Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.178.1403z&link_type=abstract
Geophysical Journal International, Volume 178, Issue 53, pp. 1403-1410.
Astronomy and Astrophysics
Astronomy
5
Surface Waves And Free Oscillations, Seismic Attenuation, Seismic Tomography, Theoretical Seismology, Wave Scattering And Diffraction
Scientific paper
Lateral variations in mantle anelasticity (Q) are important for understanding the Earth's thermal and chemical structure in the mantle. In the past decades, preliminary global 3-D tomographic Q models have been developed based upon the assumption that traveltime (phase delay) anomalies are due to the Earth's elastic (velocity) structure whereas amplitude anomalies are dominated by 3-D anelastic (Q) structure. In this paper, we calculate the 3-D finite-frequency sensitivity of fundamental-mode surface-wave phase delays and amplitudes to perturbations in anelasticity (Q). Calculations of Q and velocity sensitivity kernels show that (1) roughly 15-20 per cent of observed phase delays in long-period surface waves can be explained by lateral variations in Q in the upper mantle; and (2) focusing and defocusing effects due to 3-D velocity structure account for a major portion of observed amplitude perturbations in long-period surface waves. The coupling between elastic and anelastic effects in both seismic traveltimes and amplitudes indicates that a joint inversion of 3-D velocity and 3-D Q structure accounting for both anelastic dispersion and associated focusing and defocusing effects is necessary in mapping lateral heterogeneities in the upper mantle.
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