1. Earth Physics Department, Faculty of PhysicsM.V. Lomonosov Moscow State University Moscow Russia
2. Institute of Physics and TechnologyUral Federal University Ekaterinburg Russia
3. Institute of Geology and Petroleum TechnologiesKazan Federal University Kazan Russia
4. Aix‐Marseille Université, CNRS, IRD, CEREGE UM34 Aix en Provence France
5. Institute for Nuclear ResearchRussian Academy of Sciences Moscow Russia