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DOI	10.1016/j.epsl.2020.116701
	Quantifying dynamic pressure and temperature conditions on fault asperities during earthquake slip
	Hayward K.S.; Le Losq C.; Cox S.F.
发表日期	2021
ISSN	0012821X
卷号	555
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203124
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
推荐引用方式 GB/T 7714	Hayward K.S.,Le Losq C.,Cox S.F.. Quantifying dynamic pressure and temperature conditions on fault asperities during earthquake slip[J],2021,555.
APA	Hayward K.S.,Le Losq C.,&Cox S.F..(2021).Quantifying dynamic pressure and temperature conditions on fault asperities during earthquake slip.Earth and Planetary Science Letters,555.
MLA	Hayward K.S.,et al."Quantifying dynamic pressure and temperature conditions on fault asperities during earthquake slip".Earth and Planetary Science Letters 555(2021).