Mainland Portugal, located in the vicinity of the Azores-Gibraltar plate boundary, is exposed to large magnitude (M 8.0–8.5) distant interplate earthquakes and moderate magnitude (M 7.0) local intraplate earthquakes. Such events, although infrequent, are relevant in terms of seismic hazard assessment and risk management, in particular in the Lisbon metropolitan area and the Algarve region (Vilanova and Fonseca 2007). The Azores archipelago, located at the North America, Eurasia, and Africa triple junction, is the source location of frequent low-magnitude events and seismic swarms and occasional moderate (M 7.0) magnitude earthquakes. Figure 2(C) shows the general...
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