## Supplementary Materials  
The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/rs14040844/s1](https://www.mdpi.com/article/10.3390/rs14040844/s1)]([https://www.mdpi.com/article/10.3390/rs14040844/s1](https://www.mdpi.com/article/10.3390/rs14040844/s1)), Figure S1. ESRI map with the ID frames of LiCSAR Portal (red outline is descending; blue outline is ascending frame). Green rhomb indicates the location of the reference point used in the InSAR analysis. Figure S2. Data processing flow chart used in this study. The arrows indicate input/output actions. The products are shown in orange. Figure S3. Unw_org corresponds to the interferogram before the GACOS correction, and Unw_cor corresponds to the interferogram after the GACOS correction. The standard deviation (STD) decreased from 3.2 rad to 2.4 rad. The reduction rate for this interferogram is 26.6%. The dates of the interferometric pair are 24 January 2019 and 17 February 2019. (Ascending Orbit). Figure S4. Unw_org corresponds to the interferogram before the GACOS correction, and Unw_cor corresponds to the interferogram after the GACOS correction. The standard deviation (STD) decreased from 5.2 rad to 2.2 rad. The reduction rate for this interferogram is 60.1%. The dates of the interferometric pair are 13 December 2016 and 4 January 2017. (Descending Orbit). Figure S5. Graph showing the time series of displacement of the village of Krini corresponding to the pixel enclosing the GNSS station (ascending orbit). Vel(1) indicates the velocity of this pixel (blue line) after the spatio-temporal filtering and deramping. Figure S7. Field photograph showing the antenna of KRIN GNSS Station. View to the northeast. Photograph was taken on 7 May 2021. Figure S8. Graph showing the geometry of the LOS velocity vector. 34.58\({}^{\circ}\) is the incidence angle in the Krini study area. Figure S9. Graph showing the trend differences between InSAR and GNSS LOS displacements (descending orbit) of the same dates during the common period of observation (58 common dates). For comparison, the blue-line indicates a perfect (1:1) correlation. Figure S10. LOS-Projected GNSS Time series (KRIN station; black points) and InSAR position time series (orange points, ascending orbit) of the pixel which contains the GNSS station. Figure S11. Graphs showing position time series and average monthly rainfall (Kato Vlassia station, top panel) for the period September 2020-May 2021 and corresponding graphs (middle and lower panel) showing cross-correlation results. The corresponding displacement rates are reported in Table 2. Table S1. Dataset of Sentinel-1 SAR acquisitions of ascending and descending orbit used in this study. Conceptualization, A.G. and V.T. ; methodology, V.T., A.G.; soft-ware, V.T. ; validation, V.T., A.G. and I.K. ([PERSON]); formal analysis, V.T. ; investigation, V.T., A.G.; resources, E.E., I.K. ([PERSON]); data curation, V.T., E.E. and I.K. ([PERSON]); writing--original draft preparation, V.T., A.G., I.K. ([PERSON]); writing--review and editing, V.T., A.G., I.K. ([PERSON]), E.E., I.K. ([PERSON]), E.S. ; visualization, V.T. ; supervision, A.G., I.K. ([PERSON]), E.S. ; project administration, A.G.; funding acquisition, A.G. All authors have read and agreed to the published version of the manuscript. This research was funded by the research project 'Platform of multidimensional monitoring with micro sensors of Enceladus of Hellenic Supersite-PROION' with Grant Number: MIS-5070928. [[https://proion-hellas.eu/](https://proion-hellas.eu/)]([https://proion-hellas.eu/](https://proion-hellas.eu/)) (accessed on 20 January 2022). Not applicable. The InSAR data are freely accessible through the LiCSAR--Copernicus portals; The rainfall data are available through www.meteo.gr (data accessed on 20 December 2021); GNSS observations (daily files) are available via the CNRS-CRL web portal. We thank the CRL team which operated the GNSS station KRIN. Thanks to PROION partners for comment and discussions.