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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2026. Т. 23. № 3. С. 161-175

Study of landslide activity in Limestone Dagestan using radar interferometry technique

A.I. Zakharov 1 , L.N. Zakharova 1 , A.L. Strom 2, 3 
1 Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino Branch, Fryazino, Moscow Region, Russia
2 Research Institute of Power Engineering Structures — Branch of JSC Institute Hydroproject, Moscow, Russia
3 Sergo Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia
Accepted: 20.04.2026
DOI: 10.21046/2070-7401-2026-23-3-161-175
To study landslide activity in the northern part of Mountainous Dagestan, known as Limestone Dagestan, Sentinel-1 radar images from 2015–2025 and ALOS (Advanced Land Observing Satellite) PALSAR (Phased Array type L-band Synthetic Aperture Radar) images from 2008–2009 were used. Differential interferometry technique was used to measure slopes movements at a number of sites. It was stated that the displacements occur predominantly in the areas of former or modern activity of large cross-bedding rotational landslides. Typical average annual velocity of radial displacements of the landslide surface in the line-of-sight direction of SAR antenna is 1–4 cm. The geological and geomorphological conditions of the areas subject to modern deformations are described. The selected sites require special attention because slow movements detected by differential interferometry could transform into catastrophic collapses of high mountain slopes. At the same time, on the slopes of anticline ridges, armored by a thick complex of carbonate deposits, where numerous large and massive bedding-plane translational landslides occurred in the past, modern deformations are not recorded. This suggests that the formation of these landslides in the past was caused by some triggering factors, supposedly earthquakes.
Keywords: Limestone Dagestan, synthetic aperture radar, radar images, differential interferometry, landslides
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