Actualización del catálogo de tensores momentos del IAG para la región IberoMagrebí (2009-2013)

Resumen

We present the IAG moment tensor catalogue update with 85 new solutions of events occurred in the IberianMaghreb region during the IberArray deployment. We use the established inversion procedure increasing up to 310 solutions the catalogue. New solutions present magnitudes ranging from Mw 3.2 to 6.3 and source depths from 2 to 620 km. Most solutions correspond to northern Algeria, where a compressive deformation pattern is consolidated. The Betic-Rif sector shows a progression of faulting styles from mainly shear faulting in the east via predominantly extension in the centre to reverse and strike-slip faulting in the west. At the SW Iberia margin, the predominance of strike-slip and reverse faulting agrees with the expected transpressive character of the Eurasian-Nubia plate boundary. New strike-slip and oblique reverse solutions in the Trans-Alboran Shear Zone reflect its left-lateral regime. In the Atlas System, new reverse and strike-slip faulting solutions display the accommodation of plate convergence by shortening in the belt. At the Gibraltar Arc, new solutions obtained at lower crustal and subcrustal depths show substantial heterogeneity suggesting conjunction of processes: plate convergence in old oceanic lithospheric with large brittle thickness at the SW Iberia margin, as well as delamination of thickened continental lithosphere beneath the Betic-Rif arc.