1. Faculty of Physical and Mathematical Sciences, National Seismological Center, University of Chile, Blanco Encalada 2002, Santiago, Chile, fbravo@csn.uchile.cl, pkoch@csn.uchile.cl, sebastian@csn.uchile.cl
2. Geophysics Department, Faculty of Physical and Mathematical Sciences, University of Chile, Blanco Encalada 2002, Santiago, Chile, mauricio@dgf.uchile.cl, jaime@dgf.uchile.cl