1929 Cumaná earthquake

Coordinates: 10°32′35″N 64°26′38″W / 10.543°N 64.444°W / 10.543; -64.444
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1929 Cumaná earthquake
1929 Cumaná earthquake is located in Venezuela
1929 Cumaná earthquake
UTC time1929-01-17 11:45:42
ISC event907860
USGS-ANSSComCat
Local dateJanuary 17, 1929
Local time7:45 VET
Duration30 seconds
Magnitude6.7 Mw
Depth10.0 km
Epicenter10°32′35″N 64°26′38″W / 10.543°N 64.444°W / 10.543; -64.444
TypeStrike-slip
Areas affectedVenezuela
Max. intensityMMI IX (Violent)
Tsunami3 m (9.8 ft)
Casualties200–1,600 dead, 800 injured

The 1929 Cumaná earthquake occurred on January 17 at 07:45:44 local time, affecting Venezuela. Measuring 6.7 on the moment magnitude scale (Mw ) at a depth of 10 km (6.2 mi),[1] the earthquake severely damaged the city of Cumaná in Sucre state. The earthquake had an epicenter located offshore in the Caribbean Sea, and had a maximum Modified Mercalli intensity scale rating of IX (Violent).[2] It lasted 30 seconds,[3][4] causing major damage and a tsunami. More than 200 people were killed although the finalized death toll is unknown; possibly 1,600.

Earthquake

The earthquake was associated with

strike-slip faulting at a shallow depth; a common characteristic for earthquakes of this depth in the region of northern Venezuela.[5] It is one of the most extensively studied earthquakes in Venezuela prior to 1997.[2] The El Pilar Fault System, a right-lateral strike-slip fault extending 350 kilometres (220 mi) from the Cariaco Basin to the Paria Peninsula is thought to be the source of the event. The earthquake in 1929 is thought to have ruptured approximately 30–40 kilometres (19–25 mi) of the fault.[6][7] Most of the surface rupture was offshore, and only 4 kilometres (2.5 mi) of it was visible at the surface, extending east–west.[2] The surface-wave magnitude (Ms ) was calculated to be 6.3; a revision of 6.9 which was considered an overestimation. The same fault segment is thought to have partially ruptured during the 1997 Cariaco earthquake, which occurred east of the 1929 event. It is believed that the 1929 earthquake ruptured a segment that was involved in a 1797 event.[2]

Tsunami

At the coast of Cumaná, in Puerto De Sucre, survivors witnessed the a drawback of the sea by as much as 200 meters. The tsunami reportedly swept away some homes located along the shore, killing some 40 individuals. The maximum tsunami height was measured at 3 m (9.8 ft).[8] Cumaná suffered severe damage from the tsunami, and the waves were recorded in four other cities. Two launches, each weighing 5-tons were carried and dumped inland. Boats were destroyed.[9] The maximum tsunami run-up was 6 m (20 ft).[10]

Impact

The earthquake razed to the ground more than 3,500 homes in

Margarita, Güiria, Carúpano, Río Caribe, Caracas, and Irapa.[11] No official figure for the death toll exists, although it has been estimated to be as much as eight percent of the population of 20,000.[12]
At least 800 people were injured.

See also

References

  1. ^ ISC (2022), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 9.1, International Seismological Centre
  2. ^
    S2CID 129302616
    .
  3. ^ "The 1997, Cariaco, Eastern Venezuela Earthquake" (EERI Special Earthquake Report). Earthquake Engineering Research Institute. October 1997. Retrieved 1 September 2021.
  4. ^ "CUMANA VICTIMS TELL QUAKE STORY". The New York Times Archives. Associated Press. 20 January 1929. p. 6.
  5. S2CID 129667818
    .
  6. doi:10.3133/ofr0018.{{cite book}}: CS1 maint: multiple names: authors list (link
    )
  7. ISSN 0767-2896
    .
  8. ^ Mirna Guevara (2014). "SIMULACIÓN NUMÉRICA DEL TSUNAMI ASOCIADO ALTERREMOTO DEL 17 DE ENERO DE 1929 EN LA CIUDAD DECUMANÁ, UNA CONTRIBUCIÓN A LOS ESTUDIOS DE RIESGO ENLAS COSTAS VENEZOLANAS" [NUMERICAL SIMULATION OF THE TSUNAMI ASSOCIATED WITH THEEARTHQUAKE OF JANUARY 17, 1929 IN THE CITY OFCUMANÁ, A CONTRIBUTION TO RISK STUDIES IN THE VENEZUELAN COASTS] (PDF) (in Spanish). Caracas, Venezuela. {{cite journal}}: Cite journal requires |journal= (help)
  9. ^ a b James F. Lander; Lowell S. Whiteside; Patricia A. Lockridge (2002). "A brief of tsunamis in the Caribbean Sea" (PDF). Science of Tsunami Hazards. 20 (2): 57-94.
  10. doi:10.1016/j.crte.2015.10.001
    .
  11. ISBN 980-6069-11-0
    .
  12. ^ "TERREMOTO DE CUMANÁ". Sucre Turística. Retrieved 1 September 2021.
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