{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,15]],"date-time":"2026-04-15T03:21:20Z","timestamp":1776223280954,"version":"3.50.1"},"reference-count":65,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2021,4,24]],"date-time":"2021-04-24T00:00:00Z","timestamp":1619222400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Modelling of combined Global Navigation Satellite System (GNSS) and Interferometric Synthetic Aperture Radar (InSAR) data was performed to characterize the source of the Mw6.9 earthquake that occurred to the north of Samos Island (Aegean Sea) on 30 October 2020. Pre-seismic analysis revealed an NNE\u2013SSW extensional regime with normal faults along an E\u2013W direction. Co-seismic analysis showed opening of the epicentral region with horizontal and vertical displacements of ~350 mm and ~90 mm, respectively. Line-of-sight (LOS) interferometric vectors were geodetically corrected using the GNSS data and decomposed into E\u2013W and vertical displacement components. Compiled interferometric maps reveal that relatively large ground displacements had occurred in the western part of Samos but had attenuated towards the eastern and southern parts. Alternating motions occurred along and across the main geotectonic units of the island. The best-fit fault model has a two-segment listric fault plane (average slip 1.76 m) of normal type that lies adjacent to the northern coastline of Samos. This fault plane is 35 km long, extends to 15 km depth, and dips to the north at 60\u00b0 and 40\u00b0 angles for the upper and lower parts, respectively. A predominant dip-slip component and a substantial lateral one were modelled.<\/jats:p>","DOI":"10.3390\/rs13091665","type":"journal-article","created":{"date-parts":[[2021,4,25]],"date-time":"2021-04-25T02:12:57Z","timestamp":1619316777000},"page":"1665","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Ground Deformation Modelling of the 2020 Mw6.9 Samos Earthquake (Greece) Based on InSAR and GNSS Data"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2466-7446","authenticated-orcid":false,"given":"Vassilis","family":"Sakkas","sequence":"first","affiliation":[{"name":"Department of Geophysics-Geothermics, National Kapodistrian University of Athens, Panepistimiopolis Zografou, 15784 Athens, Greece"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1425","DOI":"10.1007\/s00024-017-1474-5","article-title":"The Stress\/Strain Analysis of Kinematic Structure at G\u00fclbah\u00e7e Fault and Uzunkuyu Intrusive (\u0130zmir, Turkey)","volume":"174","year":"2017","journal-title":"Pure Appl. Geophys."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"116246","DOI":"10.1016\/j.epsl.2020.116246","article-title":"Active crustal deformation and rotations in the southwestern Balkans from continuous GPS measurements","volume":"539","author":"Koci","year":"2020","journal-title":"Earth Planet. Sci. Lett."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1016\/j.tecto.2009.05.027","article-title":"Geodetic constraints on the tectonic evolution of the Aegean region and strain accumulation along the Hellenic subduction zone","volume":"488","author":"Reilinger","year":"2010","journal-title":"Tectonophysics"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"323","DOI":"10.1146\/annurev-earth-040809-152419","article-title":"The miocene-to-present kinematic evolution of the eastern mediterranean and middle east and its implications for dynamics","volume":"38","author":"Kreemer","year":"2010","journal-title":"Annu. Rev. Earth Planet. Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1016\/S0031-9201(03)00138-9","article-title":"Relocation of the 26 July 2001 Skyros Island (Greece) earthquake sequence using the double-difference technique","volume":"138","author":"Roumelioti","year":"2003","journal-title":"Phys. Earth Planet. Inter."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1016\/j.epsl.2004.06.018","article-title":"Constraints on the evolution and vertical coherency of deformation in the Northern Aegean from a comparison of geodetic, geologic and seismologic data","volume":"225","author":"Kreemer","year":"2004","journal-title":"Earth Planet. Sci. Lett."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"8","DOI":"10.1046\/j.1365-246X.2003.01917.x","article-title":"An integrated global model of present-day plate motions and plate boundary deformation","volume":"154","author":"Kreemer","year":"2003","journal-title":"Geophys. J. Int."},{"key":"ref_8","first-page":"34","article-title":"Velocity and deformation fields in the North Aegean domain, Greece, and implications for fault kinematics, derived from GPS data 1993\u20132009","volume":"597\u2013598","author":"Geiger","year":"2013","journal-title":"Tectonophysics"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1016\/j.marpetgeo.2017.03.010","article-title":"Investigation on the tectonic significance of Izmir, Uzunada Fault Zones and other tectonic elements in the Gulf of Izmir, western Turkey, using high resolution seismic data","volume":"83","author":"Coskun","year":"2017","journal-title":"Mar. Pet. Geol."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"308","DOI":"10.1016\/j.gr.2019.07.005","article-title":"Tectonic units of the Alpine collision zone between Eastern Alps and western Turkey","volume":"78","author":"Schmid","year":"2020","journal-title":"Gondwana Res."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"5","DOI":"10.3809\/jvirtex.2007.00180","article-title":"Samos Island, Part I: Metamorphosed and non-metamorphosed nappes, and sedimentary basins","volume":"27","author":"Ring","year":"2007","journal-title":"J. Virtual Explor."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1016\/j.tecto.2019.01.016","article-title":"Slab fragmentation beneath the Aegean\/Anatolia transition zone: Insights from the tectonic and metamorphic evolution of the Eastern Aegean region","volume":"754","author":"Roche","year":"2019","journal-title":"Tectonophysics"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1575","DOI":"10.1016\/S0191-8141(99)00108-X","article-title":"Structural analysis of a complex nappe sequence and late-orogenic basins from the Aegean Island of Samos, Greece","volume":"21","author":"Ring","year":"1999","journal-title":"J. Struct. Geol."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Nomikou, P., Evangelidis, D., Papanikolaou, D., Lampridou, D., Litsas, D., Tsaparas, Y., and Koliopanos, I. (2021). Morphotectonic Analysis along the Northern Margin of Samos Island, Related to the Seismic Activity of October 2020, Aegean Sea, Greece. Geosciences, 11.","DOI":"10.5194\/egusphere-egu21-3849"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"106","DOI":"10.1016\/j.tecto.2012.11.026","article-title":"Active faulting in the north-eastern Aegean Sea Islands","volume":"597\u2013598","author":"Chatzipetros","year":"2013","journal-title":"Tectonophysics"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"193","DOI":"10.1017\/S0016756812000453","article-title":"Is there a link between faulting and magmatism in the south-central Aegean Sea?","volume":"150","author":"Kokkalas","year":"2013","journal-title":"Geol. Mag."},{"key":"ref_17","first-page":"374","article-title":"Plio-quaternary extension and strike-slip tectonics in the Aegean","volume":"339","author":"Sakellariou","year":"2018","journal-title":"Transform. Plate Boundaries Fract. Zones"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Kassaras, I., Kapetanidis, V., Ganas, A., Tzanis, A., Kosma, C., Karakonstantis, A., Valkaniotis, S., Chailas, S., Kouskouna, V., and Papadimitriou, P. (2020). The New Seismotectonic Atlas of Greece (v1.0) and Its Implementation. Geosciences, 10.","DOI":"10.5194\/egusphere-egu2020-2220"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1016\/j.jog.2018.01.009","article-title":"The 12th June 2017 Mw=6.3 Lesvos earthquake from detailed seismological observations","volume":"115","author":"Papadimitriou","year":"2018","journal-title":"J. Geodyn."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"4177","DOI":"10.1007\/s00024-019-02154-y","article-title":"The July 20, 2017 M6.6 Kos Earthquake: Seismic and Geodetic Evidence for an Active North-Dipping Normal Fault at the Western End of the Gulf of G\u00f6kova (SE Aegean Sea)","volume":"176","author":"Ganas","year":"2019","journal-title":"Pure Appl. Geophys."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"184","DOI":"10.1016\/j.tecto.2015.01.010","article-title":"Fault modelling of the early-2014 ~M6 Earthquakes in Cephalonia Island (W. Greece) based on GPS measurements","volume":"644","author":"Sakkas","year":"2015","journal-title":"Tectonophysics"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1016\/j.tecto.2013.03.012","article-title":"SqueeSAR\u2122 and GPS ground deformation monitoring of Santorini Volcano (1992\u20132012): Tectonic implications","volume":"594","author":"Lagios","year":"2013","journal-title":"Tectonophysics"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"43","DOI":"10.1016\/j.tecto.2011.12.015","article-title":"Combined Seismicity Pattern Analysis, DGPS and PSInSAR studies in the broader area of Cephalonia (Greece)","volume":"524\u2013525","author":"Lagios","year":"2012","journal-title":"Tectonophysics"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"251","DOI":"10.12681\/bgsg.25359","article-title":"First Results on the Mw = 6.9 Samos Earthquake of 30 October 2020","volume":"56","author":"Papadimitriou","year":"2020","journal-title":"Bull. Geol. Soc. Greece"},{"key":"ref_25","unstructured":"(2021, April 23). Greece Earthquake Catalogue Search. Available online: http:\/\/www.geophysics.geol.uoa.gr."},{"key":"ref_26","unstructured":"(2021, April 23). Geodynamics Institute of the National Observatory of Athens (GI-NOA). Available online: www.gein.noa.gr."},{"key":"ref_27","unstructured":"(2021, April 23). Turkish Disaster and Emergency Management Presidency AFAD, Available online: https:\/\/deprem.afad.gov.tr."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Klein, F.W. (2002). User\u2019s guide to HYPOINVERSE-2000: A Fortran program to solve for earthquake locations and magnitudes. U.S. Geol. Surv. Prof. Pap, 1\u2013123.","DOI":"10.3133\/ofr02171"},{"key":"ref_29","unstructured":"Karakonstantis, A. (2017). 3-D simulation of Crust and Upper Mantle Structure in the Broader Hellenic Area through Seismic Tomography. [Ph.D. Thesis, National and Kapodistrian University of Athens]."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Waldhauser, F. (2001). HypoDD-A Program to Compute Double-Difference Hypocenter Locations. U.S. Geol. Surv. Open File Rep., 25.","DOI":"10.3133\/ofr01113"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Caporali, A., Floris, M., Chen, X., Nurce, B., Bertocco, M., and Zurutuza, J. (2020). The November 2019 seismic sequence in Albania: Geodetic constraints and fault interaction. Remote Sens., 12.","DOI":"10.3390\/rs12050846"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"He, Z., Chen, T., Wang, M., and Li, Y. (2020). Multi-segment rupture model of the 2016 Kumamoto earthquake revealed by InSAR and GPS data. Remote Sens., 12.","DOI":"10.3390\/rs12223721"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"461","DOI":"10.1093\/gji\/ggz461","article-title":"Tectonic Deformation in the Santorini Volcanic Complex (Greece) as inferred by joint analysis of Gravity, Magnetotelluric and DGPS Observations","volume":"220","author":"Tzanis","year":"2020","journal-title":"Geophys. J. Int."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Boixart, G., Cruz, L.F., Cruz, R.M., Euillades, P.A., Euillades, L.D., and Battaglia, M. (2020). Source model for Sabancaya Volcano constrained by DInSAR and GNSS surface deformation observation. Remote Sens., 12.","DOI":"10.3390\/rs12111852"},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Gatsios, T., Cigna, F., Tapete, D., Sakkas, V., Pavlou, K., and Parcharidis, I. (2020). Copernicus sentinel-1 MT-InSAR, GNSS and seismic monitoring of deformation patterns and trends at the Methana Volcano, Greece. Appl. Sci., 10.","DOI":"10.3390\/app10186445"},{"key":"ref_36","unstructured":"(2021, April 23). HexagonSmartNet METRICA S.A.. Available online: https:\/\/hxgnsmartnet.com."},{"key":"ref_37","unstructured":"(2021, April 23). URANUS Net. Available online: http:\/\/www.uranus.gr."},{"key":"ref_38","unstructured":"Onder Cetin, K., Mylonakis, G., Sextos, A., and Stewart, J.P. (2020). Seismological and Engineering Effects of the M 7.0 Samos Island (Aegean Sea) Earthquake, Hellenic Association of Earthquake Engineering."},{"key":"ref_39","first-page":"1","article-title":"The October 30, 2020, Mw 6.9 Samos (Greece) earthquake","volume":"21","author":"Lekkas","year":"2020","journal-title":"Newsl. Environ. Disaster Cris. Manag. Strateg."},{"key":"ref_40","unstructured":"(2021, April 23). EUREF Permanent GNSS Network\u2013Station Log. Available online: https:\/\/www.epncb.oma.be\/ftp\/station\/log_9char\/izmi00tur_20201111.log."},{"key":"ref_41","unstructured":"Dach, R., Lutz, S., Walser, P., and Fridez, P. (2015). Bernese GNSS Software Version 5.2, Astronomical Institute, University of Bern, Bern Open Publishing. User Manual."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"220","DOI":"10.1016\/j.tecto.2012.03.037","article-title":"Present-day kinematics of the Mediterranean: A comprehensive overview of GPS results","volume":"579","author":"Nocquet","year":"2012","journal-title":"Tectonophysics"},{"key":"ref_43","first-page":"69","article-title":"Strain rate analysis over the central Apennines from GPS velocities: The development of a new free software","volume":"56","author":"Pesci","year":"2007","journal-title":"Boll. Di Geod. E Sci. Affin."},{"key":"ref_44","doi-asserted-by":"crossref","unstructured":"Hanssen, R.F. (2001). Radar Interferometry: Data Interpretation and Error Analysis, Kluwer Academic Publishers.","DOI":"10.1007\/0-306-47633-9"},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Comerci, V., and Vittori, E. (2019). The Need for a Standardized Methodology for Quantitative Assessment of Natural and Anthropogenic Land Subsidence: The Agosta (Italy) Gas Field Case. Remote Sens., 11.","DOI":"10.3390\/rs11101178"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"54","DOI":"10.1080\/22797254.2019.1663710","article-title":"A procedure to use GNSS data to calibrate satellite PSI data for the study of subsidence: An example from the north-western Adriatic coast (Italy)","volume":"52","author":"Farolfi","year":"2019","journal-title":"Eur. J. Remote Sens."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"319","DOI":"10.1109\/TGRS.2018.2854371","article-title":"Integration of GNSS and Satellite InSAR Data: Derivation of Fine-Scale Vertical Surface Motion Maps of Po Plain, Northern Apennines, and Southern Alps, Italy","volume":"57","author":"Farolfi","year":"2019","journal-title":"IEEE Trans. Geosci. Remote. Sens."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"9542","DOI":"10.3390\/rs70809542","article-title":"Extracting vertical displacement rates in Shanghai (China) with multi-platform SAR images","volume":"7","author":"Dai","year":"2015","journal-title":"Remote Sens."},{"key":"ref_49","doi-asserted-by":"crossref","unstructured":"Fuhrmann, T., and Garthwaite, M.C. (2019). Resolving three-dimensional surface motion with InSAR: Constraints from multi-geometry data fusion. Remote Sens., 11.","DOI":"10.3390\/rs11030241"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"L16307","DOI":"10.1029\/2009GL039496","article-title":"Slip distribution from the 1 April 2007 Solomon Islands earthquake: A unique image of near-trench rupture","volume":"36","author":"Chen","year":"2009","journal-title":"Geophys. Res. Lett."},{"key":"ref_51","first-page":"B06407","article-title":"Active deformation near the Nicoya Peninsula, northwestern Costa Rica, between 1996 and 2010: Interseismic megathrust coupling","volume":"117","author":"Feng","year":"2012","journal-title":"J. Geophys. Res."},{"key":"ref_52","unstructured":"(2021, March 08). GTdef. Available online: https:\/\/avnewman.github.io\/GTDef\/."},{"key":"ref_53","doi-asserted-by":"crossref","unstructured":"Valkaniotis, S., Briole, P., Ganas, A., Elias, P., Kapetanidis, V., Tsironi, V., Fokaefs, A., Partheniou, H., and Paschos, P. (2020). The Mw = 5.6 Kanallaki earthquake of 21 March 2020 in west Epirus, Greece: Reverse fault model from InSAR data and seismotectonic implications for Apulia-Eurasia collision. Geosciences, 10.","DOI":"10.20944\/preprints202008.0590.v1"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"2225","DOI":"10.1785\/0120170017","article-title":"New empirical earthquake source-scaling laws","volume":"107","author":"Thingbaijam","year":"2017","journal-title":"Bull. Seismol. Soc. Am."},{"key":"ref_55","doi-asserted-by":"crossref","unstructured":"Triantafyllou, I., Gogou, M., Mavroulis, S., Lekkas, E., Papadopoulos, G.A., and Thravalos, M. (2021). The Tsunami Caused by the 30 October 2020 Samos (Aegean Sea) Mw7.0 Earthquake: Hydrodynamic Features, Source Properties and Impact Assessment from Post-Event Field Survey and Video Records. J. Mar. Sci. Eng., 9.","DOI":"10.3390\/jmse9010068"},{"key":"ref_56","unstructured":"(2021, April 23). USGS Earthquakes Hazards Program, Available online: https:\/\/earthquake.usgs.gov\/earthquakes\/."},{"key":"ref_57","unstructured":"(2021, April 23). GFZ GEOFON. Available online: http:\/\/geofon.gfz-potsdam.de\/eqinfo\/."},{"key":"ref_58","unstructured":"(2021, April 23). Global CMT Web Page. Available online: https:\/\/www.globalcmt.org."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"974","DOI":"10.1785\/BSSA0840040974","article-title":"New empirical relationships among magnitude, rupture length, rupture area and surface displacement","volume":"84","author":"Wells","year":"1994","journal-title":"Bull. Seismol. Soc. Am."},{"key":"ref_60","doi-asserted-by":"crossref","unstructured":"Evelpidou, N., Karkani, A., and Kampolis, I. (2021). Relative Sea Level Changes and Morphotectonic Implications Triggered by the Samos Earthquake of 30th October 2020. J. Mar. Sci. Eng., 9.","DOI":"10.3390\/jmse9010040"},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"1753","DOI":"10.1093\/gji\/ggaa412","article-title":"Broad-band ground-motion simulation of 2016 Amatrice earthquake, Central Italy","volume":"224","author":"Pischiutta","year":"2021","journal-title":"Geophys. J. Int."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"409","DOI":"10.1002\/2013EO450001","article-title":"Generic Mapping Tools: Improved Version Released","volume":"94","author":"Wessel","year":"2013","journal-title":"Eos Trans. Agu"},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"5005","DOI":"10.1029\/96JB03860","article-title":"Precise point positioning for the efficient and robust analysis of GPS data from large networks","volume":"102","author":"Zumberge","year":"1997","journal-title":"J. Geophys. Res."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"8701","DOI":"10.1002\/2015JB012023","article-title":"Insights on continental collisional processes from GPS data: Dynamics of the peri-Adriatic belts","volume":"120","author":"Avallone","year":"2015","journal-title":"J. Geophys. Res. Solid Earth"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1007\/s10291-017-0675-9","article-title":"Atmospheric opacity estimation based on IWV derived from GNSS observations for VLBI applications","volume":"22","author":"Nykiel","year":"2018","journal-title":"Gps Solut."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/9\/1665\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T05:52:24Z","timestamp":1760161944000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/9\/1665"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,4,24]]},"references-count":65,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2021,5]]}},"alternative-id":["rs13091665"],"URL":"https:\/\/doi.org\/10.3390\/rs13091665","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,4,24]]}}}