30 December 1994 Kinematics and seismotectonics of a segment of the North America-Caribbean plate boundary: a remote sensing and field study of the Jocotan fault system in Guatemala
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Abstract
We studied the kinematics and the tectonics setting of the Guatemalan part of the Jocotan fault system (JFS), the southernmost of the three left-lateral fault systems considered to form the North America- Caribbean plate boundary. Remote sensing studies were carried out on standard false colour composite 1:250,000 and band 3 (near infrared) 1:250,000 Landsat MSS scenes and include a supervised morpho-structural classification and a statistical analysis of both volcano-tectonic and tectonic lineaments. The interpretation of these data revealed a clear left-lateral deformation pattern in the form of Riedel shear fractures with a dominant orientation 60 degree(s)N-75 degree(s)E at any length class of lineaments. Two NNE trending extensional structures, the Jocotan and the Chiquimula half-grabens, are located along the central part of the JFS and are interpreted as releasing bend structures associated with a change in the fault trend from ENE to E-W. Although the JFS appears a very marked feature, no definite evidences of recent active tectonic motions were detected. The field study confirmed that the JFS is a first order left-lateral strike-slip structure, which accommodated also a certain amount of southward thrusts. Field inspections along land fissures opened during the 1976 Guatemala earthquake indicated that they were likely due to gravitational failure triggered by the ground motion.
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Luca Ferrari, Luca Ferrari, Giorgio Pasquare, Giorgio Pasquare, Eugenio Zilioli, Eugenio Zilioli, } "Kinematics and seismotectonics of a segment of the North America-Caribbean plate boundary: a remote sensing and field study of the Jocotan fault system in Guatemala", Proc. SPIE 2320, Geology from Space, (30 December 1994); doi: 10.1117/12.197300; https://doi.org/10.1117/12.197300
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