“…According to some estimates, Kamchatka has the largest number of Quaternary calderas per unit of arc length in the world (Hughes and Mahood, 2008). Kamchatka tephra layers provide chronological control for deposits and events over large areas, both in Kamchatka and farther afield, up to Greenland and North America, which is critical for many studies (e.g., Cook et al, 2018;Hulse et al, 2011;Kozhurin et al, 2014;Mackay et al, 2016;Pendea et al, 2016;Pinegina et al, 2013Pinegina et al, , 2014Pinegina et al, , 2012Plunkett et al, 2015;van der Bilt et al, 2017). However, geochemical characterization of Kamchatka volcanic glasses is still in a developing phase.…”