M 4.9 earthquake: North Pacific Ocean (Japan) — April 13, 1978

M 4.9 earthquake: North Pacific Ocean (Japan) — April 13, 1978. Epicenter 558 km S of Yokohama, depth 16 km, 05:03 Local (1978-04-12 20:03 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (558 km S, Japan) — 30.731, 141.71

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