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  • 1995-1999  (4)
  • 1
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    Centroid-moment tensor solutions for July-September 1995 (1996)
    In:  Phys. Earth Plan. Int., Luxembourg, U.S. Geological Survey, vol. 97, no. 24, pp. 3-13, pp. B05309, (ISBN 0-471-26610-8)
    Details
    Publication Date: 1996
    Keywords: Moment tensor ; Earthquake catalog ; PEPI ; Ekstroem ; Ekstrom ; nokms
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Continent-ocean chemical heterogeneity in the mantle based on seismic tomography (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-04-21
    Description: Seismic models of global-scale lateral heterogeneity in the mantle show systematic differences below continents and oceans that are too large to be purely thermal in origin. An inversion of the geoid, based on a seismic model that includes viscous flow in the mantle, indicates that the differences beneath continents and oceans can be accounted for by differences in composition in the upper mantle superposed on mantle-wide thermal heterogeneities. The net continent-ocean density differences, integrated over depth, are small and cause only a low flux of mass and heat across the asthenosphere and mantle transition zone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Forte, A M -- Dziewonski, A M -- O'connell, R J -- New York, N.Y. -- Science. 1995 Apr 21;268(5209):386-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17746544" 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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    PAPER CURRENT
  • 3
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    Planet Within a Planet: Rotation of the Inner Core of Earth (1996)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1996-12-13
    Description: The time dependence of the orientation of Earth's inner core relative to the mantle was determined using a recently discovered 10-degree tilt in the axis of symmetry of the inner core's seismic-velocity anisotropy. Two methods of analyzing travel-time variations for rays traversing the inner core, on the basis of 29 years of data from the International Seismological Centre (1964-1992), reveal that the inner core appears to rotate about 3 degrees per year faster than the mantle. An anomalous variation in inner-core orientation from 1969 to 1973 coincides in time with a sudden change ("jerk") in the geomagnetic field.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Su -- Dziewonski -- Jeanloz -- New York, N.Y. -- Science. 1996 Dec 13;274(5294):1883-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉W.-J. Su and A. M. Dziewonski, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. R. Jeanloz, Department of Geology and Geophysics, University of California, Berkeley, CA 94720-4767, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8943196" 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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  • 4
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    Seismic tomography and mixing in the deep earth (1995)
    Copernicus
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    Publication Date: 1995-12-31
    Description: Recently constructed tomographic models of the lateral heterogeneity of elastic properties in the Earth's mantle are contrasted in terms of their implications concerning the extent to which the endothermic phase transformation at 660 km depth is influencing the radial style of mixing. Previously published whole mantle and split mantle tomographic reconstructions, SH8/WMI3 and SH8/U4L8 respectively, fit the seismic observations equally well but disagree on the extent to which radial mixing may be impeded across this depth horizon. We show that inferences from seismic tomographic images based on the application of diagnostic functions (global and regional variance spectra and the radial correlation function) lead to the conclusion that the mantle circulation is whole mantle in style if model SH8/WM13 is employed. The split mantle tomographic inversion SHS/U4L8 leads to the contradictory conclusion that the mantle circulation is significantly impeded across the 660 km depth horizon. This latter interpretation is reinforced when we employ the new higher resolution split mantle model SH12/U7L5 in our calculations. We demonstrate that the depth-dependent radial heat flow delivered by both of the split models implies the existence of a thermal boundary layer at 660 km depth, and therefore significant layering, whereas that delivered by the whole mantle model does not. By insisting that the depth-dependent viscosity profile of the mantle be compatible with the thermal structure if the flow were layered, we argue that the split mantle tomographic inversions lead to a self-consistent description of geodynamic constraints (geoid and postglacial rebound data).
    Print ISSN: 1023-5809
    Electronic ISSN: 1607-7946
    Topics: Geosciences , Physics
    Published by Copernicus on behalf of European Geosciences Union.
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