Abstract
During the Austral Summers 1993–94 and 1994–95, we operated two temporary seismic arrays in the Victoria Land region, Antarctica. The first was located around the Mt. Melbourne volcano, near Terra Nova Bay, and the second southward, along the ACRUP1 Geotraverse. The aim of these experiments was to provide additional constraints on the Moho geometry and on lithosphere-asthenosphere structure in this zone. For this reason, a number of techniques were applied to recorded teleseismic data. In this paper we describe the results of the analysis on SKS- and S-wave splitting, which show the presence of seismic anisotropy. Computed fast polarization directions range, on average, between 131° and 166°, and delay times are on the order of 1 s. We presume that anisotropy is mainly located in the upper mantle, although we cannot detect, at present, if a contribution from the crust does exist. The fast polarization direction we determine is quite parallel to the opening of the Ross Sea, an active rift system, but also to the Absolute Plate Motion direction. Therefore, we assume that the identified anisotropy may be induced by the extension, activated by plate motion and is still related to it.
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References
Barruol, G., and Kern, H. (1993), Seismic Anisotropy and Shear-wave Splitting in Lower Crust and Upper Mantle Rocks from the Ivrea Zone — Experimental and Calculated Data, Phys. Earth Planet. Inter. 95, 175–194.
Behrendt, J. C., LeMasurier, W. E., Cooper, A. K., Tessensohn, A., Trehu, A., and Damaske, D. (1991), Geophysical Studies of the West Antarctic Rift System, Tectonics 10, 1257–1253.
Cimini, G. B., Amato, A., Cerrone, M., Chiappini, M., Di Bona, M., and Pondrelli, S. (1995), Passive Seismological Studies in the Terra Nova Bay Area (Antarctica): First Results from the 1993-94 Expedition, Terra Antarctica 2, 81–94.
Cooper, A. K., Davey, F. J., and Hinz, K., Crustal extension and origin of sedimentary basins beneath the Ross Sea and the Ross Ice Shelf Antarctica. In Geological Evolution of Antarctica (eds. Thompson, M. R. A., Crame, J. A., and Thomson, J. W.) (Cambridge Univ. Press, Cambridge, New York 1989).
Crampin, S., and Booth, D. C. (1985), Shear-wave Polarizations near the North Anatolian Fault, II. Interpretation in Terms of Crack-induced Anisotropy, Geophys. J. R. Astron. Soc. 83, 75–92.
Della Vedova, B., Pellis, G., Trey, H., Zhang, J., Cooper, A. K., Makris, J., and ACRUP Working Group (1997), Crustal Structure of the Transantarctic Mountains, Western Ross Sea, I.S.A.E.S. 1995 Proceedings, Terra Antarctica, in press.
De Mets, C., Gordon, R. G., Argus, D. F., and Stein, S. (1990), Current Plate Motions, Geophys. J. Int. 101, 425–478.
Di Bona, M., Amato, A., Azzara, R., Cimini, G. B., Colombo, D., and Pondrelli, S. (1997), Constraints on the Lithospheric Structure beneath the Terra Nova Bay Area from Teleseismic P-to-S Conversions, I.S.A.E.S. 1995 Proceedings, Terra Antarctica, in press.
De Mets, C., Gordon, R. G., Argus, D. F., and Stein, S. (1990), Current Plate Motions, Geophys. J. Int. 101, 425–478.
Di Bona, M., Amato, A., Azzara, R., Cimini, G. B., Colombo, D., and Pondrelli, S. (1997), Constraints on the Lithospheric Structure beneath the Terra Nova Bay Area from Teleseismic P-to-S Conversions, I.S.A.E.S. 1995 Proceedings, Terra Antartctica, in press.
Gripp, A. E., and Gordon, R. G. (1990), Current Plate Velocities Relative to the Hot Spots Incorporating the NUVEL-1 Global Plate Motion Model, Geophys Res. Lett. 17, 1109–1112.
Helffrich, G., Silver, P., and Given, H. (1994), Shear-wave Splitting Variation over Short Spatial Scales on Continents, Geophys. J. Int. 119, 561–573.
Kubo, A., Hiramatsu, Y., and Kanao, M. (1996), Shear-wave Anisotropy by SKS Splitting in Antarctica, 30th International Geological Congress, Beijing, Abstract volume.
Mainprice, D., and Silver, P. G. (1993), Interpretation of SKS Waves Using Samples from the Subcontinental Lithosphere, Phys. Earth Planet. Int. 78, 257–80.
Mainprice, D., Silver, P. G., and Nicolas, A. (1993), Seismic Anisotropy in the Mantle from Petrofabrics, EOS, Trans. Am. Geophys. Union 74, 203.
Margheriti, L., Nostro, C., Cocco, M., and Amato, A. (1996), Seismic Anisotropy beneath the Northern Apennines (Italy) and its Tectonic Implications, Geophys. Res. Lett. 23, 2721–2724.
Nicolas, A., and Christensen, N. I., Formation of anisotropy in upper mantle peridotites—A review, In Composition, Structure and Dynamics of the Lithosphere-Asthenosphere System (eds. Fuchs, K., and Froidevauz, C.) (A. G. U., Washington D. C. 1987) pp. 111–123.
Plomerová, J., Sileny, J., and Babuška, V. (1996), Joint Interpretation of Upper Mantle Anisotropy Based on Teleseismic P-travel Time Delays and Inversion of Shear-wave Splitting Parameters, Phys. Earth Planet. Inter. 97, 293–309.
Pondrelli, S., Amato, A., Chiappini, M., Cimini, G. B., Colombo, D., and Di Bona, M. (1997), ACRUPl Geotraverse: Contribution of Teleseismic Data Recorded on Land, I.S.A.E.S. 1995 Proceedings, Terra Antarctica, in press.
Roult, G., and Rouland, D. (1994), Antarctica I: Deep Structure Investigations Inferred from Seismology: A Review, P.E.P.I. 84, 15–32.
Savage, M. K., Silver, P. G., and Meyer, R. P. (1990), Observations of Teleseismic Shear-wave Splitting in the Basin and Range from Portable and Permanent Stations, Geophys. Res. Lett. 17, 21–24.
Savage, M. K., and Silver, P. G. (1993), Mantle Deformation and Tectonics: Constraints from Seismic Anisotropy in Western United States, Phys. Earth Planet. Inter. 78, 207–227.
Silver, P. G., and Chan, W. W. (1988), Implications for Continental Structure and Evolution from Seismic Anisotropy, Nature 335, 34–39.
Silver, P. G. (1996), Seismic Anisotropy beneath the Continents: Probing the Depths of Geology, Ann. Rev. Earth Planet. Sci. 24, 385–432.
Stern, T. A., and ten Brink, U. S. (1989), Flexural Uplift of the Transantarctic Mountains, J. Geophys. Res. 96, 16429–16454.
Vinik, L. P., Makeyeva, L. I., Milev, A., and Yu. Usenko, A. (1992), Global Patterns of Azimuthal Anisotropy and Deformations in the Continental Mantle, Geophys. J. Int. 111, 433–447.
Zhang, Z., and Schwartz, S. Y. (1994), Seismic Anisotropy in the Shallow Crust of the Loma Prieta Segment of the San Andreas Fault System, J. Geophys Res. 99, 9651–9661.
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Pondrelli, S., Azzara, R. (1998). Upper Mantle Anisotropy in Victoria Land (Antarctica). In: Plomerová, J., Liebermann, R.C., Babuška, V. (eds) Geodynamics of Lithosphere & Earth’s Mantle. Pageoph Topical Volumes. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8777-9_10
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DOI: https://doi.org/10.1007/978-3-0348-8777-9_10
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