M 5.3 earthquake: Philippine Sea (General Santos, Philippines) — May 21, 1978

M 5.3 earthquake: Philippine Sea (General Santos, Philippines) — May 21, 1978. Epicenter 172 km W of General Santos, depth 572 km, 15:24 Local (1978-05-21 07:24 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (172 km W of General Santos, Philippines) — 6.176, 123.616

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