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• W4385409897 abstract "Oceanic lithosphere moves over a mechanically weak layer (asthenosphere) characterized by low seismic velocity and high attenuation. Near mid-ocean ridges, partial melting can produce such conditions because of the high-temperature geotherm. However, seismic observations have also shown a large and sharp velocity reduction under oceanic plates at the lithosphere-asthenosphere boundary (LAB) far from mid-ocean ridges. Here, we report the effect of water on the seismic properties of olivine aggregates in water-undersaturated conditions at 3 GPa and 1,223 to 1,373 K via in-situ X-ray observation using cyclic loading. Our results show that water substantially enhances the energy dispersion and reduces the elastic moduli over a wide range of seismic frequencies (0.5 to 1,000 s). An attenuation peak that appears at higher frequencies (1 to 5 s) becomes more pronounced as the water content increases. If water exists only in the asthenosphere, this is consistent with the observation that the attenuation in the asthenosphere is almost constant over a wide frequency range. These sharp seismic changes at the oceanic LAB far from mid-ocean ridges could be explained by the difference in water content between the lithosphere and asthenosphere." @default.
• W4385409897 created "2023-08-01" @default.
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• W4385409897 date "2023-07-31" @default.
• W4385409897 modified "2023-10-03" @default.
• W4385409897 title "Effect of water on seismic attenuation of the upper mantle: The origin of the sharp lithosphere–asthenosphere boundary" @default.
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• W4385409897 doi "https://doi.org/10.1073/pnas.2221770120" @default.
• W4385409897 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37523543" @default.
• W4385409897 hasPublicationYear "2023" @default.
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