Exploration of the best reference material on anelastic measurement by cyclic loading under high pressure

Liu, Chao; Yoshino, Takashi; Tsujino, Noriyoshi; Gomi, Hitoshi; Sakurai, Masahiro; Zhang, Youyue; Wang, Ran; Guan, Longli; Lau, Kayan; Tange, Yoshinori; Higo, Yuji

doi:10.1080/08957959.2021.2013834

Cited by 1 publication

(3 citation statements)

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“…Subsequently, a short-period cyclic loading system was installed for in situ X-ray observation under high pressure with the D-DIA press at the bending magnet beamline BL04B1 at SPring-8 ( 20 ). This system enables the generation of controlled oscillation periods (0.5 to 1,000 s) by cyclic loading and observation of small strain () changes in samples ( 21 ). Unknown samples and the standard (ideal elastic material) were arranged in a series parallel to the axis for cyclic loading.…”

Section: Methodsmentioning

confidence: 99%

“…The pressure was calibrated by the equation of state of MgO ( 39 ). Flexible graphite (PERMA-FOIL) was used as the potential reference ( 21 ). The length ratio of the sample and reference was adjusted to identify the produced strain of the sample and reference from X-ray radiography images ( SI Appendix , Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Recent technical developments using synchrotron X-ray radiation combined with deformation-DIA apparatus have enabled anelasticity measurements to be performed over a wide range of oscillation periods at high pressures of up to 15 GPa ( 19 ). The short-period cyclic loading system installed at the SPring-8 beamline BL04B1 has expanded the oscillation period range to a minimum of 0.5 s ( 20 ), while the flexible graphite as a reference material has made it possible to determine anelastic parameters more accurately ( 21 ). Using this system, we conducted a series of forced oscillation experiments on presynthesized polycrystalline forsterite samples to determine the influence of water on the attenuation factor ( Q −1 ) and shear modulus ( G ) at 3 GPa ( 22 ).…”

mentioning

confidence: 99%

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Effect of water on seismic attenuation of the upper mantle: The origin of the sharp lithosphere–asthenosphere boundary

Liu

Yoshino

Tsujino

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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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.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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