1. Department of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu
2. Montana Bureau of Mines and Geology, 1300 West Park Street, Butte, Montana 59701 U.S.A.
3. Idaho National Laboratory, P.O. Box 1625, MS 2203, Idaho Falls, Idaho 83415 U.S.A.
4. National Earthquake Information Center, U.S. Geological Survey, Denver Federal Center, Box 25046, MS 966, Denver, Colorado 80225 U.S.A.