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Relationships between inherited crustal structures and seismicity in the Western Alps inferred from 3D structural modeling

Christian Sue, Philippe Calcagno, Gabriel Courrioux, Pierre Tricart, Julien Frechet and Francois Thouvenot
Relationships between inherited crustal structures and seismicity in the Western Alps inferred from 3D structural modeling (in Geodynamics of the France Southeast Basin; importance of gravity tectonics, Xavier Le Pichon (editor) and Claude Rangin (editor))
Bulletin de la Societe Geologique de France (November 2010) 181 (6): 583-590

Abstract

We developed a 3-D structural model of a key area in the southwestern Alps, at the boundary between the external and internal zones. Six geological bodies are analyzed: internal and external basements, Brianconnais and Piemontais zones (internal sedimentary cover nappes), exotic flyschs, and external sedimentary cover. 3D volumes of each geological body are modeled using the structural map of the area projected on the Digital Elevation Model (DEM) and 5 cross-sections. The global model is interpolated from the map, DEM, and cross sections, using the potential field method, and represented by a Voronoi diagram. The final 3D-model is used as a structural frame to plot the earthquakes of the GeoFrance3D database, allowing to precisely and quantitatively investigate the relationships between crustal structures and current seismic activity of the belt. The boundary between external and internal zones corresponds to the so-called Crustal Penninic Thrust (CPT), which is a former Oligocene major thrust. Our model establishes that this former thrust represents the western limit of the seismic activity along the Brianconnais seismic arc, currently undergoing extensional tectonics.


ISSN: 0037-9409
EISSN: 1777-5817
Coden: BSGFAE
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 181
Serial Issue: 6
Title: Relationships between inherited crustal structures and seismicity in the Western Alps inferred from 3D structural modeling
Title: Geodynamics of the France Southeast Basin; importance of gravity tectonics
Author(s): Sue, ChristianCalcagno, PhilippeCourrioux, GabrielTricart, PierreFrechet, JulienThouvenot, Francois
Author(s): Le Pichon, Xaviereditor
Author(s): Rangin, Claudeeditor
Affiliation: Universite Brest Occidentale, Plouzane, France
Affiliation: College de France, Aix en provence, France
Pages: 583-590
Published: 201011
Text Language: English
Summary Language: French
Publisher: Societe Geologique de France, Paris, France
References: 46
Accession Number: 2011-012778
Categories: Structural geologySeismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N44°30'00" - N45°00'00", E06°00'00" - E07°00'00"
Secondary Affiliation: Bureau de Recherches Geologique et Minieres, FRA, FranceLaboratoire de Geodynamique des Chaines Alpines, FRA, FranceInstitut de Physique du Globe de Strasbourg, FRA, FranceLaboratoire de Geophysique Interne et Tectonophysique, FRA, France
Country of Publication: France
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Societe Geologique de France. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201108
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