1. Department of Earth and Planetary Sciences; University of California; Santa Cruz CA USA
2. Now at Department of Geology; University of Otago; Dunedin New Zealand
3. Earthquake Research Institute; University of Tokyo; Tokyo Japan
4. GNS Science; Lower Hutt New Zealand
5. University of Texas Institute for Geophysics (UTIG); Austin TX USA
6. Cooperative Institute for Research in Environmental Sciences; University of Colorado Boulder; Boulder CO USA
7. Lamont-Doherty Earth Observatory (LDEO); Columbia University; New York NY USA
8. Disaster Prevention Research Institute; Kyoto University; Kyoto Japan