1918 San Fermín earthquake

The 1918 San Fermín earthquake, also known as the Puerto Rico earthquake of 1918, struck the island of Puerto Rico at 10:14:42 local time on October 11. The earthquake measured 7.1 on the moment magnitude scale and IX (Violent) on the Mercalli intensity scale. The mainshock epicenter occurred off the northwestern coast of the island, somewhere along the Puerto Rico Trench.

1918 San Fermín earthquake
Mayagüez
San Juan
UTC time1918-10-11 14:14:42
ISC event913306
USGS-ANSSComCat
Local dateOctober 11, 1918 (1918-10-11)
Local time10:14:42
Magnitude7.1 Mw
Depth15 km (9.3 mi)
Epicenter18.8°N 67.22°W / 18.8; -67.22
TypeUnknown
Areas affectedPuerto Rico
Total damage$4–29 million USD
Max. intensityMMI IX (Violent)
TsunamiYes
Casualties76–118

The earthquake triggered a tsunami that swept the west coast of the island. The combined effects of the earthquake and tsunami made it one of the worst natural disasters that have struck the island. The losses resulting from the disaster were approximately 76–118 casualties and $4–29 million in property damage.

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