1. Wilson Infrasound Observatory, Alaska Volcano Observatory, Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
2. Now at Geophysical Monitoring Program; Lawrence Livermore National Laboratory; Livermore California USA
3. Institute for Geothermal Sciences; Kyoto University; Kumamoto Japan
4. Department of Geological Sciences; University of North Carolina at Chapel Hill; Chapel Hill North Carolina USA