1. Research Staff, Dept. of Civil and Environmental Engineering, Princeton Univ., Princeton, NJ 08544. E-mail: jkomlos@princeton.edu
2. Research Associate, Dept. of Geosciences, Princeton Univ., Princeton, NJ 08544. E-mail: bmishra@Princeton.edu
3. Senior Research Associate, The Univ. of Chicago—Center for Advanced Radiation Sources at the National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973. E-mail: lanzirotti@bnl.gov
4. Associate Professor, Dept. of Geosciences, Princeton Univ., Princeton, NJ 08544. E-mail: smyneni@Princeton.edu
5. Professor, Dept. of Civil and Environmental Engineering, Princeton Univ., Princeton, NJ 08544 (corresponding author). E-mail: jaffe@princeton.edu