Melt in the mantle and seismic azimuthal anisotropy: evidence from Anatolia

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dc.contributor.authorVinnik, Lev
dc.contributor.authorOreshin, Sergey
dc.contributor.authorErduran, Murat
dc.date.accessioned2025-01-27T20:49:48Z
dc.date.available2025-01-27T20:49:48Z
dc.date.issued2016
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractObservations of shear wave splitting in SKS seismic phase play a key role in the current efforts to understand kinematics and dynamics of mantle flow, but azimuthal anisotropy as a depth-localized phenomenon still is poorly known. Here we analyse stratification of seismic azimuthal anisotropy beneath central and northern Anatolia (a microplate within the Alpine belt) by inverting P-wave receiver functions jointly with shear wave splitting in SKS seismic phase. The analysis is based on recordings of stations of the North Anatolian Fault (NAF) passive seismic experiment. In the resulting model in a depth interval from 120 to 200 km fast direction of anisotropy is nearly parallel to the plate motion direction (similar to E-W), whilst a normal direction (close to S-N) is found in the low velocity zone (LVZ) between 60 and 90 km. Our preferred interpretation of these data suggests that the flow in upper mantle is nearly parallel to the Anatolian plate motion direction in the depth range from the LAB to 200 km, but in part of the LVZ fast direction of anisotropy is normal to the direction of shear in the mantle. This relation between anisotropy and shear is known from laboratory experiments with peridotite-type rock containing melt. A similar relation between anisotropy and flow in the LVZ is found in Fennoscandia. These findings may have far-reaching implications for interpreting mantle anisotropy elsewhere.
dc.description.sponsorshipNational Scientific and Research Council of Turkey (TUBITAK) [111Y190]; Russian Fund for Basic Research (RFBR) [12-05-91373-CT_a]
dc.description.sponsorshipThis study was supported by the National Scientific and Research Council of Turkey (TUBITAK, grant No111Y190) and by the Russian Fund for Basic Research (RFBR, grant No12-05-91373-CT_a). The recordings of the NAF array were obtained from the IRIS DMC. Seismic recordings were processed with Seismic Handler (Stammler 1993). Plots were generated with Generic Mapping Tool (Wessel & Smith 1995). We thank S. Beck for solving some problems with the NAF recordings and two anonymous reviewers for thoughtful comments.
dc.identifier.doi10.1093/gji/ggw021
dc.identifier.endpage530
dc.identifier.issn0956-540X
dc.identifier.issn1365-246X
dc.identifier.issue1
dc.identifier.scopus2-s2.0-84962847050
dc.identifier.scopusqualityQ1
dc.identifier.startpage523
dc.identifier.urihttps://doi.org/10.1093/gji/ggw021
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25316
dc.identifier.volume205
dc.identifier.wosWOS:000374479800037
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOxford Univ Press
dc.relation.ispartofGeophysical Journal International
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectBody waves
dc.subjectSeismic anisotropy
dc.subjectDynamics of lithosphere and mantle
dc.titleMelt in the mantle and seismic azimuthal anisotropy: evidence from Anatolia
dc.typeArticle

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