Impact of seismotectonic processes on the geoelectrical parameters of permafrost in the Altai mountains

   Research object. The epicentral zone of the destructive Chuya earthquake of 2003 (M = 7.2), characterized by a prolonged nonlinear aftershock period. The epicenter of the earthquake was located in the intermountain pass between the Chuya and Kurai depressions of the Altai Mountains, only 15 km from the study site located in the western part of the Chuya depression in the Chagan River valley.

   Aim. To determine the geoelectrical structure of the Chagan River valley, to identify areas of development of permafrost deposits. Additionally, to track the dynamics of changes in the geoelectrical parameters of permafrost deposits during the aftershock period of the earthquake based on regular long-term observations, and to compare the geoelectrical data with the seismicity characteristics of the Chuya–Kurai seismic active zone.

   Methods. Electromagnetic methods with a controlled source were used to study the distribution of permafrost deposits in the valley, which exhibited uneven distribution.

   Results. The study allowed us to determine variations in the thickness and specific electrical resistivity of the layers of permafrost. Comparison of the seismic activity parameters of the area with the geo-electrical characteristics of the permafrost showed a significant influence of changes in seismic regime on these properties. During the periods of activation, permafrost degraded, while recovery occurred during the periods of reduced activity, with variations in geo-electrical parameters reaching 50–80 %.

   Conclusions. The obtained results demonstrate the potential of using electromagnetic methods for continuous monitoring of the state of permafrost, emphasizing their effectiveness in understanding the relationship between seismic activity and the state of permafrost.

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