Global multiresolution models of surface wave propagation: comparing equivalently regularized Born and ray theoretical solutions

Details Global multiresolution models of surface wave propagation: comparing equivalently regularized Born and ray theoretical solutions Global multiresolution models of surface wave propagation: comparing equivalently regularized Born and ray theoretical solutions

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.167..238b&link_type=abstract

Geophysical Journal International, Volume 167, Issue 1, pp. 238-252.

Astronomy and Astrophysics

Astronomy

17

Scattering Theory, Seismic Resolution, Tomography, Upper Mantle

Scientific paper

I invert a large set of teleseismic phase-anomaly observations, to derive tomographic maps of fundamental-mode surface wave phase velocity, first via ray theory, then accounting for finite-frequency effects through scattering theory, in the far-field approximation and neglecting mode coupling. I make use of a multiple-resolution pixel parametrization which, in the assumption of sufficient data coverage, should be adequate to represent strongly oscillatory Fréchet kernels. The parametrization is finer over North America, a region particularly well covered by the data. For each surface-wave mode where phase-anomaly observations are available, I derive a wide spectrum of plausible, differently damped solutions; I then conduct a trade-off analysis, and select as optimal solution model the one associated with the point of maximum curvature on the trade-off curve. I repeat this exercise in both theoretical frameworks, to find that selected scattering and ray theoretical phase-velocity maps are coincident in pattern, and differ only slightly in amplitude.

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