Present-day deformation along the El Pilar Fault in eastern Venezuela: Evidence of creep along a major transform boundary |
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| Authors: | Franois Jouanne Franck A Audemard Christian Beck Aurlien Van Welden Reinaldo Ollarves Carlos Reinoza |
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| Institution: | a Université de Savoie, LGCA, UMR CNRS 5025, Campus Scientifique, F73376, Le Bourget du Lac, France;b Venezuelan Foundation for Seismological Research, FUNVISIS, Final Prolongación Calle Mara, Quinta Funvisis, El Llanito, Caracas 1073, Venezuela |
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| Abstract: | The right-lateral strike-slip El Pilar Fault is one of the major structures that accommodate the relative displacement between the Caribbean and South-America Plates. This fault, which trends East–West along the northeastern Venezuela margin, is a seismogenic source, and shows numerous evidence for active tectonics, including deformation of the Quaternary sediments filling the Cariaco Gulf. Because the main El Pilar Fault strand belongs to a set of strike-slip faults and thrusts between the stable Guyana shield (South) and the Caribbean oceanic floor (North), a GPS network was designed and installed to measure the relative motion of the El Pilar Fault and other faults. The results obtained from the comparison of 2003 and 2005 surveys indicate: (i) a lack of significant displacement (especially shortening) in the Serrania del Interior (Neogene cordillera overthrusted above the Guyana craton), (ii) an eastward displacement (relative to fixed south America plate) up to 22 mm/year of benchmarks located north of the El Pilar Fault. |
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| Keywords: | Caribbean El Pilar Fault GPS Relative motion Creep |
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