“…It is associated with several significant historical earthquakes (Cabral et al, 2013(Cabral et al, , 2004Carvalho et al, 2008;Custódio et al, 2015), from which a major tectonic fault is deduced, the LTV fault system in Fig.2b. The sediment thickness can reach several km's (Carvalho et al, 2016), making difficult a proper study of the crustal structure. To the NW the LTV is bounded by the uplifted Mesozoic Estremadura region, whereas to NE and SE is bounded by the CIZ and OMZ.…”