1. Civil Design, Generation Engineering, BC Hydro, 6911 Southpoint Drive, Edmonds A02, Burnaby, British Columbia, Canada V3N 4X8, Behzad.hassani@bchydro.com
2. Department of the Interior, U.S. Geological Survey, Earthquake Science Center, 525 South Wilson Avenue, Pasadena, California 91106 U.S.A., yong@usgs.gov
3. Department of Earth Sciences, Western University, 1151 Richmond Street, London, Ontario, Canada N6A 5B7, gmatkinson@aol.com
4. Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles E Young Drive East, Los Angeles, California 90024 U.S.A., tianfengseis@ucla.edu, meng@epss.ucla.edu