Abstract
The goal of this work is to identify seismogenic nodes capable of generating I0 ≥ VI earthquakes in the French Massif Central, an intraplate region of low-to-moderate seismicity in the Mediterranean. For this purpose, we apply a phenomenological approach based on the pattern recognition. Recognition objects—morphostructural nodes—have been delineated with the morphostructural zoning method enabling to outline the hierarchical block-structure of the region, the network of morphostructural lineaments bounding blocks, and the loci of the nodes that are formed at the intersections of the lineaments. The epicenters of I0 ≥ VI earthquakes nucleate at some of the delineated nodes. The CORA-3 recognition algorithm pinpointed the other capable nodes, where the target earthquakes have not yet been recorded. The recognized seismogenic nodes are situated mainly in the eastern part of the Massif and correlate with high ranks lineaments dividing the larger blocks of the Massif Central. An assemblage of geomorphic features typical of seismogenic nodes was also defined. The work provides information on the potential earthquake sources which is very important for knowledgeable long-term seismic hazard assessment.
Resumen
El objetivo de este trabajo es la identificación de nodos sismogenéticos capaces de generar terremotos de Intensidad I0 > VI en el Macizo Central Francés, una región intraplaca de sismicidad moderada a baja, situada en el ámbito mediterráneo. Con este propósito aplicamos una aproximación fenomenológica basada en el reconocimiento de patrones. Los objetos a reconocer –nodos morfo-estructurales– han sido delineados con el método de zonificación estructural que ha permitido delinear la estructura jerárquica de bloques de la región, la red de lineamientos morfo-estructurales que limitan esos bloques y la localización de los nodos formados por la intersección de los lineamientos. Los epicentros de los terremotos de I0 > VI se nuclean en algunos de los nodos delineados. El algoritmo de reconocimiento CORA-3 situó los otros nodos capaces, en los que los terremotos buscados no se han registrado aun. Los nodos sismogénicos reconocidos se sitúan principalmente en el sector oriental del Macizo y se correlacionan con lineamientos de alto rango. Este trabajo aporta información acerca de potenciales fuentes de terremotos que es muy importante para las estimaciones de peligrosidad sísmica a largo plazo.
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Acknowledgements
A.Gorshkov was partly funded by Russian Foundation of Basic Research (RFBR) according to the research Projects No. 16-55-12033.
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Gorshkov, A., Gaudemer, Y. Seismogenic nodes defined with pattern recognition in the French Massif Central. J Iber Geol 45, 63–72 (2019). https://doi.org/10.1007/s41513-018-0087-x
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DOI: https://doi.org/10.1007/s41513-018-0087-x