M 4.6 earthquake: Philippine Sea (Surigao, Philippines) — September 23, 1981

M 4.6 earthquake: Philippine Sea (Surigao, Philippines) — September 23, 1981. Epicenter 105 km E of Surigao, depth 33 km, 00:49 Local (1981-09-22 16:49 UTC). Shaking felt by ~340K people. Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (105 km E of Surigao, Philippines) — 9.954, 126.433

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