M 4.9 earthquake: North Pacific Ocean (Japan) — September 23, 1984

M 4.9 earthquake: North Pacific Ocean (Japan) — September 23, 1984. Epicenter 272 km SE of Yokohama, depth 33 km, 18:51 Local (1984-09-23 09:51 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (272 km SE, Japan) — 33.482, 141.402

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