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| DOI | 10.1016/j.epsl.2020.116179 |
| Dilatancy-induced fluid pressure drop during dynamic rupture: Direct experimental evidence and consequences for earthquake dynamics | |
| Brantut N. | |
| 发表日期 | 2020 |
| ISSN | 0012821X |
| 卷号 | 538 |
| 英文摘要 | Fluid pressure and flow in the crust are key parameters controlling earthquake physics. Since earthquake slip is linked to spatio-temporal localisation of deformation, it is expected that the local fluid pressure around the fault plane could potentially impact the dynamic strength of the slipping fault zone. Coseismic fluid pressure drops have been inferred from field studies, notably in gold deposits which are thought to be formed by this process, but reliable quantitative predictions are still lacking. Here, experimental results are presented where local on- and off-fault fluid pressure variations were measured in situ during dynamic rock fracture and frictional slip under upper crustal stress conditions. During the main rupture, the on-fault fluid pressure dropped rapidly to zero, indicating partial vaporisation and/or degassing. Further deformation produced stick-slip events systematically associated with near-instantaneous drops in fluid pressure, providing direct experimental support of the concept of “seismic suction pump”. In situ fluid volume and wave speed measurements together with microstructural investigations show that dilatancy is the process driving fluid pressure drops during rupture and slip. Extrapolation of the laboratory results indicate that dilatancy-induced fluid pressure drops might be a widespread phenomenon in the crust, counteracting thermal pressurisation as a weakening mechanisms in freshly fractured rock. © 2020 Elsevier B.V. |
| 关键词 | dilatancyearthquakesfault mechanicsfluid flow |
| 英文关键词 | Deformation; Drops; Earthquakes; Faulting; Gold deposits; Pressure drop; Rock mechanics; Slip forming; Stick-slip; dilatancy; Earthquake dynamics; Experimental evidence; Fault mechanics; Fluid pressure drop; Further deformations; Microstructural investigation; Quantitative prediction; Flow of fluids; coseismic process; deformation mechanism; earthquake damage; earthquake rupture; fluid flow; fluid pressure; ore deposit |
| 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/202507 |
| 作者单位 | Department of Earth Sciences, University College London, London, WC1E6BS, United Kingdom |
| 推荐引用方式 GB/T 7714 | Brantut N.. Dilatancy-induced fluid pressure drop during dynamic rupture: Direct experimental evidence and consequences for earthquake dynamics[J],2020,538. |
| APA | Brantut N..(2020).Dilatancy-induced fluid pressure drop during dynamic rupture: Direct experimental evidence and consequences for earthquake dynamics.Earth and Planetary Science Letters,538. |
| MLA | Brantut N.."Dilatancy-induced fluid pressure drop during dynamic rupture: Direct experimental evidence and consequences for earthquake dynamics".Earth and Planetary Science Letters 538(2020). |
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