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The ALERT-ES Project: an Earthquake Early Warning System for S. Iberia
Buforn, E.; Carranza, M.; Udías, A.; Goula, X.; Colom, Y.; Roca, A.; Zollo, A.; Lozano, L.; Pro, C.; Carrilho, F.; Hanka, W.; Madariaga, R.The main goal of the ALERT-ES project (“Sistema de Alerta Sísmica Temprana: Aplicación al Sur de España”) is to study the feasibility of an Earthquake Early Warning System (EEWS) for SW Iberian Peninsula applied to the potentially damaging earthquakes that occur in the region of Cape S. Vicente-Gulf of Cadiz. This area is characterized by the occurrence of large earthquakes with damage in SW Iberia, such as tho...
Mechanism of 2003, 2007 and 2009 earthquakes (S. Vicente Cape) and implications...
Buforn, E.; Pro, C.; Bezzeghoud, M.; Udias, A.The San Vicente Cape region (SW Iberia) is of great seismological interest due to its tectonic complexity and for the occurrence of the 1755 Lisbon mega-earthquake. A structure capable of generating such large earthquake has not been convincingly found but authors agree with the possible occurrence in the future of a similar earthquake offshore of San Vicente Cape.We have studied the mechanism of three earthqua...
Seismicity along the western part of the Eurasia-Nubian plate boundary
Bezzeghoud, M.; Adam, C.; Buforn, E.; Borges, J.F.; Caldeira, B.The seismicity along the western part of the Eurasia-Nubian plate boundary is characterized by a very complex pattern. In average, the motion is transtensional in the Azores, dextral along the Gloria transform zone and convergent between the SW Portuguese Atlantic margin and the Ibero-Maghrebian zone. To constraint the factors controlling the seismicity, we provide a new seismotectonic synthesis using several s...
The ALERT-ES Project for earthquakes in Cape San Vicente region
Buforn, E.; Mattesini, M.; Martín Dávila, J.; Goula, X.; Colom, Y.; Zollo, Z.; Udías, A.; Pazos, A.; Roca, A.; Lozano, L.; Carrilho, F.; Hanka, W.The main goal of the ALERT-ES project ("Sistema de Alerta Sismica Temprana: Aplicacion al Sur de España" ) is to study the feasibility of an Earthquake Early Warning System (EEWS) for the potentially damaging earthquakes that occur in the zone Cape S. Vicente-Gulf of Cadiz (S. Spain). This area is characterized by the occurrence of large and damaging earthquakes such as the 1755 Lisbon (Imax=X) or 1969 S. Vicen...
The Gulf of Cádiz: thrusting or strike-slip motion?
Bezzeghoud, M.; Buforn, E.; Caldeira, B.; Pro, M.C.; Borges, J.F.; Udías, A.In the Gulf of Cádiz (SW Iberian Peninsula) the boundary between Eurasia and Nubia plates corresponds to a narrow band well defined by the seismicity, where large earthquakes (M>7.0) may be associated to N-S to NNW-SSE horizontal compression due to the convergence between the two plates. Most of these earthquakes are at shallow depth (less than 40 km), with some foci at intermediate-depth, showing E-W distribut...
Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region
Buforn, E.; Cesca, S.; Bezzeghoud, M.; del Fresno, C.; Udias, A.The Ibero-Magrhebian region is located at the plate boundary between Eurasia and Africa and it is a tectonically complex region. A sign of the complexity, is the occurrence of intermediate depth earthquakes (40<h<150 km), located in south Spain, between Granada- Malaga and at the west part of Alboran Sea, together with the occurrence of very deep earthquakes (h≈650 km) near Dúrcal (Granada). Intermediate depth ...
Seismicity along the Azores-Gibraltar region controlled by global plates’kinema...
Adam, C; Bezzghoud, M; Buforn, E; borges, JF; Caldeira, BThe seismicity along the western part of the Eurasia-Nubian plate boundary has been widely studied and is charac- terized by a very complex pattern. The movement is transtensional in the Azores, dextral along the Gloria transform and convergent between the SW Atlantic margin and the Ibero-Maghrebian zone. In order to understand geograph- ical evolution of the seismicity pattern along this plate frontier, we com...
The 2007 Azores earthquakes: A case of triggering?
Buforn, E; Bezzghoud, M; Borges, JF; Caldeira, BOn 5 April (Mw=6.3) and 7 April 2007 (Mw=6.1 ) two earthquakes occur at the Formigas Islets (Azores Islands), both with same epicenter and felt (I=V/VI MSK) in S. Miguel Island. The rupture process of these earthquakes has been studied from body wave inversion of broad band data at telesesimic distances. Results obtained shown normal faulting for both shocks, with planes oriented in NW–SE direction, with focus ...
Sismicidade e sismotectónica dos Açores: implicações geodinâmicas
Borges, J.F.; Caldeira, B.; Bezzeghoud, M.; Buforn, E.In the last third six years various research works have been produced to study the earthquake mecha- nism of events M equal or greater than 6, in order to characterize the geodynamic complexity. In this work we summarize these studies and present their main conclusions. The analysis of focal mechanisms indicates evidences of two zones with different pat- terns of movement and rates of deformation. In zone I, be...
Seismic activity in the Azores Region in the contexto of the western part of th...
Bezzeghoud, M.; Borges, J.F.; Caldeira, B.; Buforn, E.; Udias, A.The western part of the Eurasia-Nubia plate boundary, with different tectonic features, extends from the Azores Islands to the Strait of Gibraltar. Based on focal mechanisms of large earthquakes, we observe the conversion of an extensional regime (Strike-slip and normal dip-slip motion) near to the Azores to a compressional regime (strike-slip and reverse dip-slip motion) in the east of the Atlantic Ocean (Gulf...
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