globalchange  > 过去全球变化的重建
DOI: 10.1016/j.epsl.2013.02.033
论文题名:
The effect of methane hydrate morphology and water saturation on seismic wave attenuation in sand under shallow sub-seafloor conditions
作者: Angus I. Besta; ; ; Jeffrey A. Priestb; Christopher R.I. Claytonb; Emily V.L. Reesb
刊名: Earth and Planetary Science Letters
ISSN: 0012-1042X
出版年: 2013
卷: Volume 368, 页码:Pages 78-87
语种: 英语
英文关键词: seismic attenuation ; hydrate ; sediment ; morphology
英文摘要: A better understanding of seismic wave attenuation in hydrate-bearing sediments is needed for the improved geophysical quantification of seafloor methane hydrates, important for climate change, geohazard and economic resource assessment. Hence, we conducted a series of small strain (<10−6), seismic frequency (50–550 Hz), laboratory resonant column experiments on synthetic methane hydrate-bearing sands under excess-water seafloor conditions. The results show a complex dependence of P- and S-wave attenuation on hydrate saturation and morphology. P- and S-wave attenuation in excess-water hydrate-bearing sand is much higher than in excess-gas hydrate-bearing sand and increases with hydrate saturation between 0 and 0.44 (the experimental range). Theoretical modelling suggests that load-bearing hydrate is an important cause of heightened attenuation for both P- and S-waves in gas and water saturated sands, while pore-filling hydrate also contributes significantly to P-wave attenuation in water saturated sands. A squirt flow attenuation mechanism, related to microporous hydrate and low aspect ratio pores at the interface between sand grains and hydrate, is thought to be responsible for the heightened levels of attenuation in hydrate-bearing sands at low hydrate saturations (<0.44).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/12056
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性

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Recommended Citation:
Angus I. Besta,,,et al. The effect of methane hydrate morphology and water saturation on seismic wave attenuation in sand under shallow sub-seafloor conditions[J]. Earth and Planetary Science Letters,2013-01-01,Volume 368
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