{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T01:27:55Z","timestamp":1772155675811,"version":"3.50.1"},"reference-count":47,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2019,1,31]],"date-time":"2019-01-31T00:00:00Z","timestamp":1548892800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100015823","name":"Korea Hydrographic and Oceanographic Agency","doi-asserted-by":"publisher","award":["."],"award-info":[{"award-number":["."]}],"id":[{"id":"10.13039\/501100015823","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Ministry of Land, Infrastructure, and Transport of the Korean government","award":["18RDP-B076564-05"],"award-info":[{"award-number":["18RDP-B076564-05"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Vertical land motion at tide gauges influences sea level rise acceleration; this must be addressed for interpreting reliable sea level projections. In recent years, tide gauge records for the Eastern coast of Korea have revealed rapid increases in sea level rise compared with the global mean. Pohang Tide Gauge Station has shown a +3.1 cm\/year sea level rise since 2013. This study aims to estimate the vertical land motion that influences relative sea level rise observations at Pohang by applying a multi-track Persistent Scatter Interferometric Synthetic Aperture Radar (PS-InSAR) time-series analysis to Sentinel-1 SAR data acquired during 2015\u20132017. The results, which were obtained at a high spatial resolution (10 m), indicate vertical ground motion of \u22122.55 cm\/year at the Pohang Tide Gauge Station; this was validated by data from a collocated global positioning system (GPS) station. The subtraction of InSAR-derived subsidence rates from sea level rise at the Pohang Tide Gauge Station is 6 mm\/year; thus, vertical land motion significantly dominates the sea level acceleration. Natural hazards related to the sea level rise are primarily assessed by relative sea level changes obtained from tide gauges; therefore, tide gauge records should be reviewed for rapid vertical land motion along the vulnerable coastal areas.<\/jats:p>","DOI":"10.3390\/rs11030277","type":"journal-article","created":{"date-parts":[[2019,2,1]],"date-time":"2019-02-01T03:08:05Z","timestamp":1548990485000},"page":"277","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Sinking Tide Gauge Revealed by Space-borne InSAR: Implications for Sea Level Acceleration at Pohang, South Korea"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7969-9162","authenticated-orcid":false,"given":"Suresh Krishnan","family":"Palanisamy Vadivel","sequence":"first","affiliation":[{"name":"School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea"}]},{"given":"Duk-jin","family":"Kim","sequence":"additional","affiliation":[{"name":"School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6037-8839","authenticated-orcid":false,"given":"Jungkyo","family":"Jung","sequence":"additional","affiliation":[{"name":"Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91125, USA"}]},{"given":"Yang-Ki","family":"Cho","sequence":"additional","affiliation":[{"name":"School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea"}]},{"given":"Ki-Jong","family":"Han","sequence":"additional","affiliation":[{"name":"Industrial Technology Center, UST21, Incheon 21999, Korea"}]},{"given":"Kwang-Young","family":"Jeong","sequence":"additional","affiliation":[{"name":"Ocean Research Division, Korea Hydrographic and Oceanographic Agency, Busan 49111, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2019,1,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"360","DOI":"10.1038\/nclimate2923","article-title":"Consequences of twenty-first-century policy for multi-millennial climate and sea-level change","volume":"6","author":"Clark","year":"2016","journal-title":"Nat. Clim. Chang."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1038\/nature14093","article-title":"Probabilistic reanalysis of twentieth-century sea-level rise","volume":"517","author":"Hay","year":"2015","journal-title":"Nature"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1445","DOI":"10.1126\/science.342.6165.1445-a","article-title":"Sea-level rise by 2100","volume":"342","author":"Church","year":"2013","journal-title":"Science"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"777","DOI":"10.1002\/joc.1771","article-title":"Evidence for the accelerations of sea level on multi-decade and century timescales","volume":"29","author":"Woodworth","year":"2009","journal-title":"Int. J. Climatol."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"W\u00f6ppelmann, G., Pouvreau, N., Coulomb, A., Simon, B., and Woodworth, P.L. (2008). Tide gauge datum continuity at brest since 1711: France\u2019s longest sea-level record. Geophys. Res. Lett., 35.","DOI":"10.1029\/2008GL035783"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Men\u00e9ndez, M., and Woodworth, P.L. (2010). Changes in extreme high water levels based on a quasi-global tide-gauge data set. J. Geophys. Res. Oceans, 115.","DOI":"10.1029\/2009JC005997"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"945","DOI":"10.1007\/s10712-011-9171-x","article-title":"An assessment of two-dimensional past sea level reconstructions over 1950\u20132009 based on tide-gauge data and different input sea level grids","volume":"33","author":"Meyssignac","year":"2012","journal-title":"Surv. Geophys."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/j.gloplacha.2011.03.002","article-title":"Two-dimensional reconstruction of the Mediterranean sea level over 1970\u20132006 from tide gage data and regional ocean circulation model outputs","volume":"77","author":"Meyssignac","year":"2011","journal-title":"Glob. Planet. Chang."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"193","DOI":"10.5194\/os-5-193-2009","article-title":"A new assessment of the error budget of global mean sea level rate estimated by satellite altimetry over 1993\u20132008","volume":"5","author":"Ablain","year":"2009","journal-title":"Ocean Sci."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"145","DOI":"10.1080\/01490410050128591","article-title":"An improved calibration of satellite altimetric heights using tide gauge sea levels with adjustment for land motion","volume":"23","author":"Mitchum","year":"2000","journal-title":"Mar. Geod."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1284","DOI":"10.1016\/j.asr.2012.06.005","article-title":"The challenges in long-term altimetry calibration for addressing the problem of global sea level change","volume":"51","author":"Fu","year":"2013","journal-title":"Adv. Space Res."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"565","DOI":"10.1038\/nclimate2635","article-title":"Unabated global mean sea-level rise over the satellite altimeter era","volume":"5","author":"Watson","year":"2015","journal-title":"Nat. Clim. Chang."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1639","DOI":"10.1016\/j.asr.2018.07.017","article-title":"Contemporary Sea Level Changes from Satellite Altimetry: What Have We Learned? What are the New Challenges?","volume":"62","author":"Cazenave","year":"2018","journal-title":"Adv. Space Res."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"14752","DOI":"10.1038\/s41598-017-15309-5","article-title":"Spaceborne synthetic aperture radar survey of subsidence in Hampton Roads, Virginia (USA)","volume":"7","author":"Bekaert","year":"2017","journal-title":"Sci. Rep."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"6346","DOI":"10.1038\/ncomms7346","article-title":"An extreme event of sea-level rise along the northeast coast of North America in 2009\u20132010","volume":"6","author":"Goddard","year":"2015","journal-title":"Nat. Commun."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Hung, W.-C., Hwang, C., Chen, Y.-A., Zhang, L., Chen, K.-H., Wei, S.-H., Huang, D.-R., and Lin, S.-H. (2018). Land Subsidence in Chiayi, Taiwan, from Compaction Well, Leveling and ALOS\/PALSAR: Aquaculture-Induced Relative Sea Level Rise. Remote Sens., 10.","DOI":"10.3390\/rs10010040"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"3126","DOI":"10.1002\/2016GL068015","article-title":"Subsidence along the atlantic coast of North America: Insights from gps and late holocene relative sea level data","volume":"43","author":"Karegar","year":"2016","journal-title":"Geophys. Res. Lett."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"084016","DOI":"10.1088\/1748-9326\/10\/8\/084016","article-title":"Vertical ground motion and historical sea-level records in Dakar (Denegal)","volume":"10","author":"Raucoules","year":"2015","journal-title":"Environ. Res. Lett."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Kuo, C.Y., Shum, C.K., Braun, A., and Mitrovica, J.X. (2004). Vertical crustal motion determined by satellite altimetry and tide gauge data in Fennoscandia. Geophys. Res. Lett., 31.","DOI":"10.1029\/2003GL019106"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1002\/2015RG000502","article-title":"Vertical land motion as a key to understanding sea level change and variability","volume":"54","author":"Marcos","year":"2016","journal-title":"Rev. Geophys."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Burgos, A.G., Hamlington, B.D., Thompson, P.R., and Ray, R.D. (2018). Future nuisance flooding in Norfolk, VA, from astronomical tides and annual to decadal internal climate variability. Geophys. Res. Lett., 45.","DOI":"10.1029\/2018GL079572"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Cazenave, A., and Nerem, R.S. (2004). Present-day sea level change: Observations and causes. Rev. Geophys., 42.","DOI":"10.1029\/2003RG000139"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"386","DOI":"10.1016\/j.rse.2013.08.021","article-title":"High nonlinear urban ground motion in Manila (Philippines) from 1993 to 2010 observed by dinsar: Implications for sea-level measurement","volume":"139","author":"Raucoules","year":"2013","journal-title":"Remote Sens. Environ."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"6779","DOI":"10.1029\/90JB02067","article-title":"Influence of glacial isostatic adjustment on tide gauge measurements of secular sea level change","volume":"96","author":"Peltier","year":"1991","journal-title":"J. Geophys. Res. Solid Earth"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1026","DOI":"10.1038\/35059054","article-title":"Recent mass balance of polar ice sheets inferred from patterns of global sea-level change","volume":"409","author":"Mitrovica","year":"2001","journal-title":"Nature"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"6076","DOI":"10.1002\/2013JC008867","article-title":"New zealand 20th century sea level rise: Resolving the vertical land motion using space geodetic and geological data","volume":"118","author":"Fadil","year":"2013","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"16085","DOI":"10.1038\/srep16085","article-title":"Coastal sea level projections with improved accounting for vertical land motion","volume":"5","author":"Han","year":"2015","journal-title":"Sci. Rep."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Lim, C., Park, S.-H., Kim, D.-Y., Woo, S.-B., and Jeong, K.-Y. (2017). Influence of steric effect on the rapid sea level rise at Jeju Island, Korea. J. Coast. Res., 189\u2013193.","DOI":"10.2112\/SI79-039.1"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"138","DOI":"10.1016\/j.jher.2014.12.002","article-title":"Sea level rise around Korea: Analysis of tide gauge station data with the ensemble empirical mode decomposition method","volume":"11","author":"Kim","year":"2016","journal-title":"J. Hydro-Environ. Res."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"396","DOI":"10.1016\/j.gloplacha.2007.02.002","article-title":"Geocentric sea-level trend estimates from gps analyses at relevant tide gauges world-wide","volume":"57","author":"Bouin","year":"2007","journal-title":"Glob. Planet. Chang."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"W\u00f6ppelmann, G., and Marcos, M. (2012). Coastal sea level rise in Southern Europe and the nonclimate contribution of vertical land motion. J. Geophys. Res. Oceans, 117.","DOI":"10.1029\/2011JC007469"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"138","DOI":"10.1038\/364138a0","article-title":"The displacement field of the Landers earthquake mapped by radar interferometry","volume":"364","author":"Massonnet","year":"1993","journal-title":"Nature"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"8","DOI":"10.1109\/36.898661","article-title":"Permanent scatterers in SAR interferometry","volume":"39","author":"Ferretti","year":"2001","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Hooper, A., Zebker, H., Segall, P., and Kampes, B. (2004). A new method for measuring deformation on volcanoes and other natural terrains using InSAR persistent scatterers. Geophys. Res. Lett., 31.","DOI":"10.1029\/2004GL021737"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"2375","DOI":"10.1109\/TGRS.2002.803792","article-title":"A new algorithm for surface deformation monitoring based on small baseline differential SAR interferograms","volume":"40","author":"Berardino","year":"2002","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"2953","DOI":"10.1002\/grl.50568","article-title":"Is land subsidence increasing the exposure to sea level rise in Alexandria, Egypt?","volume":"40","author":"Cozannet","year":"2013","journal-title":"Geophys. Res. Lett."},{"key":"ref_37","first-page":"519","article-title":"Spatial Variability in long-term changes of climate and oceanographic conditions in Korea","volume":"29","author":"Jung","year":"2008","journal-title":"J. Environ. Biol."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"2290","DOI":"10.1002\/joc.2236","article-title":"Changes in the extreme daily rainfall in South Korea","volume":"31","author":"Park","year":"2011","journal-title":"Int. J. Climatol."},{"key":"ref_39","unstructured":"Rosen, P.A., Gurrola, E., Sacco, G.F., and Zebker, H. (2012, January 23\u201326). The InSAR scientific computing environment. Proceedings of the 9th European Conference on Synthetic Aperture Radar, N\u00fcrnberg, Germany."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"3179","DOI":"10.1109\/TGRS.2011.2178247","article-title":"Tops interferometry with TerraSAR-X","volume":"50","author":"Scheiber","year":"2012","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Hooper, A., Segall, P., and Zebker, H. (2007). Persistent scatterer interferometric synthetic aperture radar for crustal deformation analysis, with application to Volc\u00e1n Alcedo, Gal\u00e1pagos. J. Geophys. Res. Solid Earth, 112.","DOI":"10.1029\/2006JB004763"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"338","DOI":"10.1364\/JOSAA.18.000338","article-title":"Two-dimensional phase unwrapping with use of statistical models for cost functions in nonlinear optimization","volume":"18","author":"Chen","year":"2001","journal-title":"J. Opt. Soc. Am. A"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"134","DOI":"10.1016\/j.enggeo.2017.01.011","article-title":"Quantifying groundwater exploitation induced subsidence in the Rafsanjan plain, southeastern Iran, using InSAR time-series and in situ measurements","volume":"218","author":"Motagh","year":"2017","journal-title":"Eng. Geol."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"77","DOI":"10.1016\/j.enggeo.2009.11.005","article-title":"Integrated analysis of SAR interferometric and geological data for investigating long-term reclamation settlement of Chek Lap Kok Airport, Hong Kong","volume":"110","author":"Jiang","year":"2010","journal-title":"Eng. Geol."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"4031","DOI":"10.1175\/JCLI-D-15-0580.1","article-title":"Influence of climate variability on extreme ocean surface wave heights assessed from ERA-interim and ERA-20c","volume":"29","author":"Kumar","year":"2016","journal-title":"J. Clim."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"5490","DOI":"10.1002\/2015JC010923","article-title":"The seasonal cycle and variability of sea level in the South China Sea","volume":"120","author":"Amiruddin","year":"2015","journal-title":"J. Geophys. Res. Oceans"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"585","DOI":"10.1007\/s10712-011-9119-1","article-title":"Sea-level rise from the late 19th to the early 21st century","volume":"32","author":"Church","year":"2011","journal-title":"Surv. Geophys."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/11\/3\/277\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T12:29:57Z","timestamp":1760185797000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/11\/3\/277"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,1,31]]},"references-count":47,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2019,2]]}},"alternative-id":["rs11030277"],"URL":"https:\/\/doi.org\/10.3390\/rs11030277","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,1,31]]}}}