Acknowledgements

The authors acknowledge Fundação para a Ciência e Tecnologia through the multi-annual grants of the research units Centro de Geofísica de Évora (Universidade de Évora) and LATTEX (Faculdade de Ciências da Universidade de Lisboa) - Geodyn – Present to Past POCTI-ISFL-5-32. Comments and suggestions by Prof. Rui Dias and Prof. Carlos Coke (referees of this article), were much appreciated.