Attenuation Of Rayleigh-Waves Across The Volcanic Area Of The Massif Central, France
PHYSICS OF THE EARTH AND PLANETARY INTERIORS(1980)
摘要
Rayleigh wave attenuation is investigated for periods ranging from 20 to 90 s, along a 450 km-long profile following the Oligocene tensile zone of the French Massif Central. A model is deduced by inversion, assuming that the S-wave intrinsic quality factor Q β is frequency-independent, and yields a mean value Q β = 43 ± 10 for the first 100 km in the upper mantle. This value, far lower than the mean value obtained in Eurasia, is close to those obtained in other recent tensile areas, e.g., the western United States or mid-oceanic ridges. A velocity-depth model for S-waves, deduced in a previous study from surface-wave propagation, has been corrected for the attenuation effect. We find a discrepancy between the corrected S-model and P-wave residuals in the same area, implying that Q β must be frequency-dependent. This can be a clue for partial melting in the upper mantle beneath this region.
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关键词
quality factor,surface wave,rayleigh waves,partial melting,upper mantle,mid ocean ridge
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