Leonard Seydoux, Universite Grenoble Alpes, ISTerre, Grenoble, France, Jean Soubestre, Instituto Volcanologico de Canarias (INVOLCAN), San Cristobal de La Laguna, Spain, Nikolai Shapiro, Institut de Physique du Globe, Paris, France, Julien de Rosny, ESPCI, Institut Langevin, CNRS, Paris Cedex 05, France, Dmitry Droznin, Kamchatka Branch of the Geophysical Survey RAS, Petropavlovsk-Kamchatsky, Russia, Svetlana Droznina, Organization Not Listed, Washington, DC, United States, Sergey Senyukov, Kamchatkan Branch of Geophysical Survey RAS, Petropavlovsk-Kamchatsky, Russia and Evgenii Gordeev, Institute of Volcanology and Seismology, Petropavlovsk Kamcha, Russia