1. Department of Computational Mathematics, Science and Engineering, Michigan State University, East Lansing, Michigan, U.S.A.
2. Department of Earth and Environmental Sciences, Michigan State University, East Lansing, Michigan, U.S.A.
3. Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah, U.S.A.
4. Earth, Planetary and Space Sciences, University of California Los Angeles, Los Angeles, California, U.S.A.
5. Lanzhou Institute of Geotechnique and Earthquake, China Earthquake Administration, Lanzhou, Gansu, China