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High-Resolution Imaging of the Mantle Transition Zone beneath Japan from Sparse Receiver Functions Open Access


Other title
Mantle Discontinuities
Japan Subduction Zone
Mantle Transition Zone
Receiver Functions
Sparse Deconvolution
Type of item
Degree grantor
University of Alberta
Author or creator
Escalante, Christian
Supervisor and department
Heimpel, Moritz (Physics)
Examining committee member and department
Sydora, Richard (Physics)
Boulanger, Pierre (Computing Science)
Heimpel, Moritz (Physics)
Sacchi, Mauricio (Physics)
Department of Physics
Date accepted
Graduation date
Master of Science
Degree level
A new approach to estimate high-resolution receiver functions using a simultaneous iterative time-domain sparse deconvolution is presented. To test its functionality and reliability, several experiments were conducted with synthetic and real seismological data. Furthermore, this technique was employed to obtain a high-resolution image of the mantle transition zone discontinuities beneath Japan. The results show a locally elevated 410-km discontinuity with a topographic relief of up to 10 km; conversely, the 660-km discontinuity shows a large depression of up to ~30 km in regions coincident with the subducting Pacific plate. These results are consistent with previous receiver function and tomographic studies showing a flat lying slab in this region. It is still debatable whether parts of the deflected slab is sinking into the lower mantle or not; since this is not clearly observed from the results. But it appears that the 660-km discontinuity deflection extends further to the west into the Korean Peninsula.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Escalante, C., Gu, Y.J., and Sacchi, M., 2007. Simultaneous iterative time-domain sparse deconvolution to teleseismic receiver functions, Geophys. J. Int., 171, 316-325.

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