Urrao Fault

Urrao Fault
	Falla de Urrao
Etymology	Urrao
Coordinates	06°23′08″N 76°04′58″W
Country	Colombia
Region	Andean
State	Antioquia
Characteristics
Range	Western Ranges, Andes
Part of	Andean oblique faults
Length	30.5 km (19.0 mi)
Strike	003.6 ± 1
Dip	Vertical
Displacement	0.2–1 mm (0.0079–0.0394 in)/yr
Tectonics
Plate	North Andean
Status	Inactive
Type	Oblique strike-slip fault
Movement	Normal sinistral
Age	Quaternary
Orogeny	Andean

The Urrao Fault (Spanish: Falla de Urrao) is a sinistral oblique strike-slip fault in the department of Antioquia in northwestern Colombia. The fault has a total length of 30.5 kilometres (19.0 mi) and runs along an average north to south strike of 003.6 ± 1 in the Western Ranges of the Colombian Andes.

Etymology

The fault is named after Urrao.[1]

Description

This set of two parallel faults extend along the axis of the Western Ranges of the Colombian Andes, close to the valleys of the Anacosca and Penderisco Rivers, and the plateau of the Frontino Páramo. Located to the west of the city of Medellín, the faults mainly displace Tertiary sedimentary rocks.[1] The west branch of the fault has mainly normal slip as observed from offset alluvial terraces. The fault forms spectacular fault scarps on terraces. These scarps are 10 kilometres (6.2 mi) long and as much as 50 metres (160 ft) high. Most of the fault trace has a moderate alignment of topographic features, such as linear streams and offset spurs. Quaternary alluvial sediments of the Penderisco River are offset an unknown amount. The slip rate is estimated at 0.2 to 1 millimetre (0.0079 to 0.0394 in) per year deduced from displaced Quaternary sediments.[2]

References

Paris et al., 2000, p.18
Paris et al., 2000, p.19

Bibliography

Paris, Gabriel; Michael N. Machette; Richard L. Dart, and Kathleen M. Haller. 2000a. Map and Database of Quaternary Faults and Folds in Colombia and its Offshore Regions, 1–66. USGS. Accessed 2017-09-18.

Maps

Paris, Gabriel; Michael N. Machette; Richard L. Dart, and Kathleen M. Haller. 2000b. Map of Quaternary Faults and Folds of Colombia and Its Offshore Regions, 1. USGS. Accessed 2017-09-18.