M 4.5 earthquake: Philippine Sea (Agana, Guam) — September 21, 1980

M 4.5 earthquake: Philippine Sea (Agana, Guam) — September 21, 1980. Epicenter 646 km SW of Agana, depth 33 km, 10:50 Local (1980-09-21 01:50 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (646 km SW of Agana, Guam) — 11.123, 139.307

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