Publication: La serie sísmica de Alhucemas 2016. Partición de la deformación e interacción de estructuras en un límite de placas difuso
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Publication Date
2016
Authors
Martin, R.
Pérez López, Raúl
Stich, Daniel
Cantavella, Juan V.
Martínez Díaz, José J.
Morales, J.
Martínez García, P.
Soto, Juan I.
Carreño, E.
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Sociedad Geológica de España.
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Abstract
El terremoto principal de la serie sísmica tuvo lugar el 25 de enero de 2016, con una magitud Mw 6.3, que fue precedido por un premonitorio de magnitud Mw 5.1 el día 21 de enero. Hemos utilizado 41 mecanismos focales para analizar las características sismotectónicas y estructurales de la serie. Para agrupar los mecanismo focales hemos utilizado un algoritmo de agrupamiento jerárquico espacial y por el tipo de rotura del mecanismo. De cada agrupación hemos obtenido el mecanismo focal medio y lo hemos asociado a una estructura o familia de estructuras. Hemos comprobado la compatibilidad mecánica de estas estructuras mediante transferencia de esfuerzos de Coulomb. El evento principal de la serie se produjo en la Falla de Al Idrisi intersectando la cresta de Alborán. Este evento disparó réplicas y series independientes en fallas de desgarre asociadas al sistema de Falla de Al Idrisi hacia el sur, pero también en fallas inversas asociadas al levantamiento de la Cresta de Alborán hacia el este; produciendose una partición de la deformación entre ambos tipos de estructuras interaccionando por transferencia de esfuerzos.
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.
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.