Sonja A Behnke¹, Harald E Edens², Seda Senay³, Jeffrey Bruce Johnson⁴, Kenneth Eack¹, Michael Caffrey¹, James P Theiler¹, Alexa R Van Eaton⁵, David J Schneider⁶, Masato Iguchi⁷ and Daisuke Miki⁷, (1)Los Alamos National Laboratory, Los Alamos, NM, United States, (2)New Mexico Institute of Mining and Technology, Department of Physics and Langmuir Laboratory, Socorro, NM, United States, (3)New Mexico Institute of Mining and Technology, Electrical Engineering, Socorro, NM, United States, (4)Boise State University, Department of Geosciences, Boise, ID, United States, (5)USGS Cascades Volcano Observatory, Vancouver, WA, United States, (6)USGS Alaska Volcano Observatory, Anchorage, AK, United States, (7)Kyoto University, Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kagoshima, Japan