Córdoba-Navarco Fault

Córdoba-Navarco Fault
Córdoba-Navarco Fault
Falla Córdoba-Navarco
Etymology	Córdoba & Navarco River
Coordinates	04°20′34″N 75°42′08″W / 4.34278°N 75.70222°W
Country	Colombia
Region	Andean
State	Quindío
Characteristics
Range	Central Ranges
Part of	Romeral Fault System
Length	21.2 km (13.2 mi)
Strike	018.5 ± 4
Dip	Vertical
Displacement	<0.2 mm (0.0079 in)/yr
Tectonics
Plate	North Andean
Status	Active
Earthquakes	1999 Armenia (Mw 6.1)
Type	Strike-slip fault
Movement	Sinistral
Rock units	Córdoba & Quebradagrande Complexes
Age	Quaternary
Orogeny	Andean

The Córdoba-Navarco Fault (Spanish: Falla Córdoba-Navarco) is a sinistral strike-slip fault in the department of Quindío in west-central Colombia. The fault has a total length of 21.2 kilometres (13.2 mi) and runs along an average north-northeast to south-southwest strike of 018.5 ± 4 in the Central Ranges of the Colombian Andes.

The fault segment pertaining to the megaregional Romeral Fault System is a set of two faults that are active, causing the major 1999 Armenia earthquake with approximately 1185 fatalities.

Etymology

The fault is named after Córdoba and the Navarco River in Quindío.^[1]

Description

The fault section is formed by the Córdoba and Navarco Faults, which are eastern strands of Romeral Fault System, south of the city of Armenia. These faults lie within the epicenter area of the Armenia earthquake of January 25, 1999. The faults extend through sheared cataclastic and undeformed basaltic and sedimentary Cretaceous oceanic rocks, cropping out on the eastern slope of the Central Ranges of Colombia.^[1] It separates the Córdoba Complex from the Quebradagrande Complex.^[2]

Well preserved fault trace controls stream drainages. The Córdoba-Navarco Fault forms fault saddles and eroded fault scarps. Neotectonic features are not very outstanding. Slopes in this part of the Central Ranges are rather steep, so erosion rate is high.^[1]

The fault terminates in the south against the Ibagué Fault.^[3]

Activity

On January 25, 1999, a major earthquake hit the capitals of Quindío, Armenia, and Risaralda, Pereira. The earthquake had a moment magnitude of 6.1 and an intensity of X and occurred at a depth of 17.0 kilometres (55,800 ft).^[4] The natural disaster caused around 1185 casualties in central Colombia and was the strongest earthquake in 16 years.^[5]

References

^ ^a ^b ^c Paris et al., 2000a, p.25
^ Mapa Geológico de Quindío, 2000
^ Paris et al., 2000b
^ USGS. "M 6.1 - Colombia". United States Geological Survey. Retrieved 2017-09-18.
^ Various Authors, 1999, p.10

Bibliography

Paris, Gabriel; Machette, Michael N.; Dart, Richard L.; Haller, Kathleen M. (2000a), Map and Database of Quaternary Faults and Folds in Colombia and its Offshore Regions (PDF), USGS, pp. 1–66, retrieved 2017-09-18
Various, Authors (1999), El terremoto de enero de 1999 en Colombia: Impacto socioeconómico del desastre en la zona del Eje Cafetero (PDF), CEPAL, pp. 1–89, retrieved 2017-09-24

Maps

Paris, Gabriel; Machette, Michael N.; Dart, Richard L.; Haller, Kathleen M. (2000b), Map of Quaternary Faults and Folds of Colombia and Its Offshore Regions (PDF), USGS, p. 1, retrieved 2017-09-18
Mosquera, D (2000), Mapa Geológico de Quindío 1:100,000, INGEOMINAS, p. 1, retrieved 2017-09-21

[Paris2000_p25-1] Paris et al., 2000a, p.25

[MapaQuindio-2] Mapa Geológico de Quindío, 2000

[Paris2000b-3] Paris et al., 2000b

[1999Armenia-4] USGS. "M 6.1 - Colombia". United States Geological Survey. Retrieved 2017-09-18.

[CEPAL_p10-5] Various Authors, 1999, p.10

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