淮南深部地球物理实验场重力噪声水平初步分析  

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

作　　者：张苗苗 陈晓东 徐建桥 崔小明 刘明 邢乐林 穆朝民[3] 孙和平 ZHANG Miaomiao;CHEN Xiaodong;XU Jianqiao;CUI Xiaoming;LIU Ming;XING Lelin;MU Chaomin;SUN Heping(Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430077,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Energy and Security,Anhui University of Science and Technology,Huainan Anhui 232001,China)

机构地区：[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

出　　处：《地球科学进展》2021年第5期500-509,共10页Advances in Earth Science

基　　金：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”(编号: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”(编号:41804078)资助。

摘　　要：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 m Hz(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.

关 键 词：深地观测 重力噪声水平 重力潮汐观测 Burris重力仪 LCR-ET20重力仪 

分 类 号：P312.1[天文地球—固体地球物理学]