Usme Fault

Usme Fault
Falla de Usme
Etymology	Usme
Coordinates	04°20′03.9″N 74°12′11.2″W / 4.334417°N 74.203111°W / 4.334417; -74.203111
Country	Colombia
Region	Andean
State	Cundinamarca
Cities	Bogotá
Characteristics
Range	Eastern Ranges, Andes
Part of	Andean oblique faults
Length	64.9 km (40.3 mi)
Strike	022.7 ± 6
Dip	East
Dip angle	High
Displacement	1–5 mm (0.039–0.197 in)/yr
Tectonics
Plate	North Andean
Status	Active
Earthquakes	Possibly historic
Type	Oblique normal fault
Movement	Dextral
Age	Quaternary
Orogeny	Andean

The Usme Fault (Spanish: Falla de Usme) is a dextral oblique normal fault in the department of Cundinamarca in central Colombia. The fault has a total length of 64.9 kilometres (40.3 mi) and runs along an average north-northeast to south-southwest strike of 022.7 ± 6 in the Eastern Ranges of the Colombian Andes.

The fault is named after Usme, southern locality of the Colombian capital Bogotá.^[1]

The Usme Fault is located in the Eastern Ranges of the Colombian Andes, south of Bogotá and extends along the western margin of the Tunjuelo River valley.^[1] The fault underlies the Sumapaz Páramo.^[2] The fault displaces Cretaceous and Tertiary rocks as well as Quaternary alluvial and glacial (moraine) deposits.^[1]

The fault valley shows features suggesting a half-graben with a steep slope wall on the west and low-angle slope on the east. The fault forms a steep, prominent circa 40 metres (130 ft) high east-facing scarp on Cretaceous rocks that show initial development of triangular facets. The hanging valleys have Quaternary alluvial deposits on the western uplifted block. The scarp forms the western wall of a narrow and long valley. To the south of Bogotá, it appears that Pleistocene moraines are offset as recorded by east-facing well-preserved scarps about 3 metres (9.8 ft) high.^[3]

• List of earthquakes in Colombia
• Bogotá Fault
• Vianí Fault
• Eastern Frontal Fault System

• 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

• 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