M 5.4 earthquake: Philippine Sea (Cotabato, Philippines) — December 23, 1977

M 5.4 earthquake: Philippine Sea (Cotabato, Philippines) — December 23, 1977. Epicenter 83 km SW of Cotabato, depth 53 km, 18:56 Local (1977-12-23 10:56 UTC). Shaking felt by ~13.9M people. Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (83 km SW of Cotabato, Philippines) — 6.581, 123.855

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