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DOI | 10.1029/2019GL083529 |
"Measures of Dissipation in Viscoelastic Media" Extended: Toward Continuous Characterization Across Very Broad Geophysical Time scales | |
Lau, Harriet C. P.1; Holtzman, Benjamin K.2 | |
2019-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:16页码:9544-9553 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We develop a conceptual/quantitative framework whereby measurements of Earth's viscoelasticity may be assessed across the broad range of geophysical processes, spanning seismic wave propagation, postseismic relaxation, glacial isostatic adjustment, and mantle convection. Doing so requires overcoming three challenges: (A) separating spatial variations from intrinsic frequency dependence in mechanical properties; (B) reconciling different conceptual and constitutive viscoelastic models used to interpret observations at different frequencies; and (C) improving understanding of linear and nonlinear transient deformation mechanisms and their extrapolation from laboratory to earth conditions. We focus on (B), first demonstrating how different mechanical models lead to incompatible viscosity estimates from observations. We propose the determination of the "complex viscosity"-a frequency-dependent parameter complementary to other measures of dissipation (including frequency-dependent moduli and attenuation)-from such observations to reveal a single underlying broadband mechanical model. The complex viscosity illuminates transient creep in the vicinity of the Maxwell time, where most ambiguity lies. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490966700028 |
WOS关键词 | SEISMIC-WAVE ATTENUATION ; UPPER-MANTLE ; POLYCRYSTAL ANELASTICITY ; ENERGY-DISSIPATION ; TIDAL TIMESCALES ; SEA-LEVEL ; CREEP ; MODEL ; MINERALS ; VELOCITY |
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/186238 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA; 2.Columbia Univ, Lamt Doherty Earth Observ, Palisades, NY USA |
推荐引用方式 GB/T 7714 | Lau, Harriet C. P.,Holtzman, Benjamin K.. "Measures of Dissipation in Viscoelastic Media" Extended: Toward Continuous Characterization Across Very Broad Geophysical Time scales[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(16):9544-9553. |
APA | Lau, Harriet C. P.,&Holtzman, Benjamin K..(2019)."Measures of Dissipation in Viscoelastic Media" Extended: Toward Continuous Characterization Across Very Broad Geophysical Time scales.GEOPHYSICAL RESEARCH LETTERS,46(16),9544-9553. |
MLA | Lau, Harriet C. P.,et al.""Measures of Dissipation in Viscoelastic Media" Extended: Toward Continuous Characterization Across Very Broad Geophysical Time scales".GEOPHYSICAL RESEARCH LETTERS 46.16(2019):9544-9553. |
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