{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,5]],"date-time":"2026-01-05T04:05:45Z","timestamp":1767585945279,"version":"build-2065373602"},"reference-count":47,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2021,5,19]],"date-time":"2021-05-19T00:00:00Z","timestamp":1621382400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004271","name":"Sapienza Universit\u00e0 di Roma","doi-asserted-by":"publisher","award":["Piccoli Progetti Universitari 2015 e 2020"],"award-info":[{"award-number":["Piccoli Progetti Universitari 2015 e 2020"]}],"id":[{"id":"10.13039\/501100004271","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>In this work, we study the subsidence of Dallol, an explosive crater and hydrothermal area along the spreading Erta Ale ridge of Afar (Ethiopia). No volcanic products exist at the surface. However, a diking episode in 2004, accompanied by dike-induced faulting, indicates that Dallol is an active volcanic area. The 2004 diking episode was followed by quiescence until subsidence started in 2008. We use InSAR to measure the deformation, and inverse, thermoelastic and poroelastic modelling to understand the possible causes of the subsidence. Analysis of InSAR data from 2004\u20132010 shows that subsidence, centered at Dallol, initiated in October 2008, and continued at least until February 2010 at an approximately regular rate of up to 10 cm\/year. The inversion of InSAR average velocities finds that the source causing the subsidence is shallow (depth between 0.5 and 1.5 km), located under Dallol and with a volume decrease between \u22120.63 and \u22120.26 \u00d7 106 km3\/year. The most likely explanation for the subsidence of Dallol volcano is a combination of outgassing (depressurization), cooling and contraction of the roof of a shallow crustal magma chamber or of the hydrothermal system.<\/jats:p>","DOI":"10.3390\/rs13101991","type":"journal-article","created":{"date-parts":[[2021,5,19]],"date-time":"2021-05-19T21:49:21Z","timestamp":1621460961000},"page":"1991","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["The 2008\u20132010 Subsidence of Dallol Volcano on the Spreading Erta Ale Ridge: InSAR Observations and Source Models"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4726-5287","authenticated-orcid":false,"given":"Maurizio","family":"Battaglia","sequence":"first","affiliation":[{"name":"Department of Earth Sciences, Sapienza University of Rome, 00185 Rome, Italy"},{"name":"U.S. Geological Survey, Volcano Disaster Assistance Program, Moffet Field, Mountain View, CA 94035, USA"}]},{"given":"Carolina","family":"Pagli","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, University of Pisa, 56126 Pisa, Italy"}]},{"given":"Stefano","family":"Meuti","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, Sapienza University of Rome, 00185 Rome, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Lu, Z., Dzurisin, D., Biggs, J., Wicks, C., and McNutt, S. (2010). Ground surface deformation patterns, magma supply, and magma storage at Okmok volcano, Alaska, from InSAR analysis: 1. Interruption deformation, 1997\u20132008. J. Geophys. Res., 115.","DOI":"10.1029\/2009JB006969"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Segall, P. (2010). Earthquake and Volcano Deformation, Princeton University Press.","DOI":"10.1515\/9781400833856"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"18212","DOI":"10.1038\/srep18212","article-title":"Degassing during quiescence as a trigger of magma ascent and volcanic eruptions","volume":"5","author":"Girona","year":"2015","journal-title":"Sci. Rep."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1186\/s40645-018-0186-5","article-title":"What causes subsidence following the 2011 eruption at Nabro (Eritrea)?","volume":"5","author":"Hamlyn","year":"2018","journal-title":"Prog. Earth Planet Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"19355","DOI":"10.1029\/2001JB000194","article-title":"Modeling surface deformation observed with synthetic aperture radar interferometry at Campi Flegrei caldera","volume":"106","author":"Lundgren","year":"2001","journal-title":"J. Geophys. Res."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"132","DOI":"10.1016\/j.jvolgeores.2005.07.002","article-title":"Unrest at the Campi Flegrei caldera (Italy): A critical evaluation of source parameters from geodetic data inversion","volume":"150","author":"Gottsmann","year":"2006","journal-title":"J. Volcanol. Geotherm. Res."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Fournier, T.J., Pritchard, M.E., and Riddick, S.N. (2010). Duration, magnitude, and frequency of subaerial volcano deformation events: New results from Latin America using InSAR and a global synthesis. Geochem. Geophys. Geosyst., 11.","DOI":"10.1029\/2009GC002558"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"979","DOI":"10.1130\/G30133A.1","article-title":"Multiple inflation and deflation events at Kenyan volcanoes. East African Rift","volume":"37","author":"Biggs","year":"2009","journal-title":"Geology"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1016\/j.jvolgeores.2005.09.014","article-title":"Deformation of the Askja volcanic system: Constraints on the deformation source from combined inversion of satellite radar interferograms and GPS measurements","volume":"152","author":"Pagli","year":"2006","journal-title":"J. Volcanol. Geotherm. Res."},{"key":"ref_10","first-page":"72","article-title":"Subsidence of Askja caldera 2000\u20132009: Modelling of deformation processes at an extensional plate boundary, constrained by time series InSAR analysis","volume":"213","author":"Pedersen","year":"2021","journal-title":"J. Volcanol. Geotherm. Res."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"2627","DOI":"10.1002\/2014JB011502","article-title":"Magma and fluid migration at Yellowstone Caldera in the last three decades inferred from InSAR, leveling, and gravity measurements","volume":"120","author":"Tizzani","year":"2015","journal-title":"J. Geophys. Res."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"108","DOI":"10.1016\/j.earscirev.2018.11.007","article-title":"The Campi Flegrei caldera unrest: Discriminating magma intrusions from hydrothermal effects and implications for possible evolution","volume":"188","author":"Troise","year":"2019","journal-title":"Earth-Sci. Rev."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"409","DOI":"10.1016\/j.epsl.2010.02.010","article-title":"Recent rift-related volcanism in Afar, Ethiopia","volume":"292","author":"Ferguson","year":"2010","journal-title":"Earth Planet. Sc. Lett."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"2848","DOI":"10.1029\/2017TC004798","article-title":"The development of late-stage continental breakup: Seismic reflection and borehole evidence from the Danakil Depression, Ethiopia","volume":"37","author":"Bastow","year":"2018","journal-title":"Tectonics"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"L19305","DOI":"10.1029\/2012GL053152","article-title":"Dike-fault interaction during the 2004 Dallol intrusion at the northern edge of the Erta Ale Ridge (Afar, Ethiopia)","volume":"39","author":"Nobile","year":"2012","journal-title":"Geophys. Res. Lett."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"8562","DOI":"10.1002\/2014JB011391","article-title":"Current plate boundary deformation of the Afar rift from a 3-D velocity field inversion of InSAR and GPS","volume":"119","author":"Pagli","year":"2014","journal-title":"J. Geophys. Res."},{"key":"ref_17","first-page":"L07303","article-title":"Satellite geodetic imaging reveals internal deformation of western Tibet","volume":"39","author":"Wang","year":"2012","journal-title":"Geophys. Res. Lett."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1165","DOI":"10.1111\/j.1365-246X.2007.03415.x","article-title":"Multi-interferogram method for measuring interseismic deformation: Denali fault, Alaska","volume":"170","author":"Biggs","year":"2007","journal-title":"Geophys. J. Int."},{"key":"ref_19","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"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2345","DOI":"10.1002\/2017JB014902","article-title":"Seismicity during continental breakup in the Red Sea rift of Northern Afar","volume":"123","author":"Keir","year":"2018","journal-title":"J. Geophys. Res."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1029\/2004EO050004","article-title":"Updated repeat orbit interferometry package released","volume":"85","author":"Rosen","year":"2004","journal-title":"Eos Trans. AGU"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"L12309","DOI":"10.1029\/2008GL033659","article-title":"InSAR slip rate determination on the Altyn Tagh Fault, northern Tibet, in the presence of topographically correlated atmospheric delays","volume":"35","author":"Elliott","year":"2008","journal-title":"Geophys. Res. Lett."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Ng, A.H.-M., Wang, H., Dai, Y., Pagli, C., Chen, W., Ge, L., Du, Z., and Zhang, K. (2018). InSAR Reveals Land Deformation at Guangzhou and Foshan, China between 2011 and 2017 with COSMO-SkyMed Data. Remote Sens., 10.","DOI":"10.3390\/rs10060813"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"332","DOI":"10.1109\/TGRS.2006.887163","article-title":"Analysis of the Backscattering Coefficient of Salt-Affected Soils Using Modeling and RADARSAT-1 SAR Data","volume":"45","author":"Aly","year":"2007","journal-title":"IEEE Trans. Geosci. Remote"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.jvolgeores.2012.12.018","article-title":"dMODELS: A MATLAB software package for modeling crustal deformation near active faults and volcanic centers","volume":"254","author":"Battaglia","year":"2013","journal-title":"J. Volcanol. Geotherm. Res."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"12931","DOI":"10.1029\/JB092iB12p12931","article-title":"Elastic stress and deformation near a finite spherical magma body: Resolution of the point source paradox","volume":"92","author":"McTigue","year":"1987","journal-title":"J. Geophys. Res."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1549","DOI":"10.1029\/98GL01136","article-title":"The effects of topography on magma chamber deformation models: Application to Mt. Etna and radar interferometry","volume":"25","author":"Williams","year":"1998","journal-title":"Geophys. Res. Lett."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"4249","DOI":"10.1029\/JB093iB05p04249","article-title":"Deformation from inflation of a dipping finite prolate spheroid in an elastic half-space as a model for volcanic stressing","volume":"93","author":"Yang","year":"1988","journal-title":"J. Geophys. Res."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"181","DOI":"10.1046\/j.1365-246X.2001.00452.x","article-title":"Deformation due to a pressurized horizontal circular crack in an elastic half-space, with applications to volcano geodesy","volume":"146","author":"Fialko","year":"2001","journal-title":"Geophys. J. Int."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1135","DOI":"10.1785\/BSSA0750041135","article-title":"Surface deformation due to shear and tensile faults in a half-space","volume":"75","author":"Okada","year":"1985","journal-title":"Bull. Seismol. Soc. Am."},{"key":"ref_31","first-page":"281","article-title":"Random search for hyper-parameter optimization","volume":"13","author":"Bergstra","year":"2012","journal-title":"J. Mach. Learn. Res."},{"key":"ref_32","unstructured":"Mathworks (2021, May 17). Optimization Toolbox\u2122 User\u2019s Guide (R2020b). Available online: www.mathworks.com."},{"key":"ref_33","unstructured":"Meyers, R.A. (2003). Geostatics. Encyclopedia of Physical Science and Technology, Academic Press. [3rd ed.]."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"587","DOI":"10.1029\/GL014i006p00587","article-title":"Statistical tests for closure of plate motion circuits","volume":"14","author":"Gordon","year":"1987","journal-title":"Geophys. Res. Lett."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"812","DOI":"10.1016\/j.jafrearsci.2010.02.005","article-title":"A geophysical multi-parametric analysis of hydrothermal activity at Dallol, Ethiopia","volume":"58","author":"Carniel","year":"2010","journal-title":"J. Afr. Earth Sci."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"553","DOI":"10.1089\/ast.2018.1926","article-title":"The Dallol Geothermal Area, Northern Afar (Ethiopia)\u2014An Exceptional Planetary Field Analog on Earth","volume":"19","author":"Cavalazzi","year":"2019","journal-title":"Astrobiology"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"122","DOI":"10.1093\/gji\/ggz011","article-title":"The effect of fluid compressibility and elastic rock properties on deformation of geothermal reservoirs","volume":"217","author":"Juncu","year":"2019","journal-title":"Geophys. J. Int."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"B01401","DOI":"10.1029\/2003JB002568","article-title":"Transient volcano deformation sources imaged with interferometric synthetic aperture radar: Application to Seguam Island, Alaska","volume":"109","author":"Masterlark","year":"2004","journal-title":"J. Geophys. Res."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"B04411","DOI":"10.1029\/2008JB006151","article-title":"Numerical models of caldera deformation: Effects of multiphase and multicomponent hydrothermal fluid flow","volume":"114","author":"Hutnak","year":"2009","journal-title":"J. Geophys. Res."},{"key":"ref_40","first-page":"EGU2017","article-title":"Subsidence at Dallol proto-volcano, Afar (Ethiopia): Cooling of the magma chamber or deep interconnection?","volume":"19","author":"Meuti","year":"2017","journal-title":"Geophys. Res. Abs"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"e2020GC009488","DOI":"10.1029\/2020GC009488","article-title":"Magmatic Processes in the East African Rift System: Insights From a 2015\u20132020 Sentinel-1 InSAR Survey","volume":"22","author":"Albino","year":"2020","journal-title":"Geochem. Geophys. Geosyst."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1807","DOI":"10.1029\/91JB02839","article-title":"Dynamics of magma storage in the summit reservoir of Kilauea Volcano, Hawaii","volume":"97","author":"Johnson","year":"1992","journal-title":"J. Geophys. Res."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"491","DOI":"10.1007\/s004450050006","article-title":"Comment on \u201cVolume of magma accumulation or withdrawal estimated from surface uplift or subsidence, with application to the 1960 collapse of K\u012blauea volcano\u201d by P. T. Delaney and D. F. McTigue","volume":"61","author":"Johnson","year":"2000","journal-title":"Bull. Volcanol."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"L04306","DOI":"10.1029\/2007GL032521","article-title":"Magma compressibility and the missing source for some dike intrusions","volume":"35","author":"Rivalta","year":"2008","journal-title":"Geophys. Res. Lett."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"e2019GC008904","DOI":"10.1029\/2019GC008904","article-title":"Volatile-rich magmas distributed through the upper crust in the Main Ethiopian Rift","volume":"21","author":"Iddon","year":"2020","journal-title":"Geochem. Geophys. Geosyst."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"2372","DOI":"10.1029\/2001JB000893","article-title":"Steady subsidence of Medicine Lake Volcano, Northern California, revealed by repeated leveling surveys","volume":"107","author":"Dzurisin","year":"2002","journal-title":"J. Geophys. Res."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"e2019JB018208","DOI":"10.1029\/2019JB018208","article-title":"Magma intrusion and volatile ascent beneath Norris Geyser Basin, Yellowstone National Park","volume":"125","author":"Wicks","year":"2020","journal-title":"J. Geophys. Res."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/10\/1991\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:04:15Z","timestamp":1760162655000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/10\/1991"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,5,19]]},"references-count":47,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2021,5]]}},"alternative-id":["rs13101991"],"URL":"https:\/\/doi.org\/10.3390\/rs13101991","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2021,5,19]]}}}