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1918 PUERTO RICO EARTHQUAKE

Earthquake in Puerto Rico 1918 Tsunami in Puerto Rico 1918 Earthquakes in Puerto Rico History Earthquake in Puerto Rico 2010 Puerto Rico Earthquake Maps Current Earthquake Puerto Rico Puerto Rico Earthquake Today Terremoto 1918 Puerto Rico




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1918 San Fermín earthquake


San Fermín earthquake of 1918
Date October 11, 1918 (1918-10-11)
Magnitude 7.5 Mw
Epicenter 18°27′N 66°06′W / 18.45°N 66.1°W / 18.45; -66.1Coordinates: 18°27′N 66°06′W / 18.45°N 66.1°W / 18.45; -66.1
Countries or regions  Puerto Rico
Tsunami 20-35ft
Aftershocks 14
Casualties 116
Brick house destroyed by the earthquake, Mayagüez, Puerto Rico
Cathedral of Mayagüez after the first earthquake; later damage took down one tower
"La Habanera de Infanzón y Rodríguez" building in Mayagüez

The San Fermín earthquake,[1][2][3] also known as the Puerto Rico earthquake of 1918, was a major earthquake that struck the island of Puerto Rico at 10:14am on October 11, 1918. The magnitude for the earthquake was a 7.5 (or Level IX in the Rossi-Forel scale); however, that might not be an exact number. The main-shock epicenter occurred offshore about 5 km (3.1 mi) from the northwestern coast of the island, somewhere along the Puerto Rico Trench.

The earthquake triggered a tsunami with waves measured at approximately 20–35 ft; it swept the west coast of the island. The combined effects of the earthquake and tsunami made it remembered as one of the worst natural disasters that have struck the island. The losses resulting from the disaster were approximately 116 casualties and $4 million in property.


1918 Puerto Rico earthquake Geology of the earthquake


The epicenter of the 1918 Puerto Rico Earthquake was located in the Mona Passage about 16 km (9.9 mi) from the northwestern coast of the island, somewhere along an old left-lateral strike-slip fault close to the Mona Passage. The strongest ground shaking has been estimated at around a magnitude 7.5, or Level IX (Rossi-Forel scale). The resulting tsunami affected primarily the west coast towns of the Island (primarily Mayaguez).


1918 Puerto Rico earthquake Immediate effects


As a result of the earthquake, numerous structures in the west coast suffered irreparable damage. Factories and production facilities were virtually destroyed, while bridges and roads were severely damaged. The earthquake caused several mudslides in areas where the magnitude exceeded Level VII, but none caused numerous deaths. Also, the river currents were affected, which, in many cases affected the foundations of many bridges, resulting in their collapse. Telegraph cables under the ocean were damaged, cutting off the island from outside communication for a time.[4]

The reported casualties of the earthquake have been estimated somewhere between 91 to 116 deaths. Approximately 40 of these deaths were caused by the tsunami which swept shore communities. Also, damages to property were estimated at around $4 million, which was a huge amount at that time in terms of the island's economy.

In Mayaguez, the largest city affected, 700 masonry buildings were damaged and 1,000 wooden houses, so many people were homeless. Major buildings like the church, post office and hall were severely damaged. With fear because of the aftershocks, many people camped out in the hills for weeks.[4]


1918 Puerto Rico earthquake Tsunami


Simulation of the results of the tsunami on the coast of Aguadilla, Puerto Rico.

As a result of the earthquake, a tsunami lashed the west coast of the island, probably 4–7 minutes after the main shock. The highest waves were measured at 20 ft and destroyed several coastal villages. It has been estimated that 40 people were drowned as a direct result of the tsunami.

The tsunami reached Galveston, Texas, where it registered as a disturbance on tide gauges.


1918 Puerto Rico earthquake Aftershocks


Several aftershocks were reported immediately after the main earthquake. On October 24 and November 12, two strong aftershocks were reported in the island. However, no damage was reported as a result.


1918 Puerto Rico earthquake See also



1918 Puerto Rico earthquake External links



1918 Puerto Rico earthquake References


  1. ^ "Sobre la edificación del Templo" (in Spanish). Retrieved August 8, 2010. 
  2. ^ Subcomite de la Historia de Mayagüez (1960), Historia de Mayagüez 1760-1960 (in spanish), Talleres Graficos Interamericanos, retrieved September 7, 2010 
  3. ^ Millie Gil. A 92 años del Terremoto de San Fermín, 1918. Mayaguez Sabe a Mango. 17 October 2010.
  4. ^ a b Peter Aviles, "The Earthquake of the Century", 2002, hosted at University of Puerto Rico, accessed 24 October 2013


Earthquake in Puerto Rico 1918 Tsunami in Puerto Rico 1918 Earthquakes in Puerto Rico History Earthquake in Puerto Rico 2010 Puerto Rico Earthquake Maps Current Earthquake Puerto Rico Puerto Rico Earthquake Today Terremoto 1918 Puerto Rico

| Earthquake in Puerto Rico 1918 | Tsunami in Puerto Rico 1918 | Earthquakes in Puerto Rico History | Earthquake in Puerto Rico 2010 | Puerto Rico Earthquake Maps | Current Earthquake Puerto Rico | Puerto Rico Earthquake Today | Terremoto 1918 Puerto Rico | 1918_Puerto_Rico_earthquake | History_of_Puerto_Rico | Puerto_Rico_Trench | Ponce_Historic_Zone | Puerto_Rico | Ponce_Cathedral | Arecibo,_Puerto_Rico | Aguadilla,_Puerto_Rico | Mona_Passage | Aguada,_Puerto_Rico | Public_housing | Culebrinas_River | Geology_of_Puerto_Rico | Calle_25_de_Enero | List_of_20th-century_earthquakes | List_of_Roman_Catholic_seminaries

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