Epicenter 863 km S of Hamamatsu, depth 340 km, 00:48 Local (1990-05-19 15:48 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (863 km S, Japan) — 27.273, 140.301

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