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

作者：Yun Wang, Yaxin Yang, Heping Sun, Chengliang Xie, Qisheng Zhang, Xiaoming Cui, Chang Chen, Yongsheng He, Qiangqiang Miao, Chaomin Mu, Lianghui Guo, Jiwen Teng · 发表于：Science China Earth Sciences · 年份：2022 · DOI：10.1007/s11430-022-9998-2 · 被引用次数：13 · 研究领域：Earthquake Detection and Analysis、Geophysical and Geoelectrical Methods、Seismic Waves and Analysis

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-f...