M 4.9 earthquake: Philippine Sea (Surigao, Philippines) — October 28, 1981

M 4.9 earthquake: Philippine Sea (Surigao, Philippines) — October 28, 1981. Epicenter 97 km NE of Surigao, depth 52 km, 06:42 Local (1981-10-27 22:42 UTC). Shaking felt by ~573K people. Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (97 km NE of Surigao, Philippines) — 10.37, 126.143

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