1819 Copiapó earthquake

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Coordinates: 27°00′S 71°30′W / 27.0°S 71.5°W / -27.0; -71.5
Source: Wikipedia, the free encyclopedia.
1819 Copiapó earthquake
1819 Copiapó earthquake is located in Chile
Huasco
Huasco
Concepción
Concepción
Copiapó
Copiapó
1819 Copiapó earthquake
Local date11 April 1819 (1819-04-11)
Local time15:00
Magnitude8.5 Mw
Epicenter27°00′S 71°30′W / 27.0°S 71.5°W / -27.0; -71.5
Areas affectedCopiapó Province, Chile
TsunamiYes
CasualtiesUnknown

During April 1819, the area around Copiapó in northern Chile was struck by a sequence of earthquakes over a period of several days. The largest of these earthquakes occurred on 11 April at about 15:00 local time, with an estimated magnitude of Mw 8.5. The other two events, on 3 April between 08:00 and 09:00 local time and on 4 April at 16:00 local time, are interpreted as foreshocks to the mainshock on 11 April. The mainshock triggered a tsunami that affected 800 km of coastline and was also recorded at Hawaii. The city of Copiapó was devastated.[1]

Tectonic setting

Northern Chile lies above the

destructive plate boundary where the Nazca Plate is being subducted beneath the South American Plate along the line of Peru–Chile Trench at about 8 cm per year.[2] This part of the boundary is associated with many large megathrust earthquakes, including those in 1420 and 1922.[3]

Earthquake sequence

The magnitudes of the two foreshocks is not known. The magnitude of the mainshock has been estimated to be Mw  8.5.[3] The earthquake sequence is thought to have ruptured the same part of the plate boundary as that ruptured by the 1922 Vallenar earthquake.[4]

Tsunami

The tsunami triggered by the 11 April mainshock affected at least 800 km of the Chilean coastline, with a maximum run-up height of 4 m and a maximum inundation of 600 m. Places affected included

Kahului and Molokai. It may also have been observed at Mangareva in French Polynesia.[5]

Impact

The earthquake sequence caused major damage in both Copiapó and Vallenar.[4] The 3 April foreshock led to widespread damage in Copiapó. The 4 April foreshock caused the collapse of several buildings in the city including a church, killing "many people".[6] The effects of the mainshock on 11 April and its associated tsunami, combined with those of the foreshocks was the complete destruction of Copiapó and Caldera.

See also

References

  1. doi:10.7289/V5TD9V7K
    .
  2. doi:10.1785/0120080192. Archived from the original
    (PDF) on 24 July 2011.
  3. ^
    S2CID 182657772
    .
  4. ^
    doi:10.1016/S0895-9811(98)00005-4
    .
  5. doi:10.7289/V5TD9V7K
    .
  6. doi:10.7289/V5TD9V7K
    .
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