1. Hawaii Institute of Geophysics and Planetology; University of Hawaii at Manoa; Honolulu; Hawaii; 96822; USA
2. Hawaiian Volcano Observatory; US Geological Survey; Hawaii National Park; Hawaii; 96718; USA
3. Department of Earth and Planetary Sciences; Harvard University; Cambridge; Massachusetts; 02138; USA
4. Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography; University of California at San Diego; La Jolla; California; 92093; USA