Agustin Udias is Emeritus Professor at the Universidad Complutense de Madrid (UCM). He is the author of many papers about seismicity, seismotectonics of the Azores-Gibraltar, and the physics of seismic sources, and has also written several textbooks including Principles of Seismology (Cambridge University Press, 1999). Professor Udias has served as Editor-in-Chief of Fisica de la Tierra and the Journal of Seismology, and earlier as the Vice-President of the European Seismological Commission. He is a member of the Accademia Europeae, the Seismological Society of America, the American Geophysica...