The Vianí Fault ( es, Falla de Vianí) is a dextral oblique thrust fault in the

department Department may refer to: * Departmentalization, division of a larger organization into parts with specific responsibility Government and military *Department (administrative division), a geographical and administrative division within a country, ...

of Cundinamarca in central

Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Car ...

. The fault has a total length of and runs along an average northwest to southeast strike of 055.5 ± 15 in the Eastern Ranges of the Colombian Andes.

Etymology

The fault is named after

Vianí Vianí is a municipality and town of Colombia in the department Department may refer to: * Departmentalization, division of a larger organization into parts with specific responsibility Government and military *Department (administrative divi ...

, Cundinamarca.Paris et al., 2000a, p.48

Description

The Vianí Fault is located on the western slope of the Eastern Ranges of the Colombian Andes. The fault places Lower Cretaceous rocks of the

Villeta Group The Villeta Group ( es, Grupo Villeta) is a geological group of the Eastern Ranges of the Colombian Andes, to the west of the Altiplano Cundiboyacense. The group, a sequence of shales, limestones and sandstones, is subdivided into various formati ...

( Trincheras,

Simijaca Simijaca () is a town and municipality in the Ubaté Province, part of the Cundinamarca Department, Colombia. The town centre is located at an altitude of on the Altiplano Cundiboyacense at from the capital Bogotá. Simijaca borders the Boyacá D ...

, Hiló and

Capotes Formation The Capotes Formation ( es, Formación Capotes, Kic) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of calcareous black shales containing gypsum and ammonites and dates to th ...

s), to the northwest against Upper Cretaceous rocks of the Güagüaquí Group to the southeast. In the southern area of the fault, the north–south oriented Vianí Fault thrusts the Seca Formation on top of the Hoyón Formation. Farther to the north at Vianí, the fault strike changes to northeast–southwest and the fault displaces the Bituima Fault.Plancha 227, 1998 The fault trace is characterised by offset spurs, degraded fault scarps, saddles, small

pull-apart basin In geology, a basin is a region where subsidence generates accommodation space for the deposition of sediments. A pull-apart basin is a structural basin where two overlapping (en echelon) strike-slip faults or a fault bend creates an area of cru ...

s, aligned drainage, and deflected streams. The fault borders the Guaduas Synclinal to the east and south.Acosta & Ulloa, 2001, p.71 It forms the northwestern boundary of the Bogotá savanna. A maximum moment magnitude earthquake is estimated to be 7.2 on the basis of probable rupture of entire fault length. The slip rate is estimated at per year based on offset morphologic and neotectonic features.

References

Bibliography

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Maps

* * {{DEFAULTSORT:Viani Fault Seismic faults of Colombia Thrust faults Strike-slip faults Inactive faults Faults Faults

Etymology

Description

See also

References

Bibliography

Maps