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Source parameters of the 1992 Melilla (Spain, M_W = 4.8), 1994 Alhoceima (Morocco, M_W = 5.8), and 1994 Mascara (Algeria, M_W = 5.7) earthquakes and seismotectonic implications

Dpto de Fisica, Apartado 94Universidade de Evora, 7001 Evora, Portugal
Dpto de Geofísica Facultad CC. Físicas Universidad Complutense, 28040 Madrid, Spain

Abstract

Source mechanisms of the Melilla, Alhoceima, and Mascara earthquakes, including fault-plane solutions, waveform modeling, and spectral analysis, are presented. Strike-slip solutions have been obtained for the Melilla and Alhoceima earthquakes and reverse faulting for Mascara. Teleseismic P-wave inversion, using broadband data, show a complex mechanism for the Alhoceima earthquake formed by two subevents at very shallow depth (7 and 8 km) and scalar seismic moments of 1.1 x 10e + 17 N-m and 4.8 x 10e + 17 N-m. The Mascara earthquake was a single event, with a shallow depth (4.5 km) and a scalar seismic moment of 3.3 x 10e + 17 N-m. Results of the Alhoceima, Melilla, and Mascara earthquakes, together with 53 focal mechanisms in the region, show a regional stress regime that corresponds to horizontal compression in a NW-SE direction, associated with the convergence between Eurasia and Africa. A change of the stress regime in the plate boundary of the Ibero-Maghrebian region has been found.

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