Francisco H Ortega Culaciati, University of Chile, FCFM - Department of Geophysics, Santiago, Chile, Mark Simons, Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States, Luis A Rivera, Institut de Physique du Globe de Strasbourg, UMR 7516, Université de Strasbourg/EOST, CNRS, Strasbourg, France and Javier A Ruiz, Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile