Surface-wave group-delay and attenuation kernels

Details Surface-wave group-delay and attenuation kernels Surface-wave group-delay and attenuation kernels

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.165..545d&link_type=abstract

Geophysical Journal International, Volume 165, Issue 52, pp. 545-554.

Astronomy and Astrophysics

Astronomy

6

Attenuation, Fréchet Derivatives, Global Seismology, Q, Sensitivity, Surface Waves

Scientific paper

We derive both 3-D and 2-D Fréchet sensitivity kernels for surface-wave group-delay and anelastic attenuation measurements. A finite-frequency group-delay exhibits 2-D off-ray sensitivity either to the local phase-velocity perturbation δc/c or to its dispersion ω(∂/∂ω)(δc/c) as well as to the local group-velocity perturbation δC/C. This dual dependence makes the ray-theoretical inversion of measured group delays for 2-D maps of δC/C a dubious procedure, unless the lateral variations in group velocity are extremely smooth.

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