气候变化领域集成服务门户(CCPortal): Low-Magnitude Seismicity With a Downhole Distributed Acoustic Sensing Array—Examples From the FORGE Geothermal Experiment

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DOI	10.1029/2020JB020462
	Low-Magnitude Seismicity With a Downhole Distributed Acoustic Sensing Array—Examples From the FORGE Geothermal Experiment
	Lellouch A.; Schultz R.; Lindsey N.J.; Biondi B.L.; Ellsworth W.L.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	We show the capabilities of a downhole distributed acoustic sensing (DAS) array in detecting, locating, and characterizing low-magnitude earthquakes occurring in the vicinity of the Frontier Observatory for Research in Geothermal Energy (FORGE) site in Utah. Continuous data for 10.5 days were acquired in a monitoring well at the FORGE geothermal site during the initial stimulation of an enhanced geothermal system in April–May 2019. Earthquake activity beneath Mineral Mountains, Utah also occurred within 10 km of the FORGE monitoring well. During the experiment, four earthquakes were cataloged by routine processing of the University of Utah Seismograph Stations. Our processing of DAS data finds 77 earthquakes during that period, of which 16 are visible on the regional network. Five additional events are found by template matching DAS data. The magnitude of completeness obtained by DAS processing is better by at least M = 0.5 than the dense surface array around the FORGE site. Depth estimation using DAS is more reliable than using a surface array. While a single vertical DAS array is limited in terms of event location due to its azimuthal ambiguity, multiple DAS wells or a combination of a downhole array with surface stations or near-surface horizontal DAS could jointly resolve locations. All detected events probably originated from the two active source areas, located 3–5 and 8–10 km away from the FORGE site, respectively. Recorded events can be reliably clustered into several distinct families thanks to the spatial density and large number of DAS channels. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	DAS; detection; downhole; fiber; geothermal; microearthquakes
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/187402
作者单位	Department of Geophysics, Stanford University, StanfordCA, United States
推荐引用方式 GB/T 7714	Lellouch A.,Schultz R.,Lindsey N.J.,等. Low-Magnitude Seismicity With a Downhole Distributed Acoustic Sensing Array—Examples From the FORGE Geothermal Experiment[J],2021,126(1).
APA	Lellouch A.,Schultz R.,Lindsey N.J.,Biondi B.L.,&Ellsworth W.L..(2021).Low-Magnitude Seismicity With a Downhole Distributed Acoustic Sensing Array—Examples From the FORGE Geothermal Experiment.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Lellouch A.,et al."Low-Magnitude Seismicity With a Downhole Distributed Acoustic Sensing Array—Examples From the FORGE Geothermal Experiment".Journal of Geophysical Research: Solid Earth 126.1(2021).