Tucurá Fault

Tucurá Fault
Tucurá Fault
Falla de Tucurá
Etymology	Tucurá
Coordinates	07°40′40″N 76°30′00″W / 7.67778°N 76.50000°W
Country	Colombia
Region	Andean, Caribbean
State	Antioquia, Córdoba
Cities	Dabeiba
Characteristics
Range	Sinú-San Jacinto Basin, Central Ranges, Andes
Part of	Andean thrust faults
Length	74.3 km (46.2 mi)
Strike	356 ± 4
Dip	East
Dip angle	70-80
Displacement	0.2–1 mm (0.0079–0.0394 in)/yr
Tectonics
Plate	North Andean
Status	Active
Earthquakes	12 February 1952 (MW 6.7); 3 December 1970 (MW 5.7); 31 August 1977 (MW 5.7)
Type	Thrust fault
Movement	Oblique slightly sinistral reverse
Age	Quaternary
Orogeny	Andean

The Tucurá Fault (Spanish: Falla de Tucurá) is a thrust fault in the departments of Córdoba and Antioquia in northern Colombia. The fault has a total length of 74.3 kilometres (46.2 mi) and runs along an average north-northwest to south-southeast strike of 356 ± 4 in the Sinú-San Jacinto Basin and the Central Ranges of the Colombian Andes. The fault is considered active because of three M_W 5.7-6.7 earthquakes associated with the Tucurá Fault occurring in the twentieth century.

Etymology

The fault is named after Tucurá.^[1]

Description

The Tucura Fault is located in the northern part of the Central Ranges of the Colombian Andes, west of the Romeral Fault System. It extends from the Paderisco River in the south to the Sinú Valley in the north, where it crosses the Serranía de Abibe. The fault crosscuts middle and upper Tertiary folded marine sedimentary rocks and Quaternary alluvial deposits. The fault controls drainage, forms linear ridges, topographic lineaments, and fault scarps about 4 metres (13 ft) high on Quaternary terraces south of the town of Dabeiba, Antioquia. There are strong linear features on the right margin of the Esmeralda and Sinú Rivers; these include fault saddles and slight slope changes in alluvial terraces. Tertiary rock units are thrust over Quaternary deposits and striae are found on the shear planes.^[1]

The fault is probably active with three earthquakes occurring in the twentieth century in the vicinity of the fault, February 12, 1952 (M_W 6.7), December 3, 1970 (M_W 5.7) and August 31, 1977 (M_W 5.7). The slip rate is estimated at 0.2 to 1 millimetre (0.0079 to 0.0394 in) per year.^[1]