Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/3179
Authors: | Tibaldi, A.* Rovida, A.* Corazzato, C.* |
Title: | Late Quaternary kinematics, slip-rate and segmentation of a major Cordillera-parallel transcurrent fault: The Cayambe-Afiladores-Sibundoy system, NW South America | Journal: | Journal of Structural Geology | Series/Report no.: | /29 (2007) | Publisher: | Elsevier | Issue Date: | 2007 | DOI: | 10.1016/j.jsg.2006.11.008 | Keywords: | Active fault Seismicity Slip-rate calculation Colombia Ecuador |
Subject Classification: | 04. Solid Earth::04.04. Geology::04.04.09. Structural geology | Abstract: | We describe the recent activity of the Cayambe-Afiladores-Sibundoy Fault (CASF) and recognise it as one of the major potential active structures of northwestern South America, based on field observations, stereoscopic aerial photos of offset late Pleistocene-Holocene deposits and landforms, and crustal seismic activity. The CASF runs for at least 270 km along the sub-Andean zone of northern Ecuador and southern Colombia. We measured systematic latest Pleistocene-Holocene right-lateral strike-slip motion and right-lateral reverse motion consistent with earthquake focal mechanism solutions, and estimated a 7.7 +/- 0.4 to 11.9 +/- 0.7 mm/yr slip-rate. Magnitudes of the earthquakes that could be generated by possible fault-segment reactivation range up to M 7.0 +/- 0.1. The CASF should be considered as a major source of possible future large magnitude earthquakes, presenting a seismic hazard for the densely populated regions to the west. The CASF is part of the tectonic boundary of the North Andean block escaping NNE-wards with respect to the stable South American plate. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
JStructGeol_29.pdf | Article | 4.78 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
23
checked on Feb 10, 2021
Page view(s)
160
checked on Apr 24, 2024
Download(s)
32
checked on Apr 24, 2024