1. Laboratoire de Géophysique Interne et Tectonophysique; Observatoire de Grenoble, Université Joseph Fourier; Grenoble France
2. Laboratoire de Physique de la Matière Condensée; CNRS UMR 6622 and Université de Nice-Sophia Antipolis; Nice France
3. Department of Earth and Space Sciences; University of California; Los Angeles California USA
4. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
5. U. F. R. de Sciences Economiques, Gestion, Mathématiques et Informatique; CNRS UMR7536 and Université Paris X-Nanterre; Nanterre France
6. International Institute of Earthquake Prediction Theory and Mathematical Geophysics; Russian Academy of Science; Moscow Russia