Аннотация:This paper carries out a comparative analysis of the results of applying atmospheric corrections to specific displacement fields calculated by differential interferometry for the volcanic region of Kamchatka during the active phase of eruptions accompanied by significant changes in the atmospheric composition. The atmospheric corrections are calculated in two ways: (1) according to phase delay data from the GACOS (Generic Atmospheric Corrections Online Service) and (2) by delays calculated using an empirical weather model based on data from local meteorological and GNSS stations in Kamchatka. Effectiveness of each correction model is analyzed and its impact on the displacement fields is estimated. A positive result satisfying the conditions of noise and tropospheric effect reduction was obtained for 74% of interferograms with GACOS correction, and for 48% of interferograms corrected using the empirical weather model. In some cases, corrections by the empirical model were more accurate than the GACOS corrections. The analysis of the influence of atmospheric corrections on the displacement field has shown that in some cases the GACOS model introduces changes in the displacement field and forms areas of positive or negative anomalies that have no connection with the original displacement field. The atmospheric correction model calculated from data of regional local meteorological stations that are not included in the international synoptic list is useful for supplementing and developing methods for eliminating the atmospheric component of the interferometric phase. The performed study showed that in the Kamchatka region, GACOS models in many cases allow one to effectively eliminate atmospheric noise and improve the accuracy in estimating displacement fields. At the same time, in some cases the corrections may introduce additional noise; for this reason, we do not recommend using default corrections without comparing the original and corrected displacement fields, with special attention to analyzing the displacements that appeared after the introduction of corrections.
