By Rich Briggs1, Shengji Wei2, Eric Fielding2, Sebastien Leprince2, Anthony Sladen2, Risheng Chu2, Mark Simons2, Jean-Philippe Avouac2, Egill Hauksson2, Donald V. Helmberger2, Rowena Lohman2, Ken Hudnut2, Sinan Akciz2
1. U.S. Geological Survey 2. Multiple