地球科学进展 ›› 2021, Vol. 36 ›› Issue (5): 500 -509. doi: 10.11867/j.issn.1001-8166.2021.033

研究论文 上一篇    下一篇

淮南深部地球物理实验场重力噪声水平初步分析
张苗苗 1( ), 陈晓东 1 , 2( ), 徐建桥 1, 崔小明 1, 刘明 1, 邢乐林 1, 穆朝民 3, 孙和平 1 , 2   
  1. 1.中国科学院精密测量科学与技术创新研究院,湖北 武汉 430077
    2.中国科学院大学,北京 100049
    3.安徽理工大学能源与安全学院,安徽 淮南 232001
  • 收稿日期:2020-12-29 修回日期:2021-03-25 出版日期:2021-06-18
  • 通讯作者: 陈晓东 E-mail:zhangmm@whigg.ac.cn;chenxd@whigg.ac.cn
  • 基金资助:
    中国科学院战略性先导科技专项(B类)“类地行星的形成演化及其宜居性”(XDB41000000);国家自然科学基金青年科学基金项目“陆态网络连续重力台站背景噪声模型构建及其应用”(41804078)

A Preliminary Analysis of Gravity Noise Levels at the Deep Geophysical Experimental Field in Huainan

Miaomiao ZHANG 1( ), Xiaodong CHEN 1 , 2( ), Jianqiao XU 1, Xiaoming CUI 1, Ming LIU 1, Lelin XING 1, Chaomin MU 3, Heping SUN 1 , 2   

  1. 1.Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430077,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.Department of Energy and Security,Anhui University of Science and Technology,Huainan Anhui 232001,China
  • Received:2020-12-29 Revised:2021-03-25 Online:2021-06-18 Published:2021-07-02
  • Contact: Xiaodong CHEN E-mail:zhangmm@whigg.ac.cn;chenxd@whigg.ac.cn
  • About author:ZHANG Miaomiao (1986-), female, Longyao County, Hebei Province, Postdoctor. Research areas include noise analysis of continuous tidal gravity observations and its geodynamic application. E-mail: zhangmm@whigg.ac.cn
  • Supported by:
    the Strategic Priority Research Program of Chinese Academy of Sciences "Formation, evolution and habitability of terrestrial planets"(XDB41000000);The National Natural Science Foundation of China "Construction of the background noise model of continuous gravity stations of CMONOC and its applications"(41804078)

利用淮南深部地球物理实验场地下848 m巷道内的Burris弹簧重力仪和地表LCR-ET20弹簧重力仪同期连续重力潮汐观测资料,对实验场地表和地下重力噪声水平进行了初步分析。分析结果表明在频率小于1.70 mHz(对应周期约为9.8 min)时,地下重力噪声水平都要比地表低;特别是在重力仪敏感的信号频段(周期大于3 h的信号频段),地下848 m巷道内的重力噪声水平要比地表低约2个数量级,充分验证了实验场地下观测环境具有低重力噪声水平的超静特点。实验结果证明淮南深部地球物理实验场地下848 m巷道可为深地多物理场观测提供超静观测环境,为检测微弱地球物理场信号提供绝佳观测条件。

Utilizing simultaneously continuous tidal gravity observations from a Burris spring gravimeter in the -848 m deep tunnel and a LCR-ET20 spring gravimeter, surficial and underground gravity noise levels at the deep geophysical experimental field in Huainan were preliminarily analysed. Analysis results show that the underground gravity noise level is lower than the surficial noise level below 1.7 mHz (period about 9.8 min); especially in the gravimeter senstive frequency band (period over 3 h), the underground gravity noise level is lower by two orders of magnititude, which fully demonstrates the low noise of ungerground environment at the deep geophysical experimental field in Huainan. Our results further indicate that the -848 m deep tunnel can provide both an ultra quiet environment for deep multi-physical fields observations and a perfect condition for the detection of weak geophysical signals.

中图分类号: 

图1 淮南观测台站位置示意图
Fig.1 Location of Huainan observatory
图1 淮南观测台站位置示意图
Fig.1 Location of Huainan observatory
图2 矿井概况及测点位置示意图
Fig.2 General situation of the mine and locations of observation points
图2 矿井概况及测点位置示意图
Fig.2 General situation of the mine and locations of observation points
表1 BurrisLCR-ET20重力仪的仪器性能
Table 1 Performance specifications of Burris and LCR-ET20 spring gravimeters
表1 BurrisLCR-ET20重力仪的仪器性能
Table 1 Performance specifications of Burris and LCR-ET20 spring gravimeters
图3 BurrisLCR-ET20重力仪原始观测数据
Fig.3 Original observations of Burris and LCR-ET20 spring gravimeters
图3 BurrisLCR-ET20重力仪原始观测数据
Fig.3 Original observations of Burris and LCR-ET20 spring gravimeters
图4 BurrisLCR-ET20重力仪2020119~27日的功率谱
Fig.4 PSD of Burris and LCR-ET20 spring gravimeters for 19~27 January 2020
图4 BurrisLCR-ET20重力仪2020119~27日的功率谱
Fig.4 PSD of Burris and LCR-ET20 spring gravimeters for 19~27 January 2020
图5 BurrisLCR-ET20重力仪的平均功率谱
Fig.5 Mean PSDs for Burris and LCR-ET20 spring gravimeters
图5 BurrisLCR-ET20重力仪的平均功率谱
Fig.5 Mean PSDs for Burris and LCR-ET20 spring gravimeters
图6 BurrisLCR-ET20重力仪平均功率谱之比及其拟合曲线
Fig.6 The mean PSD ratio of Burris to LCR-ET20 and its fitted curve
图6 BurrisLCR-ET20重力仪平均功率谱之比及其拟合曲线
Fig.6 The mean PSD ratio of Burris to LCR-ET20 and its fitted curve
图7 淮南实验场与邻近连续重力台站空间分布图
HN:淮南;HB:淮北;LY:溧阳;XF:襄樊;WH:武汉
Fig.7 Locations of Huainan geophysical experimental
fieldand other adjacent continuous gravity stations
HN: Huainan;HB: Huaibei; LY: Liyang; XF: Xiangfan; WH:Wuhan
图7 淮南实验场与邻近连续重力台站空间分布图
HN:淮南;HB:淮北;LY:溧阳;XF:襄樊;WH:武汉
Fig.7 Locations of Huainan geophysical experimental
fieldand other adjacent continuous gravity stations
HN: Huainan;HB: Huaibei; LY: Liyang; XF: Xiangfan; WH:Wuhan
表2 淮南实验场与邻近连续重力台站重力观测资料
Table 2 The circumstances and observations of Huainan geophysical experimental field and other adjacent continuous gravity stations
表2 淮南实验场与邻近连续重力台站重力观测资料
Table 2 The circumstances and observations of Huainan geophysical experimental field and other adjacent continuous gravity stations
图8 淮南实验场Burris/LCR-ET20重力噪声水平与邻近重力台站噪声水平比较
Fig.8 Gravity noise level comparison between Burris/LCR-ET20 at Huainan geophysical experimental field and other gravimeters at adjacent gravity stations
图8 淮南实验场Burris/LCR-ET20重力噪声水平与邻近重力台站噪声水平比较
Fig.8 Gravity noise level comparison between Burris/LCR-ET20 at Huainan geophysical experimental field and other gravimeters at adjacent gravity stations
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