**Acknowledgements**

The author is grateful to her colleagues who took part in organizing and conducting field works on volcanic regions in different parts of the world, at first D.V. Mikhalev without whom most trips would not be possible, and also D.V. Mishurinsky, V.A. Pellinen, T.M. Skovitina, S.S. Chernomorets, A.V. Kopanina, as well as employees of the Kuril and Kronotsky Reserves. Field works in the Geysernaya river valley were supported by the Russian Science Foundation Grant No. 21-17-00216.
