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Naya-Micay Fault
Naya-Micay Fault
Falla de Naya-Micay
Etymology	Naya & Micay Rivers
Location	Tumaco Basin
Coordinates	03°15′41.0″N 77°22′54.2″W / 3.261389°N 77.381722°W
Country	Colombia
Region	Pacific/Chocó
State	Cauca, Valle del Cauca
Characteristics
Part of	Pacific oblique faults
Length	158.2 km (98.3 mi)
Strike	034.1 ± 12
Dip	East
Dip angle	unknown
Displacement	0.2–1 mm (0.0079–0.0394 in)/yr
Tectonics
Plate	North Andean
Status	Inactive
Type	Oblique thrust fault
Movement	Dextral reverse
Age	Quaternary
Orogeny	Andean

The Naya-Micay Fault (Spanish: Falla de Naya-Micay) is a dextral oblique thrust fault in the departments of Cauca and Valle del Cauca in Colombia. The fault has a total length of 158.2 kilometres (98.3 mi) and runs along an average northeast to southwest strike of 034.1 ± 12 in the Tumaco Basin along the Pacific Coast of Colombia.

Etymology

The fault is named after the Naya and Micay Rivers.^[1]

Description

The Naya-Micay Fault runs parallel to and inland of the southwestern Pacific Coast of Colombia in the Cauca and Valle del Cauca departments from Guapi in the south to Buenaventura in the north.^[2] The fault displaces marine and non-marine Pliocene sedimentary rocks. It locally offsets undifferentiated Quaternary alluvial deposits. In general, there are uplifted Tertiary sediments on the east and Quaternary sediments on the western side of the fault. The fault appears to be a northern continuation of the Remolino-El Charco Fault. The fault controls drainage of the Guapi River, locally offsets Quaternary deposits, and forms folded paleosoils, elongated basins and ridges and has strong general linear features. Along the coast, it forms typical fault-controlled linear landforms.^[1]

References

^ ^a ^b Paris et al., 2000a, p.54
^ Paris et al., 2000b

Bibliography

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

Maps

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