M 4.6 earthquake: Philippine Sea (Hamamatsu, Japan) — December 21, 1977

M 4.6 earthquake: Philippine Sea (Hamamatsu, Japan) — December 21, 1977. Epicenter 1113 km SE of Hamamatsu, depth 33 km, 11:50 Local (1977-12-21 01:50 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (1113 km SE of Hamamatsu, Japan) — 25.735, 142.855

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