La Dina Fault

La Dina Fault
La Dina Fault
Falla La Dina, El Agrado-Betania Fault
Coordinates	02°55′52″N 75°25′36″W / 2.93111°N 75.42667°W
Country	Colombia
Region	Andean
State	Huila, Tolima
Characteristics
Range	Central Ranges, Andes
Part of	Andean oblique faults
Length	206.9 km (128.6 mi)
Strike	032.9 ± 13
Dip	West
Dip angle	40-60
Displacement	0.2–1 mm (0.0079–0.0394 in)/yr
Tectonics
Plate	North Andean
Status	Inactive
Type	Oblique thrust fault
Movement	Dextral reverse
Rock units	Honda Gp., Chicoral Gp., Olini Gp., Saldaña Fm.
Age	Quaternary
Orogeny	Andean

La Dina Fault (Spanish: Falla La Dina) is a regional dextral oblique thrust fault in the departments of Huila and Tolima in southwestern Colombia. The fault has a total length of 206.9 kilometres (128.6 mi) and runs along an average northeast to southwest strike of 032.9 ± 13 in the Upper Magdalena Valley and the Central Ranges of the Colombian Andes.

Description[edit]

La Dina Fault lies east of La Plata Fault in southwestern Colombia. The fault displaces Jurassic (Saldaña Formation), Cretaceous (Chicoral and Olini Groups), and Tertiary (Honda Group) sedimentary rocks, which are common in the Upper Magdalena Valley. Local names assigned to the southern extension of this fault are from north to south: Betania, Pital-Agredo and Magdalena.^[1] It is also called the El Agrado-Betania Fault in Huila, where it underlies the Betania Reservoir.^[2] The fault is marked by well-developed trace, abrupt slope changes, saddles, and small scarps.^[1]

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.

Marquínez, Germán, and Francisco Velandia. 2001. Mapa Geológico del Huila 1:300,000, 1. INGEOMINAS. Accessed 2017-09-21.
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.