Publication: Modelo cinemático actual de la Placa Caribe en la confluencia con la Placa Norteamericana y la Placa de Cocos
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2008
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Sociedad Geológica de España.
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Abstract
Este trabajo propone un modelo cinemático en la zona más occidental de la Placa Caribe, en los límites con la Placa Norteamericana y la Placa de Cocos. Para ello se ha realizado un análisis cluster de la sismicidad presente en la zona en función de: 1) su distribución espacial y 2) de la dirección de máximo acortamiento horizontal (ey), obtenidas del análisis de las construcciones de sus mecanismos focales mediante métodos de análisis poblacional de fallas. En total, se han considerado 57 de los 488 sismos con construcción del mecanismo focal situados en la zona. Los resultados obtenidos, tanto de los tensores, como de las trayectorias de deformación sugieren un modelo caracterizado por la rotación de ey en los límites de esta placa con la Placa Norteamérica y en la zona del Arco Volcánico Centroamericano. Esta rotación es congruente con un movimiento lateral hacia el ESE del área más occidental de la Placa Caribe, produciendo una extensión asociada a este movimiento en la zona central del Bloque de Chortis. Este modelo corrobora la existencia de un bloque tectónico costero en la Placa Caribe independiente del Bloque de Chortis (Forearc Sliver).
This work proposes a present day kinematic tectonic model for the western part of the Caribbean Plate in relationship at its boundary with the North American and Cocos plates. We have performed the following cluster analysis of the instrumental seismicity within the area: 1) the spatial distribution of focal mechanism solutions and 2) the orientation of the maximum horizontal shortening (ey). Both studies come from the analysis of focal mechanisms by using the fault population technique. From the original available 488 earthquakes with focal mechanism (HCMT online database), we have considered 57 of them according to several criteria. Our results show a clockwise rotation of the ey trajectory across the boundary between Caribbean and North American plates and the Central American Volcanic Arc. This rotation agrees with a lateral tectonic movement towards ESE of the Chortis Block (Caribbean Plate). Furthermore, this model corroborates the existence of a coastal tectonic block within the Caribbean Plate that it is independent from the Chortis Block.
This work proposes a present day kinematic tectonic model for the western part of the Caribbean Plate in relationship at its boundary with the North American and Cocos plates. We have performed the following cluster analysis of the instrumental seismicity within the area: 1) the spatial distribution of focal mechanism solutions and 2) the orientation of the maximum horizontal shortening (ey). Both studies come from the analysis of focal mechanisms by using the fault population technique. From the original available 488 earthquakes with focal mechanism (HCMT online database), we have considered 57 of them according to several criteria. Our results show a clockwise rotation of the ey trajectory across the boundary between Caribbean and North American plates and the Central American Volcanic Arc. This rotation agrees with a lateral tectonic movement towards ESE of the Chortis Block (Caribbean Plate). Furthermore, this model corroborates the existence of a coastal tectonic block within the Caribbean Plate that it is independent from the Chortis Block.