Statistics – Computation
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmdi41a1781l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #DI41A-1781
Statistics
Computation
[0545] Computational Geophysics / Modeling, [8120] Tectonophysics / Dynamics Of Lithosphere And Mantle: General, [8155] Tectonophysics / Plate Motions: General
Scientific paper
A new code has been developed for computing global plate velocities via a comprehensive force inversion. This code contains an automatic procedure to estimate slab pull forces using focal mechanisms of intermediate to deep earthquakes, as well as a triangular tessellation method to calculate total integrated torques. The tessellation method has the advantage of dividing the Earth's surface into equal areas, as opposed to traditional latitude-longitude grids, which provide much denser coverage near the poles. The code also has the ability to include resistive slab bending forces (similarly to Wu et al., 2008) in addition to those arising from mantle density anomalies and slab pull. We plan to present results from the first simulations to include slab pull in a way that is constrained by seismicity, relying on no added parameters. Finally, the code will soon be outfitted with the ability to compute the period of the gravitational oscillation in length of day, based on the shape of the CMB geoid. This period can then be compared to the Earth's observed periodicity in order to better constrain the mass distribution in the lower mantle. Reference cited: Wu, B., C. P. Conrad, A. Heuret, C. Lithgow-Bertelloni, and S. Lallemand (2008), Reconciling strong slab pull and weak plate bending: The plate motion constraint on the strength of mantle slabs, Earth and Planetary Science Letters, 272, 412-421.
Becker Thorsten W.
Buffett Bruce Allen
Lewis K. C.
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