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| Bárbula Fault | |
|---|---|
| Name | Bárbula Fault |
| Location | Venezuela, Caribbean Plate margin |
| Type | Strike-slip / thrust (complex) |
| Length | ~100 km (mapped segments) |
| Coordinates | ~10°N, 67°W |
| Region | Aragua, Carabobo, Lara, Yaracuy |
Bárbula Fault
The Bárbula Fault is a major crustal fault system in northwestern Venezuela linked to plate boundary deformation along the northern South American margin, with mapped traces near Valencia, Venezuela, Caracas, Maracay, Puerto Cabello, and the Tocuyo River. It forms part of a network of structures that accommodate motion between the Caribbean Plate and the South American Plate, interacting with regional features such as the Boconó Fault System, the El Pilar Fault, and the Magdalena Valley Basin. Its study involves investigators from institutions including the Venezuelan Institute for Scientific Research, the Central University of Venezuela, the Simón Bolívar University, and international groups from the United States Geological Survey, the Instituto Geográfico Nacional (Spain), and the University of Cambridge.
The fault cuts Paleogene to Quaternary stratigraphy of the Cordillera de la Costa Montane System and adjacent basins including the Valencia Basin and the Tocuyo Depression, juxtaposing igneous units of the Eastern Venezuelan Basin with Mesozoic sedimentary sequences of the La Luna Formation and alluvial deposits of the Lake Valencia catchment. Structural mapping documents strike-slip kinematics with reverse components along splays that link to thrust sheets in the Sierra de Aroa and fold belts associated with the Andes orogeny and the Caribbean–South American collision. Lithologies displaced across the fault include Cretaceous carbonates, Oligocene turbidites, and Miocene volcaniclastic rocks of the Mérida Andes hinterland.
The fault lies within the complex plate interaction zone where the Caribbean Plate converges obliquely with the South American Plate, producing strike-slip systems like the Boconó Fault System, the transpressional El Pilar Fault, and regional pull-apart basins such as the Maracaibo Basin. Regional deformation is influenced by the westward escape of crustal blocks linked to the Cauchari Fault sense of motion and the restraining bends associated with the Perijá and Sierra Nevada de Santa Marta structural highs. Geodynamic models incorporate constraints from paleomagnetism studies at the Geological Society of America meetings and GPS campaigns by the International GNSS Service and the Seismological Society of America.
Instrumental seismicity in the region records earthquakes cataloged by the U.S. Geological Survey, the Inameh monitoring networks, and historical archives referencing events that affected Valencia, Caracas, and Puerto Cabello. Paleoseismological trenches reveal Holocene surface-rupturing events correlated with stratigraphic disturbances similar to ruptures on the Boconó Fault and the San Sebastián Fault; radiocarbon ages from charcoal samples tied to chronologies used by the Smithsonian Institution indicate late Quaternary activity. Seismic hazard models incorporate source parameters used by the Global Seismic Hazard Assessment Program and input from regional studies published in journals of the Geological Society of London and the American Geophysical Union.
The fault produces linear escarpments, aligned river deflections along the Tocuyo River and the Aragua River, shutter ridges near Naguanagua, fault-related sag ponds in the Lake Valencia basin, and localized uplift forming scarps at the margins of the Sierra de Portuguesa foothills. Surface morphology is mapped using remote sensing from Landsat, Sentinel-1, and aerial LiDAR surveys conducted in collaboration with the European Space Agency and the National Aeronautics and Space Administration, which reveal subtle offsets of Quaternary alluvium and terrace treads analogous to offsets documented on the San Andreas Fault and the North Anatolian Fault.
Early reconnaissance reports by geologists associated with the Compañía Anónima de Hidrocarburos de Venezuela and 20th-century surveys by the Servicio Geológico de Venezuela identified linear features later attributed to the fault. Systematic mapping and kinematic analysis advanced with contributions from researchers at the Central University of Venezuela, the Universidad de Los Andes (Venezuela), and international collaborators from the University of Texas at Austin and the University of Bristol. Key publications appeared in proceedings of the Geological Society of America and regional symposia hosted by the Latin American Geophysical Society, while recent high-resolution studies leveraged datasets archived by the International Seismological Centre.
The fault poses seismic risk to population centers including Valencia, Venezuela, Maracay, and Puerto Cabello, infrastructure such as the Autopista Regional del Centro, and industrial facilities in the Puerto Cabello port and nearby petrochemical complexes. Risk assessments by civil protection agencies integrate probabilistic seismic-hazard analyses modeled on standards from the World Bank and the Inter-American Development Bank, emergency planning by the National Institute of Civil Protection (Venezuela), and urban resilience frameworks promoted by the United Nations Office for Disaster Risk Reduction. Mitigation measures hinge on seismic microzonation, retrofitting of critical lifelines, and incorporation of active-fault maps into land-use planning overseen by municipal authorities in Carabobo and Aragua states.
Category:Geology of Venezuela Category:Seismic faults of South America