Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2025, V. 22, No. 6, pp. 400-411
Observation of the deformation of Krasheninnikov volcano slopes after eruption in August 2025 using InSAR techniques
L.N. Zakharova
1 , A.I. Zakharov
1 1 Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino Branch, Fryazino, Moscow Region, Russia
Accepted: 13.11.2025
DOI: 10.21046/2070-7401-2025-22-6-400-411
A series of Sentinel-1 SAR interferometric image pairs covering the period from the end of July to the end of August 2025 were used to measure for the first time in the history of observations the small-scale surface displacements on the slopes of Krasheninnikov volcano and to describe their dynamics caused by the eruption started on August 3. The components of vertical and horizontal displacements were extracted from a combination of surface displacement measurements along slant range directions from radar to scattering surface being acquired from eastern and western sides. It was found that the active surface deformations began 1–2 days before the eruption, shortly after the earthquake. An interpretation of the observed displacement components is proposed: a radially symmetric deformation geometric model. According to this model, the measured displacements indicate a horizontal expansion of the volcano’s vent by at least one and a half meters. The vertical displacement zones are insignificant in the area and have maximum amplitude of approximately 31 cm. A 16 cm subsidence zone on the northern slope occurred likely as a result of the formation of underground cavity because of the lava outflow. The path of the lava stream and its dynamics were also traced in the interferograms and interferometric coherence maps.
Keywords: synthetic aperture radar interferometry, surface displacements, eruption, Krasheninnikov Volcano
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