1. Department of Applied Mathematics University of Colorado Boulder Boulder CO USA
2. Department of Mathematics University of North Carolina at Chapel Hill Chapel Hill NC USA
3. Institute of Applied Physics Russian Academy of Sciences Nizhnyi Novgorod Russia
4. Department of Engineering Science and Mechanics Pennsylvania State University PA USA
5. Center of Earthquake Research and Information University of Memphis Memphis TN USA
6. Geophysics Group Los Alamos National Laboratory Los Alamos NM USA