Review article: Deterministic seismic hazard assessment of the area comprised between west Gulf of Cádiz and east Alboran Sea

Abstract

Abstract. The convergence zone of the NE-SW complex comprising the Gulf of Cádiz and the Alboran Sea, at the Eurasian-Nubian plate boundary, is frequently affected by seismic activity, caused by submarine long-strike strike-slip fault systems and arcuate fold-thrust systems found in the region. This has resulted in moderate to high magnitude earthquakes, including tsunamigenic earthquakes, and the area has also experienced tsunamis due to major earthquakes and gravitational landslides. This study carries out a Seismic Hazard Analysis, for bedrock conditions, of the marine area between the W of the Gulf of Cádiz and the E of the Alboran Sea in the Ibero-Maghrebian region, based on a deterministic approach, considering areal seismogenic sources. For the estimation of the seismic hazard, a Visual Basic script based on Excel has been used, which has been improved. The results obtained show that the most probable Peak Ground Acceleration (PGA) ranges from 0.2 to 0.4 g, although it can reach up to 1.0 g in certain areas. These results highlight the need for a detailed study of the distribution of seismic hazard in submarine areas, given the significant values of accelerations that can occur. This work is the first comprehensive deterministic seismic hazard assessment carried out in the Ibero-Maghrebian region and aims to take a first step to promote seismic hazard studies in marine areas, whose results can provide relevant information given the implications of earthquakes in the genesis of other natural hazards such as tsunamis and submarine landslides.

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