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The velocity models are inferred from the dispersion of surface waves recorded on ocean bottom seismometers. Dispersion measurements are obtained from the analysis of ambient seismic noise at short periods (&amp;lt; 14\u00a0s) and teleseismic surface waves at long periods (&amp;gt; 14\u00a0s) using the two-station method. The 1-D Vs model is inferred from the joint inversion of Rayleigh wave phase velocities and Love wave group and phase velocities. The 3-D tomographic model is obtained by inversion of 2-D Love wave group velocity maps as a function of depth, further constrained by the average of Love wave phase velocities obtained from ambient noise (4\u20139\u00a0s) and the average Rayleigh and Love wave phase velocities calculated from teleseismic data (14\u201344\u00a0s).<\/jats:p>\n               <jats:p>The 1-D Vs model shows a sediment layer with a low velocity of 1.05\u00a0km\u2009s\u22121, similar to previous studies in the region. Below the sediments, we find an oceanic crust with velocities ranging from 3.3 to 4.5\u2009km\u2009s\u22121. The model reaches an unusually high velocity of 4.9\u2009km\u2009s\u22121 in a 20\u00a0km thick layer at depths between 16 and 36\u00a0km. We interpret this fast velocity layer as indicative of the presence of harzburgite, a residue of enhanced melting that might have been formed by the proximity between the Mid-Atlantic Ridge and the Azores mantle plume. At greater depths the velocity decreases, forming a low-velocity zone that reaches a minimum at \u223c 70\u00a0km depth, which we interpret as the maximum depth for the lithosphere\u2013asthenosphere boundary. The 3-D model shows a structure that is mostly horizontally layered, with Vs isocontours at 3.5\u20134.5\u2009km\u2009s\u22121 highlighting oscillations of the crustal structure with wavelengths of \u223c25\u201330\u00a0km. These oscillations may be due to changes in the rate of mantle upwelling and magma supply rate.<\/jats:p>","DOI":"10.1093\/gji\/ggad405","type":"journal-article","created":{"date-parts":[[2023,10,20]],"date-time":"2023-10-20T03:56:35Z","timestamp":1697774195000},"page":"1-13","source":"Crossref","is-referenced-by-count":1,"title":["Crustal and uppermost mantle structure near the Gloria Fault, North Atlantic, from ocean bottom seismometer surface wave observations"],"prefix":"10.1093","volume":"236","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3807-8068","authenticated-orcid":false,"given":"Juan I","family":"Pinz\u00f3n","sequence":"first","affiliation":[{"name":"Instituto Dom Luiz (IDL), Faculdade de Ci\u00eancias, Universidade de Lisboa , Lisbon, 45158 , Portugal"}]},{"given":"Susana","family":"Cust\u00f3dio","sequence":"additional","affiliation":[{"name":"Instituto Dom Luiz (IDL), Faculdade de Ci\u00eancias, Universidade de Lisboa , Lisbon, 45158 , Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2110-2554","authenticated-orcid":false,"given":"Gra\u00e7a","family":"Silveira","sequence":"additional","affiliation":[{"name":"Instituto Dom Luiz (IDL), Faculdade de Ci\u00eancias, Universidade de Lisboa , Lisbon, 45158 , Portugal"},{"name":"Departamento de F\u00edsica, Instituto Superior de Engenharia de Lisboa (ISEL) , Lisbon, 1959-007 , Portugal"}]},{"given":"Frank","family":"Kr\u00fcger","sequence":"additional","affiliation":[{"name":"Institute of Geosciences, University of Potsdam , Potsdam, 14476 , Germany"}]},{"given":"Jo\u00e3o","family":"Mata","sequence":"additional","affiliation":[{"name":"Instituto Dom Luiz (IDL), Faculdade de Ci\u00eancias, Universidade de Lisboa , Lisbon, 45158 , Portugal"}]},{"given":"Luis","family":"Matias","sequence":"additional","affiliation":[{"name":"Instituto Dom Luiz (IDL), Faculdade de Ci\u00eancias, Universidade de Lisboa , Lisbon, 45158 , Portugal"}]}],"member":"286","published-online":{"date-parts":[[2023,10,19]]},"reference":[{"issue":"13","key":"2023110801341447300_bib1","doi-asserted-by":"publisher","first-page":"2811","DOI":"10.1016\/0016-7037(94)90116-3","article-title":"Determining the composition of high-pressure mantle melts using diamond aggregates","volume":"58","author":"Baker","year":"1994","journal-title":"Geochim. 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