M 4.9 earthquake: Philippine Sea (Zamboanga, Philippines) — December 18, 1990

M 4.9 earthquake: Philippine Sea (Zamboanga, Philippines) — December 18, 1990. Epicenter 163 km N of Zamboanga, depth 33 km, 18:37 Local (1990-12-18 10:37 UTC). Shaking felt by ~2.7M people. Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (163 km N of Zamboanga, Philippines) — 8.353, 122.405

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