M 4.5 earthquake: Philippine Sea (Agana, Guam) — January 20, 1981

M 4.5 earthquake: Philippine Sea (Agana, Guam) — January 20, 1981. Epicenter 223 km SW of Agana, depth 33 km, 21:18 Local (1981-01-20 11:18 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (223 km SW of Agana, Guam) — 11.756, 143.682

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