Recent Movements and Deformations of the Earth’s Crust in the Region of Avacha Volcano (Kamchatka Peninsula) from 2015 to 2023

Abstract

The article presents the results of studies of modern movements and deformations according to GNSS observations in the area of Avacha volcano in 2015–2023. Studies of Avacha volcano are particularly important, because it is an active volcano closest to the administrative center of Kamchatka Krai. Interesting features of the local geodynamics of the area were revealed. Horizontal and vertical displacements, dilatation, and full shear deformations, as well as characteristics of the deficit of “internal” displacements were analyzed. In the southern part of the network, there is an accumulation of compression deformation due to pressure from the subduction zone. In the vicinity of the volcanic crater, tensile strain accumulates in the absence of significant uplift. The characteristics of the internal displacement deficit show the response of the GNSS network to the M6.5 earthquake (April 3, 2023) All changes in the characteristics of crustal motions and deformations demonstrated about a 2-year cyclicity. In further observations it will be possible to evaluate the stability of this phenomenon. Also noteworthy is the need to expand the GNSS observation network to the northern slope and foot of Avacha volcano for more detailed geodetic monitoring of its state.