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Structure of the North American Mantle Constrained by Simultaneous Inversion of Multiple-Frequency SH, SS, and Love Waves

Tian, Yue, Ying Zhou, Karin Sigloch, Guust Nolet, and Gabi Laske (2011), Structure of the North American Mantle Constrained by Simultaneous Inversion of Multiple-Frequency SH, SS, and Love Waves, J. Geophys. Res., 116(B02307), doi:10.1029/2010JB007704.

Abstract
We simultaneously invert for the velocity and attenuation structure of the North American mantle from a mixed data set: -wave traveltime and amplitude anomalies, -wave differential travel-time anomalies, and Love-wave fundamental-mode phase delays. All data are measured for multiple frequency bands, and finite-frequency sensitivity kernels are used to explain the observations.

In the resulting velocity model, a lower mantle plume is observed to originate at about 1500 km depth beneath the Yellowstone area, tilting about 40◦ from vertical. The plume rises up through a gap in the subducting Farallon slab. The SH velocity model confirms high-level segmentation of the Farallon slab, which was observed in the recent P velocity model [Sigloch et al., 2008]. Attenuation structure is resolvable in the upper mantle and transition zone; in estimating it, we correct for focusing. High correlation coefficients between ln S and δlnQS under the Central and Eastern U.S. suggest one main physical source, most likely temperature. The smaller correlation coefficients and larger slopes of the δlnQS-δlnVS relationship under the Western U.S. suggest an influence of non-thermal factors such as the existence of water and partial melt. Finally, we analyze the influence of the different components of our data set. The addition of Love-wave phase delays helps to improve the resolution of both velocity and attenuation, and the effect is noticeable even in the lower mantle.

Download pdf offprint: 2010_TianZhouSiglochNoletLaske_GJIaccepted.pdf
BibTeX
@article{id1524,
  author = {Yue Tian and Ying Zhou and Karin Sigloch and Guust Nolet and Gabi Laske},
  journal = {J. Geophys. Res.},
  month = {dec},
  number = {B02307},
  title = {{Structure of the North American Mantle Constrained by Simultaneous Inversion of Multiple-Frequency SH, SS, and Love Waves}},
  volume = {116},
  year = {2011},
  language = {en},
  url = {http://www.geophysik.uni-muenchen.de/~sigloch/papers/2010{\_}TianZhouSiglochNoletLaske{\_}GJIaccepted.pdf},
  doi = {10.1029/2010JB007704},
}
EndNote
%0 Journal Article
%A Tian, Yue
%A Zhou, Ying
%A Sigloch, Karin
%A Nolet, Guust
%A Laske, Gabi
%D 2011
%N B02307
%V 116
%J J. Geophys. Res.
%T Structure of the North American Mantle Constrained by Simultaneous Inversion of Multiple-Frequency SH, SS, and Love Waves
%U http://www.geophysik.uni-muenchen.de/~sigloch/papers/2010_TianZhouSiglochNoletLaske_GJIaccepted.pdf
%8 dec
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Printed 20. Mar 2019 04:47