Mantle and Crustal Sources of Magmatic Activity of Klyuchevskoy and Surrounding Volcanoes in Kamchatka Inferred From Earthquake Tomography

A groundbreaking seismic tomographic model of the Kamchatka region reveals that the magmatic activity beneath Klyuchevskoy and surrounding volcanoes is driven by asthenospheric flow through a slab window at the Kamchatka-Aleutian junction. This study, utilizing unprecedented high-resolution data from local earthquakes recorded during an international experiment (2015–2016), identified high-velocity anomalies in the upper crust linked to ancient basaltic shield volcanoes and a prominent low-velocity anomaly in the uppermost mantle associated with the eastern branch of the Central Kamchatka Depression, interpreted as a recent rift zone. The interaction between hot asthenospheric material and slab-derived fluids is proposed as the key mechanism shaping volcanic activity in this region.

Koulakov, I., Shapiro, N. M., Sens‐Schönfelder, C., Luehr, B. G., Gordeev, E. I., Jakovlev, A., Abkadyrov, I., Chebrov, D. V., Bushenkova, N., Droznina, S. Y., Senyukov, S. L., Novgorodova, A., & Stupina, T. (2020). Mantle and Crustal Sources of Magmatic Activity of Klyuchevskoy and Surrounding Volcanoes in Kamchatka Inferred From Earthquake Tomography. Journal of Geophysical Research: Solid Earth, 125(10). Portico. https://doi.org/10.1029/2020jb020097