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Agustín Udías - One of the best experts on this subject based on the ideXlab platform.

  • Seismotectonics of the Ibero-Maghrebian region
    Tectonophysics, 1995
    Co-Authors: Elisa Buforn, C. Sanz De Galdeano, Agustín Udías
    Abstract:

    Abstract A study of the Seismotectonics of the Ibero-Maghrebian region is presented as deduced from main geological features, seismicity and focal mechanism data. The hypocentral distribution of shallow, intermediate-depth and deep earthquakes is analyzed. The direction of the stress distribution is inferred from the focal mechanism of 24 selected events. A seismotectonic framework summarizing these results together with the main geological features shows that a NW-SE general direction of horizontal compressive stresses is present in the region with a localized zone of horizontal tensions in the Betics and the Alboran Sea. The presence of intermediate-depth and deep earthquakes is tentatively explained as caused by two consecutive processes of subduction.

  • Seismotectonics of the Ibero-Maghrebian region
    Tectonophysics, 1995
    Co-Authors: Elisa Buforn, C. Sanz De Galdeano, Agustín Udías
    Abstract:

    15 páginas, 8 figuras, 2 tablas.A study of the Seismotectonics of the Ibero-Maghrebian region is presented as deduced from main geological features, seismicity and focal mechanism data. The hypocentral distribution of shallow, intermediate-depth and deep earthquakes is analyzed. The direction of the stress distribution is inferred from the focal mechanism of 24 selected events. A seismotectonic framework summarizing these results together with the main geological features shows that a NW-SE general direction of horizontal compressive stresses is present in the region with a localized zone of horizontal tensions in the Betics and the Alboran Sea. The presence of intermediate-depth and deep earthquakes is tentatively explained as caused by two consecutive processes of subduction.This work has been supported in part\ud by the Dirección General de Investigación Cientifica\ud y Tecnológica, Project PB92-0184, by the Grupo de\ud Trabajo 4085 (Análisis y Dinámica de Cuencas) of\ud the Junta de Andalucia and by the European Economic\ud Community, CT91-0042. Publication 339,\ud Department of Geophysics, Universidad Complutense\ud de Madrid.Peer reviewe

  • Seismotectonics of the Canary Islands
    Tectonophysics, 1992
    Co-Authors: J. Mezcua, Elisa Buforn, Agustín Udías, J. Rueda
    Abstract:

    Abstract A revision of the seismicity, both historical and instrumental for the Canary Islands is presented. The occurrence on May 9, 1989 of an earthquake of magnitude 5.2 between the islands Gran Canaria and Tenerife, followed by a large number of aftershocks have been interpreted on seismotectonic grounds. The main conclusion is that a horizontal compressional stress regime in NW-SE direction is present in the region which is compatible with the tectonics in the northwestern part of the African continent.

Elisa Buforn - One of the best experts on this subject based on the ideXlab platform.

  • Seismotectonics of the Ibero-Maghrebian region
    Tectonophysics, 1995
    Co-Authors: Elisa Buforn, C. Sanz De Galdeano, Agustín Udías
    Abstract:

    Abstract A study of the Seismotectonics of the Ibero-Maghrebian region is presented as deduced from main geological features, seismicity and focal mechanism data. The hypocentral distribution of shallow, intermediate-depth and deep earthquakes is analyzed. The direction of the stress distribution is inferred from the focal mechanism of 24 selected events. A seismotectonic framework summarizing these results together with the main geological features shows that a NW-SE general direction of horizontal compressive stresses is present in the region with a localized zone of horizontal tensions in the Betics and the Alboran Sea. The presence of intermediate-depth and deep earthquakes is tentatively explained as caused by two consecutive processes of subduction.

  • Seismotectonics of the Ibero-Maghrebian region
    Tectonophysics, 1995
    Co-Authors: Elisa Buforn, C. Sanz De Galdeano, Agustín Udías
    Abstract:

    15 páginas, 8 figuras, 2 tablas.A study of the Seismotectonics of the Ibero-Maghrebian region is presented as deduced from main geological features, seismicity and focal mechanism data. The hypocentral distribution of shallow, intermediate-depth and deep earthquakes is analyzed. The direction of the stress distribution is inferred from the focal mechanism of 24 selected events. A seismotectonic framework summarizing these results together with the main geological features shows that a NW-SE general direction of horizontal compressive stresses is present in the region with a localized zone of horizontal tensions in the Betics and the Alboran Sea. The presence of intermediate-depth and deep earthquakes is tentatively explained as caused by two consecutive processes of subduction.This work has been supported in part\ud by the Dirección General de Investigación Cientifica\ud y Tecnológica, Project PB92-0184, by the Grupo de\ud Trabajo 4085 (Análisis y Dinámica de Cuencas) of\ud the Junta de Andalucia and by the European Economic\ud Community, CT91-0042. Publication 339,\ud Department of Geophysics, Universidad Complutense\ud de Madrid.Peer reviewe

  • Seismotectonics of the Canary Islands
    Tectonophysics, 1992
    Co-Authors: J. Mezcua, Elisa Buforn, Agustín Udías, J. Rueda
    Abstract:

    Abstract A revision of the seismicity, both historical and instrumental for the Canary Islands is presented. The occurrence on May 9, 1989 of an earthquake of magnitude 5.2 between the islands Gran Canaria and Tenerife, followed by a large number of aftershocks have been interpreted on seismotectonic grounds. The main conclusion is that a horizontal compressional stress regime in NW-SE direction is present in the region which is compatible with the tectonics in the northwestern part of the African continent.

Sierd Cloetingh - One of the best experts on this subject based on the ideXlab platform.

  • Insights from scaled analogue modelling into the Seismotectonics of the Iranian region
    Tectonophysics, 2003
    Co-Authors: Marco Bonini, Giacomo Corti, Dimitrios Sokoutis, Gianfranco Vannucci, Paolo Gasperini, Sierd Cloetingh
    Abstract:

    Abstract We show how analogue modelling provides insights into complex crustal block kinematics and the Seismotectonics of active areas undergoing contraction, such as the Iranian region. The seismotectonic model deriving from this analysis is consistent with partitioning of the N-directed Arabia indentation into a composite system of collision-oblique and collision-parallel seismogenetic belts. These features include (1) two main conjugate transpressive belts (the dextral NW–SE-trending Zagros belt and the NE–SW-trending sinistral Elburz-Aran-Torud (EAT) belt), and (2) a modest lateral escape of Central Iran towards the Lut block along the Nayband belt. This cinematic model fits the seismic activity and the current fault pattern of the region. Also, the velocity field scaled from the model to nature shows a good similarity with previous numerical modelling as well as with deformation rates along the first-order seismogenetic belts determined by plate tectonic models and GPS data.

  • Insights from scaled analogue modelling into the Seismotectonics of the Iranian region
    Tectonophysics, 2003
    Co-Authors: Marco Bonini, Giacomo Corti, Dimitrios Sokoutis, Gianfranco Vannucci, Paolo Gasperini, Sierd Cloetingh
    Abstract:

    We show how analogue modelling provides insights into complex crustal block kinematics and the Seismotectonics of active areas undergoing contraction, such as the Iranian region. The seismotectonic model deriving from this analysis is consistent with partitioning of the N-directed Arabia indentation into a composite system of collision-oblique and collision-parallel seismogenetic belts. These features include (1) two main conjugate transpressive belts (the dextral NW-SE-trending Zagros belt and the NE-SW-trending sinistral Elburz-Aran-Torud (EAT) belt), and (2) a modest lateral escape of Central Iran towards the Lut block along the Nayband belt. This cinematic model fits the seismic activity and the current fault pattern of the region. Also, the velocity field scaled from the model to nature shows a good similarity with previous numerical modelling as well as with deformation rates along the first-order seismogenetic belts determined by plate tectonic models and GPS data. © 2003 Elsevier B.V. All rights reserved

Marco Bonini - One of the best experts on this subject based on the ideXlab platform.

  • Insights from scaled analogue modelling into the Seismotectonics of the Iranian region
    Tectonophysics, 2003
    Co-Authors: Marco Bonini, Giacomo Corti, Dimitrios Sokoutis, Gianfranco Vannucci, Paolo Gasperini, Sierd Cloetingh
    Abstract:

    Abstract We show how analogue modelling provides insights into complex crustal block kinematics and the Seismotectonics of active areas undergoing contraction, such as the Iranian region. The seismotectonic model deriving from this analysis is consistent with partitioning of the N-directed Arabia indentation into a composite system of collision-oblique and collision-parallel seismogenetic belts. These features include (1) two main conjugate transpressive belts (the dextral NW–SE-trending Zagros belt and the NE–SW-trending sinistral Elburz-Aran-Torud (EAT) belt), and (2) a modest lateral escape of Central Iran towards the Lut block along the Nayband belt. This cinematic model fits the seismic activity and the current fault pattern of the region. Also, the velocity field scaled from the model to nature shows a good similarity with previous numerical modelling as well as with deformation rates along the first-order seismogenetic belts determined by plate tectonic models and GPS data.

  • Insights from scaled analogue modelling into the Seismotectonics of the Iranian region
    Tectonophysics, 2003
    Co-Authors: Marco Bonini, Giacomo Corti, Dimitrios Sokoutis, Gianfranco Vannucci, Paolo Gasperini, Sierd Cloetingh
    Abstract:

    We show how analogue modelling provides insights into complex crustal block kinematics and the Seismotectonics of active areas undergoing contraction, such as the Iranian region. The seismotectonic model deriving from this analysis is consistent with partitioning of the N-directed Arabia indentation into a composite system of collision-oblique and collision-parallel seismogenetic belts. These features include (1) two main conjugate transpressive belts (the dextral NW-SE-trending Zagros belt and the NE-SW-trending sinistral Elburz-Aran-Torud (EAT) belt), and (2) a modest lateral escape of Central Iran towards the Lut block along the Nayband belt. This cinematic model fits the seismic activity and the current fault pattern of the region. Also, the velocity field scaled from the model to nature shows a good similarity with previous numerical modelling as well as with deformation rates along the first-order seismogenetic belts determined by plate tectonic models and GPS data. © 2003 Elsevier B.V. All rights reserved

Raymond Durrheim - One of the best experts on this subject based on the ideXlab platform.

  • First-order regional seismotectonic model for South Africa
    Natural Hazards, 2011
    Co-Authors: Mayshree Singh, Andrzej Kijko, Raymond Durrheim
    Abstract:

    A first-order seismotectonic model was created for South Africa. This was done using four logical steps: geoscientific data collection, characterisation, assimilation and zonation. Through the definition of subunits of concentrations of earthquake foci and large neotectonic and structural domains, seismotectonic structures, systems and domains were created. Relatively larger controls of seismicity exist between the Great Escarpment and the coast. In the south, this region is characterised by large aeromagnetic anomalies and large EW trending faults. In the west, it is characterised by the NW–SE trending Wegener stress anomaly, radial-trending dykes and earthquake clusters. In the east, it is characterised by a large neotectonic domain where several large historical earthquakes occurred. In the centre of South Africa, several clusters of earthquake activity are found, often related to mining activity. Further north, seismicity is related to both mining activity and neotectonic deformation. This work contributes to the development of a seismotectonic model for South Africa by (1) bringing together, digitally, several data sets in a common GIS platform (geology, geophysics, stress, seismicity, neotectonics, topography, crustal and mantle structure and anisotropy), (2) understanding the significance of data sets for seismotectonic zonation and limitations thereof and (3) obtaining a reasonable regional model for use in seismic hazard assessments.

  • Seismotectonic Models for South Africa: Synthesis of Geoscientific Information, Problems, and the Way Forward
    Seismological Research Letters, 2009
    Co-Authors: Mayshree Singh, Andrzej Kijko, Raymond Durrheim
    Abstract:

    should be reviewed; surface and subsurface investigations of the orientation, geometry, sense of displacement, and length of ruptures should be conducted; and the possibility of multiple ruptures ought to be assessed. Seismotectonic models have not yet been developed for South Africa. The delineation of seismotectonic zones of Africa as part of the Global Seismic Hazard Assessment Program (GSHAP) in 1999 was based on an analysis of the main tectonic structures and a correlation with present-day seismicity. Because of the large scale of the GSHAP project, only regional structures were accounted for in the preparation of the source zones. Our study was initiated to remedy this knowledge gap. We have completed four steps, which are described in this paper. Compilation of a catalog of earthquake activity that has