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- W1969133084 abstract "The slope a of the relation δtS=aδtP+b for the teleseismic S and P travel time residuals δts and δtp is practically the only robust observational value that is equally sensitive to the lateral S and P velocity variations in the upper mantle. Published estimates of a for North America are about twice higher than those at ultrasonic frequencies in olivine at comparable pressures and temperatures. In our study, lateral variations of the S residuals in North America are found not from the S wave readings, which can be easily biased, but from accurately determined delays relative to P of the Ps phases converted from `410 km' and `660 km' discontinuities. Nevertheless, the estimates of a thus derived are close to the values obtained with the standard technique. The discrepancy between the ultrasonic and seismic estimates of a can be explained by physical velocity dispersion. On the assumption of a single absorption band, our value of a is consistent with the published values of Q in the seismic frequency band and velocities in the ultrasonic range, if the high-frequency cutoff of the absorption band in the upper mantle beneath western North America is on the order of several hundred Hertz. However, in the literature there are indications of a cutoff at around 1 Hz. Then our data imply the presence of another absorption band at high frequencies outside the seismic frequency band. This band may correspond to the viscous dissipation in the Walsh [Walsh, J.B., 1969. A new analysis of attenuation in partially melted rock. J. Geophys. Res., 74, 4333–4337] model of penny-shaped inclusions of melt." @default.
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- W1969133084 date "1999-12-01" @default.
- W1969133084 modified "2023-10-18" @default.
- W1969133084 title "Teleseismic travel time residuals in North America and anelasticity of the asthenosphere" @default.
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- W1969133084 doi "https://doi.org/10.1016/s0031-9201(99)00132-6" @default.
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