1. a Department of Earth, Atmospheric, and Planetary Sciences , Massachusetts Institute of Technology , Cambridge, Massachusetts, 02139
2. b Large Lakes Observatory , University of Minnesota , Duluth, Minnesota, 55812
3. c State Seismological Bureau , Institute of Geology , Beijing, China
4. d Provincial Bureau of Seismology , State Seismological Bureau , Urumqi, Xinjiang, China
5. e Department of Earth, Atmospheric, and Planetary Sciences , Massachusetts Institute of Technology , Cambridge, Massachusetts, 02139
6. f Provincial Bureau of Seismology , State Seismological Bureau , Urumqi, Xinjiang, China
7. g State Seismological Bureau , Institute of Geology , Beijing, China