气候变化领域集成服务门户(CCPortal): Microseismic Events Cause Significant pH Drops in Groundwater

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DOI	10.1029/2020GL089885
	Microseismic Events Cause Significant pH Drops in Groundwater
	Stillings M.; Lunn R.J.; Pytharouli S.; Shipton Z.K.; Kinali M.; Lord R.; Thompson S.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	Earthquakes cause rock fracturing, opening new flow pathways which can result in the mixing of previously isolated geofluids with differing geochemistries. Here, we present the first evidence that seismic events can significantly reduce groundwater pH without the requirement for fluid mixing, solely through the process of dynamic rock fracturing. At the Grimsel Test Site, Switzerland, we observe repeated, short-lived groundwater pH drops of 1–3.5 units, while major and minor ion groundwater concentrations remain constant. Acidification coincides with reservoir drainage and induced microseismic events. In laboratory experiments, we demonstrate that fresh rock surfaces made by particle cracking interact with the in situ water molecules, likely through creation of surface silanols and silica radicals, increasing the H+ concentration and significantly lowering groundwater pH. Our findings are significant; pH exerts a fundamental control on the rate and outcome of most aqueous geochemical reactions and microseismic events are commonplace, even in seismically inactive regions. © 2020. The Authors.
英文关键词	Drops; Fracturing (fossil fuel deposits); Geochemistry; Mixing; Molecules; Reservoirs (water); Seismology; Silica; Dynamic rock fracturing; Fundamental control; Geochemical reaction; Grimsel test site; Groundwater concentrations; In-laboratory experiments; Microseismic events; Particle-cracking; Groundwater
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169166
作者单位	Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, United Kingdom; Radioactive Waste Management Ltd., Oxfordshire, United Kingdom
推荐引用方式 GB/T 7714	Stillings M.,Lunn R.J.,Pytharouli S.,et al. Microseismic Events Cause Significant pH Drops in Groundwater[J],2021,48(2).
APA	Stillings M..,Lunn R.J..,Pytharouli S..,Shipton Z.K..,Kinali M..,...&Thompson S..(2021).Microseismic Events Cause Significant pH Drops in Groundwater.Geophysical Research Letters,48(2).
MLA	Stillings M.,et al."Microseismic Events Cause Significant pH Drops in Groundwater".Geophysical Research Letters 48.2(2021).