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Observation and research of deep underground multi-physical fields—Huainan −848 m deep experiment

Compared with the surface, the deep environment has the advantages of allowing “super-quiet and ultra-clean”-geophysical field observation with low vibration noise and little electromagnetic interference, which are conducive to therealization of long-term and high-precision observation of multi-phys...

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Autores principales: Wang, Yun, Yang, Yaxin, Sun, Heping, Xie, Chengliang, Zhang, Qisheng, Cui, Xiaoming, Chen, Chang, He, Yongsheng, Miao, Qiangqiang, Mu, Chaomin, Guo, Lianghui, Teng, Jiwen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Science China Press 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9782270/
https://www.ncbi.nlm.nih.gov/pubmed/36575770
http://dx.doi.org/10.1007/s11430-022-9998-2
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author Wang, Yun
Yang, Yaxin
Sun, Heping
Xie, Chengliang
Zhang, Qisheng
Cui, Xiaoming
Chen, Chang
He, Yongsheng
Miao, Qiangqiang
Mu, Chaomin
Guo, Lianghui
Teng, Jiwen
author_facet Wang, Yun
Yang, Yaxin
Sun, Heping
Xie, Chengliang
Zhang, Qisheng
Cui, Xiaoming
Chen, Chang
He, Yongsheng
Miao, Qiangqiang
Mu, Chaomin
Guo, Lianghui
Teng, Jiwen
author_sort Wang, Yun
collection PubMed
description Compared with the surface, the deep environment has the advantages of allowing “super-quiet and ultra-clean”-geophysical field observation with low vibration noise and little electromagnetic interference, which are conducive to therealization of long-term and high-precision observation of multi-physical fields, thus enabling the solution of a series of geoscience problems. In the Panyidong Coal Mine, where there are extensive underground tunnels at the depth of 848 m belowsea level, we carried out the first deep-underground geophysical observations, including radioactivity, gravity, magnetic, magne-totelluric, background vibration and six-component seismic observations. We concluded from these measurements that (1) the background of deep subsurface gravity noise in the long-period frequency band less than 2 Hz is nearly two orders ofmagnitude weaker than that in the surface observation environment; (2) the underground electric field is obviously weaker thanthe surface electric field, and the relatively high frequency of the underground field, greater than 1 Hz, is more than two orders of magnitude weaker than that of the surface electric field; the east-west magnetic field underground is approximately the same asthat at the surface; the relatively high-frequency north-south magnetic field underground, below 10 Hz, is at least one order ofmagnitude lower than that at the surface, showing that the underground has a clean electromagnetic environment; (3) in additionto the high-frequency and single-frequency noises introduced by underground human activities, the deep underground spacehas a sig-nificantly lower background vibration noise than the surface, which is very beneficial to the detection of weakearthquake and gravity signals; and (4) the underground roadway support system built with ferromagnetic material interferesthe geomagnetic field. We also found that for deep observation in the “ultra-quiet and ultra-clean” environment, the existinggeophysical equipment and observation technology have problems of poor adaptability and insufficient precision as well asdata cleaning problems, such as the effective separation of the signal and noise of deep observation data. It is also urgent tointerpret and comprehensively utilize these high-precision multi-physics observation data. ELECTRONIC SUPPLEMENTARY MATERIAL: Supplementary material is available in the online version of this article at 10.1007/s11430-022-9998-2.
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spelling pubmed-97822702022-12-23 Observation and research of deep underground multi-physical fields—Huainan −848 m deep experiment Wang, Yun Yang, Yaxin Sun, Heping Xie, Chengliang Zhang, Qisheng Cui, Xiaoming Chen, Chang He, Yongsheng Miao, Qiangqiang Mu, Chaomin Guo, Lianghui Teng, Jiwen Sci China Earth Sci Research Paper Compared with the surface, the deep environment has the advantages of allowing “super-quiet and ultra-clean”-geophysical field observation with low vibration noise and little electromagnetic interference, which are conducive to therealization of long-term and high-precision observation of multi-physical fields, thus enabling the solution of a series of geoscience problems. In the Panyidong Coal Mine, where there are extensive underground tunnels at the depth of 848 m belowsea level, we carried out the first deep-underground geophysical observations, including radioactivity, gravity, magnetic, magne-totelluric, background vibration and six-component seismic observations. We concluded from these measurements that (1) the background of deep subsurface gravity noise in the long-period frequency band less than 2 Hz is nearly two orders ofmagnitude weaker than that in the surface observation environment; (2) the underground electric field is obviously weaker thanthe surface electric field, and the relatively high frequency of the underground field, greater than 1 Hz, is more than two orders of magnitude weaker than that of the surface electric field; the east-west magnetic field underground is approximately the same asthat at the surface; the relatively high-frequency north-south magnetic field underground, below 10 Hz, is at least one order ofmagnitude lower than that at the surface, showing that the underground has a clean electromagnetic environment; (3) in additionto the high-frequency and single-frequency noises introduced by underground human activities, the deep underground spacehas a sig-nificantly lower background vibration noise than the surface, which is very beneficial to the detection of weakearthquake and gravity signals; and (4) the underground roadway support system built with ferromagnetic material interferesthe geomagnetic field. We also found that for deep observation in the “ultra-quiet and ultra-clean” environment, the existinggeophysical equipment and observation technology have problems of poor adaptability and insufficient precision as well asdata cleaning problems, such as the effective separation of the signal and noise of deep observation data. It is also urgent tointerpret and comprehensively utilize these high-precision multi-physics observation data. ELECTRONIC SUPPLEMENTARY MATERIAL: Supplementary material is available in the online version of this article at 10.1007/s11430-022-9998-2. Science China Press 2022-12-19 2023 /pmc/articles/PMC9782270/ /pubmed/36575770 http://dx.doi.org/10.1007/s11430-022-9998-2 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Research Paper
Wang, Yun
Yang, Yaxin
Sun, Heping
Xie, Chengliang
Zhang, Qisheng
Cui, Xiaoming
Chen, Chang
He, Yongsheng
Miao, Qiangqiang
Mu, Chaomin
Guo, Lianghui
Teng, Jiwen
Observation and research of deep underground multi-physical fields—Huainan −848 m deep experiment
title Observation and research of deep underground multi-physical fields—Huainan −848 m deep experiment
title_full Observation and research of deep underground multi-physical fields—Huainan −848 m deep experiment
title_fullStr Observation and research of deep underground multi-physical fields—Huainan −848 m deep experiment
title_full_unstemmed Observation and research of deep underground multi-physical fields—Huainan −848 m deep experiment
title_short Observation and research of deep underground multi-physical fields—Huainan −848 m deep experiment
title_sort observation and research of deep underground multi-physical fields—huainan −848 m deep experiment
topic Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9782270/
https://www.ncbi.nlm.nih.gov/pubmed/36575770
http://dx.doi.org/10.1007/s11430-022-9998-2
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