1. Université Nice Sophia Antipolis, Géoazur (UMR7329), CNRS; Observatoire de la Côte d'Azur; Sophia-Antipolis France
2. Now at Lamont-Doherty Earth Observatory; Columbia University; New York New York USA
3. Seismological Laboratory; California Institute of Technology; Pasadena California USA
4. Institut Universitaire de France; Paris France
5. Institut de Physique du Globe de Paris, Sorbonne Paris Cité; Paris VII-Denis Diderot University, CNRS; Paris France