Surface-wave group-delay and attenuation kernels |
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| Authors: | F A Dahlen Ying Zhou |
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| Institution: | Department of Geosciences, Princeton University, Princeton, NJ 08544,;USA. E-mail: Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125,;USA |
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| Abstract: | 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 δ c / c or to its dispersion ω(?/?ω)(δ c / c ) as well as to the local group-velocity perturbation δ C / C . This dual dependence makes the ray-theoretical inversion of measured group delays for 2-D maps of δ C / C a dubious procedure, unless the lateral variations in group velocity are extremely smooth. |
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| Keywords: | attenuation Fréchet derivatives global seismology Q sensitivity surface waves |
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