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Alexander G. Nurmukhamedov – Cand. Sci. (Geology and Mineralogy), Leading Researcher, Research Geotechnological Center of the Far Eastern Branch of the Russian Academy of Sciences
P.O. Box 56, Severo-Vostochnoye shosse, 30, Petropavlovsk- Kamchatsky, 683002, Russian Federation
e-mail: nurmuxamedov1949@mail.ru

Mikhail D. Sidorov – Cand. Sci. (Geology and Mineralogy), Leading Researcher, Research Geotechnological Center of the Far Eastern Branch of the Russian Academy of Sciences
P.O. Box 56, Severo-Vostochnoye shosse, 30, Petropavlovsk- Kamchatsky, 683002, Russian Federation

Yury P. Trukhin – Dr. Sci. (Geology and Mineralogy), Senior Researcher, Research Geotechnological Center of the Far Eastern Branch of the Russian Academy of Sciences
P.O. Box 56, Severo-Vostochnoye shosse, 30, Petropavlovsk- Kamchatsky, 683002, Russian Federation