M 4.6 earthquake: North Pacific Ocean (Japan) — April 16, 1978

M 4.6 earthquake: North Pacific Ocean (Japan) — April 16, 1978. Epicenter 619 km S of Hamamatsu, depth 430 km, 05:08 Local (1978-04-15 20:08 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (619 km S, Japan) — 29.311, 139.297

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