M 4.9 earthquake: Philippine Sea (Agana, Guam) — April 21, 1983

M 4.9 earthquake: Philippine Sea (Agana, Guam) — April 21, 1983. Epicenter 174 km SW of Agana, depth 33 km, 02:34 Local (1983-04-20 16:34 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (174 km SW of Agana, Guam) — 12.425, 143.558

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