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Bahía Solano Fault
Bahía Solano Fault
Falla Bahía Solano, Utría Fault, Utría-Bahía Solano Fault
	ShakeMap of the 1970 Bahía Solano earthquake
Etymology	Bahía Solano
Coordinates	05°53′13″N 77°21′47″W / 5.88694°N 77.36306°W
Country	Colombia
Region	Pacific/Chocó
State	Chocó
Cities	Nuquí
Characteristics
Range	Serranía del Baudó
Part of	Pacific thrust faults
Length	290.6 km (180.6 mi)
Width	up to 5 km (3.1 mi)
Strike	347 ± 13
Dip	West
Dip angle	unknown
Displacement	0.2–1 mm (0.0079–0.0394 in)/yr
Tectonics
Plate	Panama, Coiba, North Andean
Status	Active
Earthquakes	1970 Bahía Solano (Mw  6.5)
Type	Thrust fault
Movement	Reverse
Rock units	Uva Formation, Baudó Basalt
Age	Quaternary
Orogeny	Andean

The Bahía Solano Fault (Spanish: Falla Bahía Solano), Utría Fault or Utría-Bahía Solano Fault is a westward dipping thrust fault in the department of Chocó on the Pacific Coast of Colombia. The fault has a total length of 290.6 kilometres (180.6 mi) and runs along an average north–south strike of 347 ± 13 from the Panama-Colombia border to Bajo Baudó. The fault is partly offshore in the bays of Solano and Utría and crosses the Chocó Basin and the coastal Serranía del Baudó. Movement of the fault produced the M_w  6.5 1970 Bahía Solano earthquake.

Etymology

The fault is named after Bahía Solano, Chocó.^[1]

Description

The Bahía Solano Fault extends along the Pacific Coast of Colombia, bordering the Panama, Coiba, Malpelo and North Andes Plates.^[2] It bounds a structural valley between the Solano Bay and Utría Bay, and displaces the Eocene turbidites of the Uva Formation in the south,^[3]^[4]^[5] and Cretaceous oceanic Baudó Basalts in the north,^[6]^[7]^[8]^[9] The fault forms a well developed and continuous fault line (scarp),^[1] and the brecciated zone of the fault reaches 5 kilometres (3.1 mi) in width.^[10] The peninsulas of Cabo Corrientes and Bahía Solano are composed of oceanic crust displaced by the Bahía Solano Fault.^[11]

Segments of the fault have been called Utría Fault,^[4]^[5]^[7]^[9]^[11] and Utría-Bahía Solano Fault.^[8]

Activity

The slip rate of the fault is estimated at between 0.2 and 1 millimetre (0.0079 and 0.0394 in) per year.^[1] The fault is active and produced the 1970 Bahía Solano earthquake with a moment magnitude of 6.5 and a depth of 15 km (9.3 mi).^[12]^[13] The earthquake was followed by 123 aftershocks in the period from September 26 to October 7, 1970.^[14]

References

^ ^a ^b ^c Paris et al., 2000, p.16
^ Zhang et al., 2017
^ Galvis Vergara, 1980, p.10
^ ^a ^b Plancha 183, 2002
^ ^a ^b Plancha 202, 2002
^ Galvis Vergara, 1980, p.23
^ ^a ^b Plancha 127, 2002
^ ^a ^b Plancha 143, 2002
^ ^a ^b Plancha 163, 2002
^ Galvis Vergara, 1980, p.31
^ ^a ^b Galvis Vergara, 1980, p.34
^ Ramírez, 1975, p.207
^ USGS. "M 6.5 - near the west coast of Colombia". United States Geological Survey. Retrieved 2017-09-18.
^ Ramírez, 1975, p.208

Bibliography

Galvis Vergara, Jaime (1980), "Un arco de islas terciario en el occidente colombiano" (PDF), Geología Colombiana, 11: 7–43, retrieved 2017-09-20
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
Ramírez, Jesús Emilio (1975), Historia de los terremotos en Colombia, Instituto Geográfico Agustín Codazzi, pp. 1–250
Zhang, Tuo; Gordon, Richard G.; Mishra, Jay K.; Wang, Chengzu (2017), "The Malpelo Plate Hypothesis and implications for nonclosure of the Cocos-Nazca-Pacific plate motion circuit", Geophysical Research Letters, 44 (16): 1–6, doi:10.1002/2017GL073704