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  • 1
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    Seismic evidence for a detached Indian lithospheric mantle beneath Tibet (1999)
    In:  Science, New York, Conseil de l'Europe, vol. 283, no. 5406, pp. 1306, pp. L10608, (ISSN: 1340-4202)
    Details
    Publication Date: 1999
    Keywords: Deep seismic sounding (espec. cont. crust) ; Plate tectonics ; China ; CRUST ; earth mantle
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Frozen and active seismic anisotropy beneath southern Africa (2012)
    Wiley
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    Publication Date: 2012-04-17
    Description: P receiver functions from 23 stations of the SASE experiment in southern Africa are inverted simultaneously with SKS waveforms for azimuthal anisotropy in the upper mantle. Our analysis resolves the long-standing issue of depth dependence and origins of anisotropy beneath southern Africa. In the uppermost mantle we observe anisotropy with a nearly E-W fast direction, parallel to the trend of the Limpopo belt. This anisotropy may be frozen since the Archean. At a depth of 160 km the fast direction of anisotropy changes to 40° and becomes close to the recent plate motion direction. This transition is nearly coincident in depth with activation of dominant glide systems in olivine and with a pronounced change in other properties of the upper mantle. Another large change in the fast direction of anisotropy corresponds to the previously found low-S-velocity layer atop the 410-km discontinuity.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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    PAPER CURRENT
  • 3
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    Crustal Structure in Central‐Eastern Greenland From Receiver Functions (2019)
    Wiley
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    Publication Date: 2019
    Description: Abstract The crustal structure in the interior of Greenland is largely unknown because of its remote location below the up to 3.4‐km‐thick ice sheet. We present a model of the crustal velocity structure in central‐eastern Greenland based on simultaneous inversion of P and S receiver functions for data acquired at 23 broadband stations between the coast and the center of the ice sheet. The area is believed to mainly include Precambrian basement and includes a part covered by Tertiary volcanic rocks and some sedimentary basins. Our results show a westward deepening Moho from less than 20 km at the coast to 50 km below central Greenland. Crustal S wave velocities are generally 3.75 km/s through the whole crust which may be relatively small for Precambrian areas, and Vp/Vs is generally around 1.73, although slightly higher in central Greenland. In the coastal area we observe anomalously low velocities at the top of the crust. In the volcanic area south of Scoresbysund Fjord this layer has very high Vp/Vs (〉2), which indicates a high mafic content and the presence of water‐filled cracks in the basaltic material. In the north, outside the volcanic area, Vp/Vs is normal and the low‐velocity layer probably is instead related to the presence of sedimentary basins. At stations in the center of our study area we find low Vs and high Vp/Vs in the lower crust. Based on the Moho topography, our results do not support Airy type isostasy as explanation of the high topography in eastern Greenland.
    Print ISSN: 2169-9313
    Electronic ISSN: 2169-9356
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 4
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    Seismic Evidence for a Detached Indian Lithospheric Mantle Beneath Tibet (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-02-26
    Description: P-to-S converted teleseismic waves recorded by temporary broadband networks across Tibet show a north-dipping interface that begins 50 kilometers north of the Zangbo suture at the depth of the Moho (80 kilometers) and extends to a depth of 200 kilometers beneath the Bangong suture. Under northern Tibet a segmented south-dipping structure was imaged. These observations suggest a different form of detachment of the Indian and Asian lithospheric mantles caused by differences in their composition and buoyancy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kosarev -- Kind -- Sobolev -- Yuan -- Hanka -- Oreshin -- New York, N.Y. -- Science. 1999 Feb 26;283(5406):1306-1309.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of the Physics of the Earth, Russian Academy of Sciences, B. Gruzinskaya 10, 128810 Moscow, Russia. GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany. Freie Universitat Berlin, Geophysik, Malteser Strasse 74-100, 12249 Berlin, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10037597" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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