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This paper presents a complementary study of Interferometric Synthetic Aperture Radar (InSAR) and Ground Penetrating Radar (GPR) for the early detection of subsidence and sinkhole phenomena. The methodology was applied to a coastal urban area in Galicia, northwest Spain (humid region), showing apparent signs of subsidence and building settlement during the last two years. Two different InSAR methods are compared for the period from June 2021 to March 2022: PSI (Persistent Scatterer Interferometry) and SBAS (Small Baseline Subsets), and the average deformation velocities obtained resulted in \u22123.0 mm\/yr and \u22124.1 mm\/yr, respectively. Additional GPR data were collected in January 2022 to validate the InSAR results, which detected subsidence in agreement with the persistent scatters obtained from the PSI method. This is crucial information to plan preventive maintenance.<\/jats:p>","DOI":"10.3390\/rs15153729","type":"journal-article","created":{"date-parts":[[2023,7,27]],"date-time":"2023-07-27T02:07:17Z","timestamp":1690423637000},"page":"3729","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Using InSAR and GPR Techniques to Detect Subsidence: Application to the Coastal Area of \u201cA Xunqueira\u201d (NW Spain)"],"prefix":"10.3390","volume":"15","author":[{"given":"Alex","family":"Alonso-D\u00edaz","sequence":"first","affiliation":[{"name":"CINTECX, GeoTECH Research Group, Universidade de Vigo, 36310 Vigo, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3191-5839","authenticated-orcid":false,"given":"Josu\u00e9","family":"Casado-Rabasco","sequence":"additional","affiliation":[{"name":"Department of Cartographic and Terrain Engineering, Universidad de Salamanca, Calle Hornos Caleros, 50, 05003 Avila, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1042-4985","authenticated-orcid":false,"given":"Mercedes","family":"Solla","sequence":"additional","affiliation":[{"name":"CINTECX, GeoTECH Research Group, Universidade de Vigo, 36310 Vigo, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9427-3864","authenticated-orcid":false,"given":"Susana","family":"Lag\u00fcela","sequence":"additional","affiliation":[{"name":"Department of Cartographic and Terrain Engineering, Universidad de Salamanca, Calle Hornos Caleros, 50, 05003 Avila, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"65","DOI":"10.1016\/j.enggeo.2012.07.002","article-title":"Application of risk, cost\u2013benefit and acceptability analyses to identify the most appropriate geosynthetic solution to mitigate sinkhole damage on roads","volume":"145\u2013146","author":"Galve","year":"2012","journal-title":"Eng. 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