M 4.6 earthquake: Philippine Sea (Agana, Guam) — December 18, 1987

M 4.6 earthquake: Philippine Sea (Agana, Guam) — December 18, 1987. Epicenter 258 km SW of Agana, depth 33 km, 10:50 Local (1987-12-18 00:50 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (258 km SW of Agana, Guam) — 11.914, 142.983

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