1. GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany, camcat@stanford.edu
2. Now at Department of Geophysics, Stanford University, Stanford, California, U.S.A.
3. School of Earth Sciences & Cabot Institute, University of Bristol, Bristol BS81RL, United Kingdom
4. Instituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, Rome, Italy
5. GNS Science, 1 Fairway Drive, Lower Hutt, New Zealand
6. Southern California Earthquake Center, University of Southern California, 3651 Trousdale Parkway, Los Angeles, California U.S.A.
7. Now at Jet Propulsion Laboratory, Pasadena, California, U.S.A.
8. University of Grenoble, ISTerre, CNRS, 25 Avenue des Martyrs, Grenoble, France
9. Departamento de Computación e Inteligencia Artificial, Universidad de Granada, Avenue del Hospicio, Granada, Spain
10. University of Adelaide, Adelaide, South Australia, Australia