globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116701
论文题名:
Quantifying dynamic pressure and temperature conditions on fault asperities during earthquake slip
作者: Hayward K.S.; Le Losq C.; Cox S.F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 555
语种: 英语
中文关键词: densification ; fictive temperature ; frictional melting ; laboratory earthquakes ; Raman spectroscopy
英文关键词: Glass ; Melting ; Quenching ; Seismology ; Silica ; Silicon ; Slip forming ; Stick-slip ; Asperity contacts ; Dynamic pressures ; Pressure and temperature ; Quench temperature ; Structural rearrangement ; Systematic changes ; Temperature increase ; Vibrational modes ; Fault slips ; asperity ; earthquake ; fault ; fault slip ; melting ; P-T conditions ; Raman spectroscopy ; Trachinotus falcatus
英文摘要: New insights into the pressure and temperature conditions on fault surfaces during seismic slip are provided by Raman-active vibrational modes of SiO2 glass. We performed triaxial stick-slip experiments at room temperature and high normal stresses on pre-ground, high-purity silica glass surfaces. During slip, velocities exceed 0.32 m s−1 over durations of less than one millisecond, generating frictional heat and locally melting the fault surfaces. Temperature increases permit structural rearrangement within the melt; these changes are preserved by rapid quenching. Using Raman spectroscopy, we analyse melt-welded regions and show that these areas exhibit systematic changes in the spectra of silica. Changes result from a decrease in the inter-tetrahedral Si-O-Si bond angle and are correlated to increasing silica glass density in the slip regions. Densification results from both rapid cooling rates and exposure to very high pressures at asperity contacts. We use data from other experiments to calibrate these effects, estimating quench temperatures up to 1800 K and pressures of ∼180 MPa. These results provide the first quantitative evidence for the effects of quench rates and high inter-asperity pressures on the physics of melting and quenching during seismic slip and its impact on fault behaviour. © 2020 Elsevier B.V.
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被引频次[WOS]:1   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165502
Appears in Collections:气候变化与战略

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作者单位: Research School of Earth Sciences, Australian National University, Mills Road, Canberra, ACT 2601, Australia; Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, F-75005, France

Recommended Citation:
Hayward K.S.,Le Losq C.,Cox S.F.. Quantifying dynamic pressure and temperature conditions on fault asperities during earthquake slip[J]. Earth and Planetary Science Letters,2021-01-01,555
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