Usme Fault

04°20′03.9″N 74°12′11.2″W / 4.334417°N 74.203111°W / 4.334417; -74.203111Country ColombiaRegionAndeanStateCundinamarcaCitiesBogotáCharacteristicsRangeEastern Ranges, AndesPart ofAndean oblique faultsLength64.9 km (40.3 mi)Strike022.7 ± 6DipEastDip angleHighDisplacement1–5 mm (0.039–0.197 in)/yrTectonicsPlateNorth AndeanStatusActiveEarthquakesPossibly historicTypeOblique normal faultMovementDextralAgeQuaternaryOrogenyAndean

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.

Etymology

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

Description

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]

See also

  • flagColombia portal
  • Earth sciences portal
  • iconGeology portal

References

  1. ^ a b c Paris et al., 2000a, p.48
  2. ^ Paris et al., 2000b
  3. ^ Paris et al., 2000a, p.49

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.
  • v
  • t
  • e
Tectonic plates
Terranes
Terrane-bounding
fault systems
Intraterrane
faults
Chibcha
Tahamí
Caribe
La Guajira
  • Cuisa
Other terranes
  • Meta
  • Dagua-Calima
  • Guáitara
  • Morronegro-Las Mercedes
Major
earthquakes
Orogenies
Other topics
Sources
     Paris, Gabriel; Machette, Michael N.; Dart, Richard L.; Haller, Kathleen M. (2000). Map and Database of Quaternary Faults and Folds in Colombia and its Offshore Regions (PDF). USGS. pp. 1–66. Retrieved 2017-06-20.

      Gómez Tapias, Jorge; Montes Ramírez, Nohora E.; Almanza Meléndez, María F.; Alcárcel Gutiérrez, Fernando A.; Madrid Montoya, César A.; Diederix, Hans (2015). Geological Map of Colombia. Servicio Geológico Colombiano. pp. 1–212. Retrieved 2019-10-29.

      Various authors (2014). Enciclopedia de desastres naturales históricos de Colombia (PDF). Universidad del Quindío. pp. 1–21. Retrieved 2017-06-20.
Category • Images