1. German Research Centre for Geosciences, Remote Sensing, Potsdam, Germany
2. Leibniz University Hannover, Institute of Photogrammetry and GeoInformation, Hannover, Germany
3. German Research Centre for Geosciences, Physics of Earthquakes and Volcanoes, Potsdam, Germany
4. Kamchatkan Branch of Geophysical Survey, Russian Academy of Sciences, Petropavlovsk-Kamchatskii, Russia
5. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia