Earthquake crisis unveils the growth of an incipient continental fault system

Gracia, Eulalia, Grevemeyer, Ingo, Bartolome, Rafael, Perea, Hector, Martínez-Loriente, Sara, Gomez de la Pena, Laura, Villasenor, Antonio, Klinger, Yann, Lo Iacono, Claudio, Diez, Susana, Calahorrano, Alcinoe, Camafort, Miquel, Costa, Sergio, d’Acremont, Elia, Rabaute, Alain and Ranero, Cesar R. (2019) Earthquake crisis unveils the growth of an incipient continental fault system Nature Communications, 10 (Article number 3482). DOI 10.1038/s41467-019-11064-5.

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Abstract

Large continental faults extend for thousands of kilometres to form boundaries between rigid tectonic blocks. These faults are associated with prominent topographic features and can produce large earthquakes. Here we show the first evidence of a major tectonic structure in its initial-stage, the Al-Idrissi Fault System (AIFS), in the Alboran Sea. Combining bathymetric and seismic reflection data, together with seismological analyses of the 2016 Mw 6.4 earthquake offshore Morocco – the largest event ever recorded in the area – we unveil a 3D geometry for the AIFS. We report evidence of left-lateral strike-slip displacement, characterise the fault segmentation and demonstrate that AIFS is the source of the 2016 events. The occurrence of the Mw 6.4 earthquake together with historical and instrumental events supports that the AIFS is currently growing through propagation and linkage of its segments. Thus, the AIFS provides a unique model of the inception and growth of a young plate boundary fault system.

Document Type: Article
Keywords: Seismic hazards, earthquakes, Western Mediterranean, seafloor mapping
Research affiliation: Scripps
NOC
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1038/s41467-019-11064-5
ISSN: 2041-1723
Projects: Eurofleets, LabexMER, TOPO-EUROPE
Date Deposited: 20 Sep 2019 08:30
Last Modified: 23 Sep 2019 17:18
URI: http://eprints.uni-kiel.de/id/eprint/47791

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