La serie sísmica de Alhucemas 2016. Partición de la deformación e interacción de estructuras en un límite de placas difuso
- J.A. Álvarez-Gómez 1
- R. Martín 2
- R. Pérez-López 3
- D. Stich 2
- J.V. Cantavella 4
- J.J. Martínez-Díaz 1
- J. Morales 2
- P. Martínez García 2
- J.I. Soto 2
- E. Carreño 4
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1
Universidad Complutense de Madrid
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2
Universidad de Granada
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3
Instituto Geológico y Minero de España
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- 4 Red Sísmica Nacional, Instituto Geográfico Nacional
ISSN: 1576-5172
Année de publication: 2016
Titre de la publication: IX CONGRESO GEOLÓGICO DE ESPAÑA
Número: 16
Pages: 491-494
Type: Article
D'autres publications dans: Geotemas (Madrid)
Résumé
The mainshock of seismic series took place on January 25, 2016, with a Mw 6.3 magnitude, which was preceded by a premonitory of magnitude Mw 5.1 on 21 January. We have used 41 focal mechanisms to analyze the seismotectonics and the structural characteristics of the series. To cluster the focal mechanisms we used a hierarchical clustering algorithm using the spatial distribution of the events and also the type of rupture mechanism. For each cluster we have obtained the average focal mechanism and have been associated with a structure or family of structures. We have tested the mechanical compatibility of these structures by Coulomb stress transfer modelling. The mainshock of the series occurred in the Al Idrisi Fault intersecting the Alboran Ridge. This event triggered aftershocks and independent series in strike-slip faults associated with the Al Idrisi Fault System towards the south, but also in reverse faults associated with the lifting of the Alboran Ridge eastward; producing a strain partitioning between both types of structures interacting by stress transfer.