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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, 2020, Vol. 17, No. 2, pp. 85-98

Zoning of the Tolbachinsky Dol based on InSAR coherence

P.G. Mikhaylyukova 1 , A.I. Zakharov 2 , L.N. Zakharova 2 
1 Lomonosov Moscow State University, Moscow, Россия
2 V.A. Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino Branch, Fryazino, Moscow Region, Russia
Accepted: 26.02.2020
DOI: 10.21046/2070-7401-2020-17-2-85-98
The paper represents the results of geographic demarcation of Tolbachinsky Dol area (Kamchatka, Russia) based on interferometric coherence. Tolbachinsky Dol is a volcanically active region. The last eruption occurred in 2012–2013 and had not been predicted in advance. The formed lava flow is the most strongly scattering object in the volcanic area and could be used as the basis for monitoring the deformations of the volcanic structures. To identify stable zones the coherence values were calculated during interferometric processing of radar data. The data obtained by the C-band images (Sentinel-1, Radarsat-2) and L-band images (ALOS-2) during the period 2013–2016 were used as basic dataset. For each instrument, three interferometric pairs were formed using images acquired in different seasons of the year. Coherence values were calculated using Sarproz and Sarscape software. Based on the coherence values the integral maps were produced to characterize seasonal stability of lava covers of the Tolbachinsky Dol. We have established that the most stable objects of the valley are the lava of the last two eruptions (1975–1976 and 2012–2013). These objects are characterized by maximum coherence values (>0.8) at almost any time of the year. Lavas of stage I and II of volcanism have much lower coherence values: 0.3–0.4 according to the C-band radar images and about 0.6 according to the L-band radar images.
Keywords: Tolbachinsky Dol, lava fields, InSAR, coherence
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