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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, V. 23, No. 4, pp. 119-136

Applicability of interferometric pairs based on the state of the surface and weather conditions: A case study of Uzon-Geyser volcanic-tectonic depression

M.A. Shiryaev 1 , E.A. Baldina 1 
1 Lomonosov Moscow State University, Moscow, Russia
Accepted: 23.06.2026
DOI: 10.21046/2070-7401-2026-23-4-119-136
We evaluated the potential for optimizing the selection of interferometric pairs based on the surface and weather conditions. The study focuses on the example of identifying potential displacements of the Earth’s surface using differential radar interferometry method (DInSAR) in the Uzon-Geyser volcanic-tectonic depression. Previously, this territory had also been studied using this method. We used Sentinel-1 data from ascending and descending orbits between 2015 and 2025. Processing was carried out using the software tools in Python. Next, we analyzed the impact of surface conditions on coherence using specific quantities. For this purpose, we used ERA5 reanalysis data and MODIS-based products. We selected parameters whose changes demonstrated the strongest relation with coherence. Then we combined these parameters into an integral index which was called the similarity index. The values of this index demonstrated a high correlation with coherence. Interferometric pairs selected by the values of the similarity index generally had high coherence relative to other pairs for the same periods. The results of DInSAR processing using data selection by the similarity index and by the Small Baseline Subset method were almost identical. We also calculated vertical displacements on the basis of the results of data processing from ascending and descending orbits. A series of vertical uplifts and subsidences were detected during the study period. The most significant uplift, amounting to 3.5 cm, occurred between 2023 and 2024. These results highlight the importance of continued monitoring of this area in the future.
Keywords: differential radar interferometry, DInSAR, Sentinel-1, Kamchatka Peninsula, coherence, volcanic zones, reanalysis
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