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  • 1
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    State of stress within a bending spherical shell and its implications for subducting lithosphere (1998)
    In:  Geophys. J. Int., Kunming, China, AGU, vol. 134, no. 1, pp. 199-206, pp. 2211, (ISSN: 1340-4202)
    Details
    Publication Date: 1998
    Keywords: Stress ; Subduction zone ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Plate tectonics ; Modelling ; Elasticity ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Mapping convection in the mantle (1984)
    In:  Geophys. Res. Lett., Kunming, China, AGU, vol. 11, no. 4, pp. 287-290, pp. 2211, (ISSN: 1340-4202)
    Details
    Publication Date: 1984
    Keywords: ConvolutionE ; Plate tectonics ; Seismology ; Tomography ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    High-resolution global upper mantle structure and plate tectonics (1993)
    In:  J. Geophys. Res., Kunming, China, 3-4, vol. 98, no. 2, pp. 9793-9823, pp. B05301, (ISSN: 1340-4202)
    Details
    Publication Date: 1993
    Keywords: Seismology ; Plate tectonics ; earth mantle ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Lateral heterogeneity and azimuthal anistropy of the upper mantle: Love and Rayleigh waves 100-250 sec (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The lateral heterogeneity and apparent anisotropy of the upper mantle are studied by measuring Rayleigh and Love wave phase velocities in the period range 100-250 sec. Spherical harmonic descriptions of the lateral heterogeneity are obtained for order and degree up to 1=m=10. Slow regions are evident at the East Pacific rise, northeast Africa, Tibet, Tasman sea, southwestern North America and triple junctions in the Northern Atlantic and Indian oceans. Fast regions occur in Australia, western Pacific and the eastern Atlantic. Details which are not evident in previous studies include two fast regions in the central Pacific and the subduction zone in the Scotia Arc region. Inversion for azimuthal dependence showed (1) little correlation between the fast phase velocity directions and the plate motion vector in plate interiors, but (2) correlation of the fast direction with the perpendicular direction to trenches and ridges. Phase velocity is high when waves propagate perpendicular to these structures. Severe tradeoffs exist between heterogeneity and azimuthal dependence because of the yet unsatisfactory path coverage.
    Keywords: GEOPHYSICS
    Type: NASA-CR-174619 , NAS 1.26:174619
    Format: application/pdf
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  • 5
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    Waveform inversion of mantle Love waves: The born seismogram approach (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Normal mode theory, extended to the slightly laterally heterogeneous Earth by the first-order Born approximation, is applied to the waveform inversion of mantle Love waves (200-500 sec) for the Earth's lateral heterogeneity at l=2 and a spherically symmetric anelasticity (Q sub mu) structure. The data are from the Global Digital Seismograph Network (GDSN). The l=2 pattern is very similar to the results of other studies that used either different methods, such as phase velocity measurements and multiplet location measurements, or a different data set, such as mantle Rayleigh waves from different instruments. The results are carefully analyzed for variance reduction and are most naturally explained by heterogeneity in the upper 420 km. Because of the poor resolution of the data set for the deep interior, however, a fairly large heterogeneity in the transition zones, of the order of up to 3.5% in shear wave velocity, is allowed. It is noteworthy that Love waves of this period range can not constrain the structure below 420 km and thus any model presented by similar studies below this depth are likely to be constrained by Rayleigh waves (spheroidal modes) only.
    Keywords: GEOPHYSICS
    Type: NASA-CR-174483 , NAS 1.26:174483 , CONTRIB-3996
    Format: application/pdf
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  • 6
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    Lateral heterogeneity and azimuthal anisotropy of the upper mantle - Love and Rayleigh waves 100-250 sec (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The lateral heterogeneity and apparent anisotropy of the upper mantle are studied by measuring Rayleigh and Love wave phase velocities in the period range 100-250 sec. Spherical harmonic descriptions of the lateral heterogeneity are obtained for order and degree up to 1=m=10. Slow regions are evident at the East Pacific rise, northeast Africa, Tibet, Tasman sea, southwestern North America and triple junctions in the Northern Atlantic and Indian oceans. Fast regions occur in Australia, western Pacific and the eastern Atlantic. Details which are not evident in previous studies include two fast regions in the central Pacific and the subduction zone in the Scotia Arc region. Inversion for azimuthal dependence showed (1) little correlation between the fast phase velocity directions and the plate motion vector in plate interiors, but (2) correlation of the fast direction with the perpendicular direction to trenches and ridges. Phase velocity is high when waves propagate perpendicular to these structures. Severe tradeoffs exist between heterogeneity and azimuthal dependence because of the yet unsatisfactory path coverage.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 1842-185
    Format: text
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  • 7
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    A simple derivation of the formula to calculate synthetic long-period seismograms in a heterogeneous earth by normal mode summation (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A simple modification of Gilbert's formula to account for slight lateral heterogeneity of the earth leads to a convenient formula to calculate synthetic long period seismograms. Partial derivatives are easily calculated, thus the formula is suitable for direct inversion of seismograms for lateral heterogeneity of the earth. Previously announced in STAR as N83-29893
    Keywords: GEOPHYSICS
    Type: Geophysical Journal (ISSN 0016-8009); 77; 275-278
    Format: text
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  • 8
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    Mapping convection in the mantle (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Long-period (100-250 sec.) Love and Rayleigh waves are used to map heterogeneity and azimuthal anisotropy in the upper mantle. Spherical harmonic descriptions of anisotropy up to l = m = 3 and 2 theta are derived. Azimuthal anisotropy obtains values as high as 1.5 percent. There is good correlation of fast Rayleigh wave directions with upper mantle return flow directions derived from kinematic considerations. This is consistent with a-axis of olivine being aligned in the flow direction. The main differences between the flow models and the Rayleigh wave azimuthal variation maps occur in the vicinity of hotspots. The correlation of azimuthal anisotropy with upper mantle return flow directions, rather than with plate directions, suggests that part of the return flow is in the upper mantle and this, in turn, implies a low viscosity channel.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 287-290
    Format: text
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  • 9
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    A simple derivation of the formula to calculated synthetic long-period seismograms in a heterogeneous Earth by normal mode summation (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A simple modification of Gilbert's formula to account for slight lateral heterogeneity of the Earth leads to a convenient formula to calculate synthetic long period seismograms. Partial derivatives are easily calculated, thus the formula is suitable for direct inversion of seismograms for lateral heterogeneity of the Earth.
    Keywords: GEOPHYSICS
    Type: NASA-CR-172818 , NAS 1.26:172818 , CONTRIB-3909
    Format: application/pdf
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  • 10
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    Waveform inversion of mantle Love waves - The Born seismogram approach (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Normal mode theory, extended to the slightly laterally heterogeneous earth by the first-order Born approximation, is applied to the waveform inversion of mantle Love waves (200-500 sec) for the earth's lateral heterogeneity at l = 2 and a spherically symmetric anelasticity (Q sub mu) structure. The data are from the Global Digital Seismograph Network (GDSN). The l = 2 pattern is very similar to the results of other studies that used either different methods, such as phase velocity measurements and multiplet location measurements, or a different data set, such as mantle Rayleigh waves from different instruments. The results are carefully analyzed for variance reduction and are most naturally explained by heterogeneity in the upper 420 km. Because of the poor resolution of the data set for the deep interior, however, a fairly large heterogeneity in the transition zones, of the order of up to 3.5 percent in shear wave velocity, is allowed. It is noteworthy that Love waves of this period range can not constrain the structure below 420 km and thus any model presented by similar studies below this depth are likely to be constrained by Rayleigh waves (spheroidal modes) only.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal (ISSN 0016-8009); 78; 641-660
    Format: text
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