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- W2006832114 abstract "The elastic structure beneath Antarctica is shown by means of S-velocity maps for depths ranging from zero to 400 km, determined by the regionalization and inversion of Rayleigh-wave dispersion. The traces of 93 earthquakes, occurring from 1990 to 2011, have been used to obtain Rayleigh-wave dispersion data. These earthquakes were registered by 30 seismic stations located in Antarctica. The dispersion curves were obtained for periods between 5 and 250 s, by digital filtering with a combination of MFT and TVF filtering techniques. Later, all seismic events (and some stations) were grouped to obtain a dispersion curve for each source-station path. These dispersion curves were regionalized and inverted according to the generalized inversion theory, to obtain shear-wave velocity models for a rectangular grid of 20 × 20 points. The shear-velocity structure obtained through this procedure is shown in the S-velocity maps plotted for several depths. These results agree well with the geology and other geophysical results previously obtained. The obtained S-velocity models suggest the existence of lateral and vertical heterogeneities. The zones with consolidated and old structures present greater S-velocity values than the other zones, although this difference can be very little or negligible in some case. Nevertheless, in the depth range of 10 to 45 km, the different Moho depths present in the study area generate the principal variation of S-velocity. A similar behaviour is found for the depth range from 80 to 230 km, in which the lithosphere–asthenosphere boundary generates the principal variations of S-velocity. Finally, a new and interesting feature obtained in this study should be highlighted: the definition of the LAB and the base of the asthenosphere (for the whole study area), for depths ranging from 80 to 230 km and from 180 to 280 km, respectively." @default.
- W2006832114 created "2016-06-24" @default.
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- W2006832114 date "2013-01-01" @default.
- W2006832114 modified "2023-09-23" @default.
- W2006832114 title "Shear-wave velocity structure of Antarctica from Rayleigh-wave analysis" @default.
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- W2006832114 doi "https://doi.org/10.1016/j.tecto.2012.10.013" @default.
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