Search

Your search keyword '"Guzman-Speziale, M."' showing total 6 results
Start Over Author "Guzman-Speziale, M."
6 results on '"Guzman-Speziale, M."'

4. Fault kinematics in northern Central America and coupling along the subduction interface of the Cocos Plate, from GPS data in Chiapas (Mexico), Guatemala and El Salvador

Author

Franco, Aurore, Lasserre, Cécile, Lyon-Caen, H., Kostoglodov, Vladimir, Molina, E., Guzman-Speziale, M., Monterosso, D., Robles, V., Figueroa, C., Amaya, W., Barrier, Eric, Chiquin, L., Moran, S., Flores, O., Romero, J., Santiago, J.A., Manea, M., Manea, V.C., Laboratoire de géologie de l'ENS (LGE), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris), Institut des Sciences de la Terre (ISTerre), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF), Instituto de Geofísica, Universidad Nacional Autónoma de México (UNAM), Instituto Nacional de Sismologıa, Vulcanologıa, Meterologıa e Hidrologia, INSIVUMEH, Centro de Geosciencias, 6Coordinadora Nacional para la Reduccion de Desastres, CONRED, Instituto Geografico Nacional (IGN), Instituto Geografico y Catastro Nacional, Centro Nacional de Registros, Evolution et Modélisation des Bassins Sédimentaires (EMBS), Institut des Sciences de la Terre de Paris (iSTeP), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centro Universitario del Norte, Universidad de San Carlos de Guatemala, Centro de Estudios Superiores de Energia y Minas, Geologia Ambiental e Economia, Instituto de Geofisica [Mexico], Laboratoire de géologie de l'ENS (LGENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), and Centre National de la Recherche Scientifique (CNRS)-PRES Université de Grenoble-Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])

Subjects
Kinematics of crustal and mantle deformation, Seismic cycle, Plate motions, Dynamics and mechanics of faulting, Satellite geodesy, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Subduction zone processes
Abstract

International audience; New GPS measurements in Chiapas (Mexico), Guatemala and El Salvador are used to constrain the fault kinematics in the North America (NA), Caribbean (CA) and Cocos (CO) plates triple junction area. The regional GPS velocity field is first analysed in terms of strain partitioning across the major volcano-tectonic structures, using elastic half-space modelling, then inverted through a block model. We show the dominant role of the Motagua Fault with respect to the Polochic Fault in the accommodation of the present-day deformation associated with the NA and CA relative motion. The NA/CA motion decreases from 18-22 mm yr−1 in eastern Guatemala to 14-20 mm yr−1 in central Guatemala (assuming a uniform locking depth of 14-28 km), down to a few millimetres per year in western Guatemala. As a consequence, the western tip of the CA Plate deforms internally, with ≃9 mm yr−1 of east-west extension (≃5 mm yr−1 across the Guatemala city graben alone). Up to 15 mm yr−1 of dextral motion can be accommodated across the volcanic arc in El Salvador and southeastern Guatemala. The arc seems to mark the northern boundary of an independent forearc sliver (AR), pinned to the NA plate. The inversion of the velocity field shows that a four-block (NA, CA, CO and AR) model, that combines relative block rotations with elastic deformation at the block boundaries, can account for most of the GPS observations and constrain the overall kinematics of the active structures. This regional modelling also evidences lateral variations of coupling at the CO subduction interface, with a fairly high-coupling (≃0.6) offshore Chiapas and low-coupling (≃0.25) offshore Guatemala and El Salvador.

Published
2012
Full Text
View/download PDF

5. Fault kinematics in northern Central America and coupling along the subduction interface of the Cocos Plate, from GPS data in Chiapas (Mexico), Guatemala and El Salvador

Author

Laboratoire de géologie de l'ENS (LGE) ; CNRS - INSU - École normale supérieure [ENS] - Paris, Institut des sciences de la Terre (ISTerre) ; INSU - OSUG - Université de Savoie - Université Joseph Fourier - Grenoble I - IFSTTAR - Institut de recherche pour le développement [IRD] : UR219 - CNRS, Instituto de Geofísica ; UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO, Instituto Nacional de Sismologıa, Vulcanologıa, Meterologıa e Hidrologia ; INSIVUMEH, Centro de Geosciencias ; Universidad Nacional Autónoma de México (UNAM), 6Coordinadora Nacional para la Reduccion de Desastres ; CONRED, Instituto Geografico Nacional ; IGN, Instituto Geografico y Catastro Nacional ; Centro Nacional de Registros, Laboratoire de tectonique (LT) ; CNRS - INSU - Université de Cergy Pontoise - Université Pierre et Marie Curie (UPMC) - Paris VI, Centro Universitario del Norte ; Universidad de San Carlos de Guatemala, Centro de Estudios Superiores de Energia y Minas ; Universidad de San Carlos de Guatemala, Geologia Ambiental e Economia ; Geologia Ambiental e Economia, Instituto de Geofísica (IG) ; UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO, Franco, Aurore, Lasserre, Cécile, Lyon-Caen, H., Kostoglodov, Vladimir, Molina, E., Guzman-Speziale, M., Monterosso, D., Robles, V., Figueroa, C., Amaya, W., Barrier, E., Chiquin, L., Moran, S., Flores, O., Romero, J., Santiago, J.A., Manea, M., Manea, V.C., Laboratoire de géologie de l'ENS (LGE) ; CNRS - INSU - École normale supérieure [ENS] - Paris, Institut des sciences de la Terre (ISTerre) ; INSU - OSUG - Université de Savoie - Université Joseph Fourier - Grenoble I - IFSTTAR - Institut de recherche pour le développement [IRD] : UR219 - CNRS, Instituto de Geofísica ; UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO, Instituto Nacional de Sismologıa, Vulcanologıa, Meterologıa e Hidrologia ; INSIVUMEH, Centro de Geosciencias ; Universidad Nacional Autónoma de México (UNAM), 6Coordinadora Nacional para la Reduccion de Desastres ; CONRED, Instituto Geografico Nacional ; IGN, Instituto Geografico y Catastro Nacional ; Centro Nacional de Registros, Laboratoire de tectonique (LT) ; CNRS - INSU - Université de Cergy Pontoise - Université Pierre et Marie Curie (UPMC) - Paris VI, Centro Universitario del Norte ; Universidad de San Carlos de Guatemala, Centro de Estudios Superiores de Energia y Minas ; Universidad de San Carlos de Guatemala, Geologia Ambiental e Economia ; Geologia Ambiental e Economia, Instituto de Geofísica (IG) ; UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO, Franco, Aurore, Lasserre, Cécile, Lyon-Caen, H., Kostoglodov, Vladimir, Molina, E., Guzman-Speziale, M., Monterosso, D., Robles, V., Figueroa, C., Amaya, W., Barrier, E., Chiquin, L., Moran, S., Flores, O., Romero, J., Santiago, J.A., Manea, M., and Manea, V.C.

Abstract

International audience, New GPS measurements in Chiapas (Mexico), Guatemala and El Salvador are used to constrain the fault kinematics in the North America (NA), Caribbean (CA) and Cocos (CO) plates triple junction area. The regional GPS velocity field is first analysed in terms of strain partitioning across the major volcano-tectonic structures, using elastic half-space modelling, then inverted through a block model. We show the dominant role of the Motagua Fault with respect to the Polochic Fault in the accommodation of the present-day deformation associated with the NA and CA relative motion. The NA/CA motion decreases from 18-22 mm yr−1 in eastern Guatemala to 14-20 mm yr−1 in central Guatemala (assuming a uniform locking depth of 14-28 km), down to a few millimetres per year in western Guatemala. As a consequence, the western tip of the CA Plate deforms internally, with ≃9 mm yr−1 of east-west extension (≃5 mm yr−1 across the Guatemala city graben alone). Up to 15 mm yr−1 of dextral motion can be accommodated across the volcanic arc in El Salvador and southeastern Guatemala. The arc seems to mark the northern boundary of an independent forearc sliver (AR), pinned to the NA plate. The inversion of the velocity field shows that a four-block (NA, CA, CO and AR) model, that combines relative block rotations with elastic deformation at the block boundaries, can account for most of the GPS observations and constrain the overall kinematics of the active structures. This regional modelling also evidences lateral variations of coupling at the CO subduction interface, with a fairly high-coupling (≃0.6) offshore Chiapas and low-coupling (≃0.25) offshore Guatemala and El Salvador.

6. Deep structural setting of the North American-Caribbean plate boundary in eastern Guatemala

Author

G. Giunta, Marco Guzmán-Speziale, Marco Menichetti, C. Zanolla, Emanuele Lodolo, Lodolo, E, Menichetti, M, Guzman-Speziale, M, Giunta, G, and Zanolla, C

Subjects
geography, education.field_of_study, geography.geographical_feature_category, Lineament, Settore GEO/03 - Geologia Strutturale, Population, Motagua transform systems, Eastern Guatemala, deep crustal structure, Polochic-Motagua transform systems, Structural basin, Sedimentary basin, Tectonics, Plate tectonics, gravity modeling, General Energy, Geophysics, Polochic, Ciencias de la Tierra, Suture (geology), Eastern Guatemala, Polochic-Motagua transform system, gravity modelling, deep crustal structure, education, Geology, Seismology, Bouguer anomaly
Abstract

Se presenta un modelo bidimensional de gravedad para determinar la estructura en profundidad del sistema de fallas lateral-izquierda de Motagua-Polochic, que son parte del límite de las placas América del Norte y del Caribe. Estos elementos tectónicos, sismicamente activos, atraviesan oeste-este la región de Guatemala y se sobreponen a una línea de sutura donde afloran cuerpos ophiolíticos. En las principales zonas de desplazamiento de las fallas se han desarrollado cuencas de pull-apart y regiones de restricción (push-up). El análisis estructural de algunas de estas fallas, situadas a lo largo del valle Izabal y del valle Motagua, en combinación con los datos obtenidos del satélite, ha permitido determinar la cinemática y el patrón de estos sistemas. La geometría y la estructura superficial del límite de las placas han sido determinadas a partir de datos geológicos y perfiles sísmicos resultantes de estudios efectuados a lo largo de una línea de 60 km de longitud al este del Lago Izabal, perpendicular al límite de placas y que interesa el valle Motagua. El Lago Izabal es la mayor cuenca de pull-apart que se ha formado a lo largo del sistema cizallante de Polochic. Los datos obtenidos con el modelo de gravedad confirman las principales características del mapa de anomalías de Bouguer de la zona y explica la mayor parte de las anomalías de amplia longitud de onda, así como aquellas de tipo local asociadas a los cuerpos geológicos de la corteza superficial y sub-superficial. La determinación de la geometría, la profundidad de las cuencas sedimentarias asociadas al sistema cizallante, así como la profundidad de los cuerpos ophiolíticos de la zona de sutura, son los principales resultados derivados de la implementación del estudio geológico y geofísico.

Published
2009
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results