1. Berkeley Seismological Laboratory, University of California, Berkeley, California, U.S.A.
2. Institute of Geophysics, Czech Academy of Science, Czech Republic
3. School of Earth and Space Sciences, Peking University, Beijing, China
4. Hebei Hongshan Geophysical National Observation and Research Station, Peking University, Beijing, China
5. Institute of Earth Sciences, Academia Sinica, Taipei City, Taiwan