1. Department of Earth Science; Rice University; Houston Texas USA
2. State Key Laboratory of Petroleum Resource and Prospecting, and Unconventional Natural Gas Institute; China University of Petroleum; Beijing China
3. Department of Physics; University of Toronto; Toronto Ontario Canada
4. Department of Geosciences; Princeton University; Princeton New Jersey USA
5. Program in Applied and Computational Mathematics; Princeton University; Princeton New Jersey USA
6. Institute of Geophysics; China Earthquake Administration; Beijing China