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DOI | 10.1029/2018GL081271 |
Low-Frequency Measurements of Seismic Moduli and Attenuation in Antigorite Serpentinite | |
David, Emmanuel C.1; Brantut, Nicolas1; Hansen, Lars N.2; Jackson, Ian3 | |
2019-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:4页码:1993-2002 |
文章类型 | Article |
语种 | 英语 |
国家 | England; Australia |
英文摘要 | Laboratory measurements of seismic moduli and attenuation in antigorite serpentinite at a confining pressure of 200 MPa and temperatures up to 550 degrees C provide new results relevant to the interpretation of geophysical data in subduction zones. A polycrystalline antigorite specimen was tested via forced oscillations at small strain amplitudes and seismic frequencies (millihertz to hertz). The shear modulus has a temperature sensitivity, partial derivative G/partial derivative T, averaging -0.017 GPa/K. Increasing temperature above 500 degrees C results in more intensive shear attenuation (Q(G)(-1)) and associated modulus dispersion, with Q(G)(-1) increasing monotonically with increasing oscillation period and temperature. This "background" relaxation is adequately captured by a Burgers model for viscoelasticity and possibly results from intergranular mechanisms. Attenuation is higher in antigorite (log(10)Q(G)(-1) approximate to -1.5 at 550 degrees C and 0.01 Hz) than in olivine (log(10)Q(G)(-1) << -2.0 below 800 degrees C), but such contrast does not appear to be strong enough to allow robust identification of antigorite from seismic models of attenuation only. |
英文关键词 | antigorite serpentinite subduction zones seismic velocity seismic attenuation viscoelastic relaxation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000461855600012 |
WOS关键词 | WAVE ATTENUATION ; HIGH-PRESSURE ; DEFORMATION MECHANISMS ; VELOCITIES ; PERIDOTITES ; ROCKS ; DISPERSION ; ANISOTROPY ; RHEOLOGY ; MODEL |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27033 |
专题 | 气候变化 |
作者单位 | 1.UCL, Dept Earth Sci, London, England; 2.Univ Oxford, Dept Earth Sci, Oxford, England; 3.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia |
推荐引用方式 GB/T 7714 | David, Emmanuel C.,Brantut, Nicolas,Hansen, Lars N.,et al. Low-Frequency Measurements of Seismic Moduli and Attenuation in Antigorite Serpentinite[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(4):1993-2002. |
APA | David, Emmanuel C.,Brantut, Nicolas,Hansen, Lars N.,&Jackson, Ian.(2019).Low-Frequency Measurements of Seismic Moduli and Attenuation in Antigorite Serpentinite.GEOPHYSICAL RESEARCH LETTERS,46(4),1993-2002. |
MLA | David, Emmanuel C.,et al."Low-Frequency Measurements of Seismic Moduli and Attenuation in Antigorite Serpentinite".GEOPHYSICAL RESEARCH LETTERS 46.4(2019):1993-2002. |
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