1. School of Geosciences University of Edinburgh Edinburgh UK
2. Oden Institute for Computational Engineering and Sciences The University of Texas at Austin Austin TX USA
3. Mathematics and Computer Science Division Argonne National Laboratory Lemont IL USA
4. Jackson School of Geosciences The University of Texas at Austin Austin TX USA
5. Institute for Geophysics The University of Texas at Austin Austin TX USA
6. Department of Earth System Science University of California Irvine Irvine CA USA