M 4.6 earthquake: North Pacific Ocean (Japan) — September 13, 1988

M 4.6 earthquake: North Pacific Ocean (Japan) — September 13, 1988. Epicenter 558 km SE of Hamamatsu, depth 33 km, 22:18 Local (1988-09-13 13:18 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (558 km SE, Japan) — 30.327, 140.622

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