{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T12:52:29Z","timestamp":1747227149648,"version":"3.40.5"},"posted":{"date-parts":[[2020,3,23]]},"group-title":"oral","reference-count":0,"publisher":"Copernicus GmbH","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>\n        &amp;lt;p&amp;gt;One of the aims of project SIGHT (SeIsmic and Geochemical constraints on the Madeira HoTspot system) is to obtain a 3D model of SV-wave velocities of the crust and upper mantle of the Northeast Atlantic area encompassing Madeira and Canary Islands to the Atlas-Gibraltar zone, using seismic noise cross-correlations in the period range 2-100 s. Ambient noise cross-correlation has been successfully applied in a variety of tectonic environments to image the structure of the Earth subsurface. This technique overcomes some limitations ascribed to source&amp;amp;#8211;receiver geometry and sparse and irregular earthquake distribution, allowing to image Earth structure with a resolution that mainly depends on the network design. However, the effect of the water layer in the short period Empirical Green Functions, which are obtained by seismic noise cross-correlation, for interstation paths crossing the ocean is still poorly understood.&amp;lt;\/p&amp;gt;&amp;lt;p&amp;gt;In several studies, it has been observed that the presence of water and sediments is responsible for later wave-train arrivals. Those later arrivals are frequently disregarded when measuring group velocity, either by considering only longer periods or by specifying a given velocity range.&amp;lt;\/p&amp;gt;&amp;lt;p&amp;gt;In this work, we present a systematic study of the influence of the water layer on both vertical and radial synthetic Rayleigh waves, as well as on higher-mode conversion and on the group velocities dispersion measurements.&amp;lt;\/p&amp;gt;&amp;lt;p&amp;gt;We show that although the fundamental mode dominates, the presence of the first overtones at short periods (typically below 8 seconds) cannot be neglected. We also show that specifying a given velocity range when retrieving group velocity can result in a mixture of modes. Our tests reveal that, at short periods, the water has a dominant effect on ocean-continent laterally varying media.&amp;lt;\/p&amp;gt;&amp;lt;p&amp;gt;This is a contribution to projects SIGHT (Ref. PTDC\/CTA-GEF\/30264\/2017) and STORM (Ref. UTAP-EXPL\/EAC\/0056\/2017). The authors would like to acknowledge the financial support FCT through project UIDB\/50019\/2020 &amp;amp;#8211; IDL.&amp;lt;\/p&amp;gt;\n        <\/jats:p>","DOI":"10.5194\/egusphere-egu2020-18561","type":"posted-content","created":{"date-parts":[[2020,3,10]],"date-time":"2020-03-10T03:48:21Z","timestamp":1583812101000},"source":"Crossref","is-referenced-by-count":0,"title":["Effect of the water layer on seismic noise cross-correlation across the Northeast Atlantic, from Madeira and Canaries to the Atlas-Gibraltar zone"],"prefix":"10.5194","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2110-2554","authenticated-orcid":false,"given":"Gra\u00e7a","family":"Silveira","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1077-8994","authenticated-orcid":false,"given":"Joana","family":"Carvalho","sequence":"additional","affiliation":[]},{"given":"Juan","family":"Pinzon","sequence":"additional","affiliation":[]},{"given":"Susana","family":"Cust\u00f3dio","sequence":"additional","affiliation":[]},{"given":"Carlos","family":"Corela","sequence":"additional","affiliation":[]},{"given":"Lu\u00eds","family":"Matias","sequence":"additional","affiliation":[]}],"member":"3145","container-title":[],"original-title":[],"deposited":{"date-parts":[[2020,3,23]],"date-time":"2020-03-23T19:29:08Z","timestamp":1584991748000},"score":1,"resource":{"primary":{"URL":"https:\/\/meetingorganizer.copernicus.org\/EGU2020\/EGU2020-18561.html"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,3,23]]},"references-count":0,"URL":"https:\/\/doi.org\/10.5194\/egusphere-egu2020-18561","relation":{},"subject":[],"published":{"date-parts":[[2020,3,23]]},"subtype":"other"}}