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- W2100075512 abstract "We use a coupled surface wave version of the Born approximation to compute the3-D sensitivity kernel KT(r) of a seismic body wave traveltime T measured by cross-correlation of a broad-band waveform with a spherical earth synthetic seismogram. The geometry of a teleseismic S wave kernel is, at first sight, extremely paradoxical: the sensitivity is zero everywhere along the geometrical ray! The shape of the kernel resembles that of a hollow banana; in a cross-section perpendicular to the ray, the shape resembles a doughnut. The cross-path extent of such a banana–doughnut kernel depends upon the frequency content of the wave. The kernel for a very high-frequency wave is a very skinny hollow banana; wave-speed heterogeneity wider than this banana affects the traveltime, in accordance with ray theory. We also use the Born approximation to compute the sensitivity kernel KΔT(r) of a differential traveltime ΔT measured by cross-correlation of two phases, such as SS and S, at the same receiver. The geometries of both an absolute SS wave kernel and a differential SS–S kernel are extremely complicated, particularly in the vicinity of the surface reflection point and the source-to-receiver and receiver-to-source caustics, because of the minimax character of the SS wave. Heterogeneity in the vicinity of the source and receiver exerts a negligible influence upon an SS–S differential traveltime ΔT only if it is smooth." @default.
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- W2100075512 date "1999-06-01" @default.
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- W2100075512 title "Three-dimensional sensitivity kernels for finite-frequency traveltimes: the banana-doughnut paradox" @default.
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- W2100075512 doi "https://doi.org/10.1046/j.1365-246x.1999.00837.x" @default.
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