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.

Preview	Text s41467-019-11064-5.pdf - Published Version Available under License Creative Commons: Attribution 4.0. Download (8MB) | Preview
Preview	Text 41467_2019_11064_MOESM1_ESM.pdf - Supplemental Material Available under License Creative Commons: Attribution 4.0. Download (1MB) | Preview

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.

Actions (login required)

View Item