M 7.1 earthquake: Caribbean Sea (Mayagüez, Puerto Rico) — October 11, 1918

M 7.1 earthquake: Caribbean Sea (Mayagüez, Puerto Rico) — October 11, 1918. Epicenter 56 km N of Mayagüez, depth 15 km, 10:14 Local (1918-10-11 14:14 UTC). Shaking felt by ~23M people. Readings from every reporting agency, affected towns, aftershock sequence.

Caribbean Sea (56 km N of Mayagüez, Puerto Rico) — 18.7, -67.189

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