1. Earth and Atmospheric Sciences Cornell University Ithaca NY USA
2. Earth and Planets Laboratory Carnegie Institution for Science Washington DC USA
3. Geophysical Institute University of Alaska Fairbanks Fairbanks AK USA
4. Geological and Mining Engineering and Sciences Michigan Technological Houghton MI USA
5. Department of Earth and Planetary Sciences University of New Mexico Albuquerque NM USA
6. Department of Earth Sciences Southern Methodist University Dallas TX USA
7. U.S. Geological Survey—Cascades Volcano Observatory Vancouver WA USA
8. U.S. Geological Survey—Astrogeology Science Center Flagstaff AZ USA
9. U.S. Geological Survey Headquarters Reston VA USA
10. Now at Department of Geology University of Maryland College Park MD USA