Using observations from a large-scale seismic station network, we built a seismic tomography model of velocity anomalies for longitudinal (P-wave) and transverse (S-wave) seismic waves beneath the Klyuchevskaya group of volcanoes. The observational network (about 150 km) and the number of seismic stations (about 200) made it possible to determine the velocity structure to depths of 150 km. A low-velocity anomaly is observed almost beneath all volcanoes in the Klyuchevskaya group of volcanoes at a depth of 50 km. Beneath the Shiveluch volcano, in the region where the subduction plate discontinues, an anomaly can be detected to depths of 150 km. Most likely, in this zone, there is a channel for the penetration of magmatic melts to the surface along the boundary of the submerging Pacific Plate ending. This is indirectly confirmed by the presence of a mantle plume to a depth of 1000 km, as previously shown by the seismic tomography studies and an anomalous heat flow at the junction of the Kuril–Kamchatka and Aleutian island arcs.

中文翻译：

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克柳切夫火山群（堪察加）的岩浆供给系统

利用来自大型地震台站网络的观测结果，我们建立了 Klyuchevskaya 火山群下方纵向（P 波）和横向（S 波）地震波速度异常的地震层析成像模型。观测网络（约 150 公里）和地震台站的数量（约 200 个）使得确定 150 公里深度的速度结构成为可能。在 Klyuchevskaya 火山群中，几乎所有火山下方都观察到了 50 公里深度的低速异常。在 Shiveluch 火山下方，在俯冲板块中断的区域，可以检测到 150 公里深处的异常。最有可能的是，在这一带中，有一条岩浆熔体沿着太平洋板块下沉边界向地表渗透的通道。