Volume 4 Quaternary Chapter 13 Neogene https://doi.org/10.32685/pub.esp.38.2019.13 Quaternary Activity of the Bucaramanga Fault Published online 27 November 2020 in the Departments of Santander and Cesar Paleogene Hans DIEDERIX1* , Olga Patricia BOHÓRQUEZ2 , Héctor MORA–PÁEZ3 , 4 5 6 Juan Ramón PELÁEZ , Leonardo CARDONA , Yuli CORCHUELO , 1
[email protected] 7 8 Jaír RAMÍREZ , and Fredy DÍAZ–MILA Consultant geologist Servicio Geológico Colombiano Dirección de Geoamenazas Abstract The 350 km long Bucaramanga Fault is the southern and most prominent Grupo de Trabajo Investigaciones Geodésicas Cretaceous Espaciales (GeoRED) segment of the 550 km long Santa Marta–Bucaramanga Fault that is a NNW striking left Dirección de Geociencias Básicas Grupo de Trabajo Tectónica lateral strike–slip fault system. It is the most visible tectonic feature north of latitude Paul Krugerstraat 9, 1521 EH Wormerveer, 6.5° N in the northern Andes of Colombia and constitutes the western boundary of the The Netherlands 2
[email protected] Maracaibo Tectonic Block or microplate, the southeastern boundary of the block being Servicio Geológico Colombiano Jurassic Dirección de Geoamenazas the right lateral strike–slip Boconó Fault in Venezuela. The Bucaramanga Fault has Grupo de Trabajo Investigaciones Geodésicas Espaciales (GeoRED) been subjected in recent years to neotectonic, paleoseismologic, and paleomagnetic Diagonal 53 n.° 34–53 studies that have quantitatively confirmed the Quaternary activity of the fault, with Bogotá, Colombia 3
[email protected] eight seismic events during the Holocene that have yielded a slip rate in the order of Servicio Geológico Colombiano Triassic Dirección de Geoamenazas 2.5 mm/y, whereas a paleomagnetic study in sediments of the Bucaramanga alluvial Grupo de Trabajo Investigaciones Geodésicas fan have yielded a similar slip rate of 3 mm/y.