气候变化领域集成服务门户(CCPortal): Effect of Fluid Viscosity on Fault Reactivation and Coseismic Weakening

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DOI	10.1029/2019JB018883
	Effect of Fluid Viscosity on Fault Reactivation and Coseismic Weakening
	Cornelio C.; Passelègue F.X.; Spagnuolo E.; Di Toro G.; Violay M.
发表日期	2020
ISSN	21699313
卷号	125 期号:1
英文摘要	High-viscosity fluids are often used during hydraulic fracking operations in georeservoirs. Here we performed dedicated experiments to study the influence of fluid viscosity on fault reactivation and associated induced earthquakes. Experiments were conducted in the rotary-shear machine Slow to HIgh Velocity Apparatus on experimental fault of Westerly granite saturated by fluids with increasing viscosity (at room temperature) from 0.1 mPa s (water) to 1.2 Pa s (99% glycerol). Fault reactivation was triggered at constant effective normal stress by increasing the shear stress acting on the fault. Our results showed that independent of the viscosity, fault reactivation followed a Coulomb-failure criterion. Instead, fluid viscosity affected the fault weakening mechanism: flash heating was the dominant weakening mechanism in room humidity and water-saturated conditions, whereas the presence of more viscous fluids favored the activation of elasto-hydrodynamic lubrication. Independent of the weakening mechanism, the breakdown work Wb dissipated during seismic faulting increased with slip U following a power law (Wb ∝ U 1.25) in agreement with seismological estimates of natural and induced earthquakes. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	coseismic weakening; fault reactivation; fluid lubrication
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/188040
作者单位	Laboratory of Experimental Rock Mechanics, EPFL, Lausanne, Switzerland; Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; Dipartimento di Geoscienze, Università degli Studi di Padova, Padua, Italy
推荐引用方式 GB/T 7714	Cornelio C.,Passelègue F.X.,Spagnuolo E.,et al. Effect of Fluid Viscosity on Fault Reactivation and Coseismic Weakening[J],2020,125(1).
APA	Cornelio C.,Passelègue F.X.,Spagnuolo E.,Di Toro G.,&Violay M..(2020).Effect of Fluid Viscosity on Fault Reactivation and Coseismic Weakening.Journal of Geophysical Research: Solid Earth,125(1).
MLA	Cornelio C.,et al."Effect of Fluid Viscosity on Fault Reactivation and Coseismic Weakening".Journal of Geophysical Research: Solid Earth 125.1(2020).