Sensitivity of SS precursors to topography on the upper-mantle 660-km discontinuity

Details Sensitivity of SS precursors to topography on the upper-mantle 660-km discontinuity Sensitivity of SS precursors to topography on the upper-mantle 660-km discontinuity

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2613c&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 21, p. 2613-2616

Physics

Geophysics

36

Seismology: Body Wave Propagation, Seismology: Core And Mantle, Seismology: Theory And Modeling, Mathematical Geophysics: Modeling

Scientific paper

The sensitivity of SS precursors to the presence of topography on the 660-km discontinuity is addressed using an axisymmetric finite difference approximation to the SH wave propagation in the Earth mantle. Numerical experiments are lead to quantify the bias in both wavelength and amplitude committed in estimating depth information on the upper-mantle discontinuities from ray inversion of SdS arrival times. It is further shown that long period S660S arrival-times do not provide information on the deepening of the `660' in presence of a velocity increase expected as the thermal signature of a subducting slab.

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