Rosas-Julumito Fault
Rosas-Julumito Fault | ||
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Falla de Rosas-Julumito | ||
Age Quaternary | | |
Orogeny | Andean |
The Rosas-Julumito Fault (
Etymology
The fault is named after Rosas, Cauca and vereda Julumito of Popayán.[1]
Description
The Rosas-Julumito Fault is part of the Romeral Fault System. It is a rather short section of about 43 kilometres (27 mi) length, 17 kilometres (11 mi) of which have active tectonic movement. The fault section parallels the Cauca-Almaguer Fault, which is one of the largest older fracture zones in western Colombia. The Rosas-Julumito fault runs about 5 kilometres (3.1 mi) west of the city of
The fault section runs through the smooth but hilly topography that is formed by sediments of the Popayán Formation. The fault morphology is easily observed on aerial photographs and satellite images and from aircraft. The most noticeable features are fault saddles, ponded
Activity
The fault is associated with the devastating 1983 Popayán earthquake (Mw 5.5) that caused more than 300 fatalities. During the 1983 earthquake, several cracks with generally north trends developed at the surface in an area 2 kilometres (1.2 mi) wide and 2.5 kilometres (1.6 mi) long, north of Popayán. Individual cracks were a few meters to tens of meters long and few millimeters in width. A maximum moment magnitude of 6.8 is assumed for this fault using only 17 kilometres (11 mi) for its probable total surface rupture length.[1]
See also
References
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.
Further reading
- Page, W.D. 1986. Seismic geology and seismicity of Northwestern Colombia, 1–200. San Francisco, California, Woodward-Clyde Consultants Report for ISA and Integral Ltda., Medellín.