Division of Geological and Planetary Sciences, Caltech, 1200 E. California Blvd., MC 170-25, Pasadena, CA 91125, United States
Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439, United States
Seismological Laboratory, Division of Geological and Planetary Sciences, Caltech, 1200 E. California Blvd., MC 252-21, Pasadena, CA 91125, United States