一种基于地震噪声等级的陆地重力观测资料评价方法

龚立卓, 陈石, 徐伟民

龚立卓, 陈石, 徐伟民. 2019: 一种基于地震噪声等级的陆地重力观测资料评价方法. 地震学报, 41(1): 57-68. DOI: 10.11939/jass.20180068
引用本文: 龚立卓, 陈石, 徐伟民. 2019: 一种基于地震噪声等级的陆地重力观测资料评价方法. 地震学报, 41(1): 57-68. DOI: 10.11939/jass.20180068
Gong Lizhuo, Chen Shi, Xu Weimin. 2019: An evaluation approach for the terrestrial gravity measurement based on the seismic noise magnitude. Acta Seismologica Sinica, 41(1): 57-68. DOI: 10.11939/jass.20180068
Citation: Gong Lizhuo, Chen Shi, Xu Weimin. 2019: An evaluation approach for the terrestrial gravity measurement based on the seismic noise magnitude. Acta Seismologica Sinica, 41(1): 57-68. DOI: 10.11939/jass.20180068

一种基于地震噪声等级的陆地重力观测资料评价方法

基金项目: 中国地震局地球物理研究所基本科研业务专项(DQJB18B02,DQJB16A05)、川滇国家地震监测预报实验场项目(2016CESE0202)和国家自然科学基金(41774090)联合资助
详细信息
    通讯作者:

    陈石: e-mail: chenshi@cea-igp.ac.cn

  • 中图分类号: P3

An evaluation approach for the terrestrial gravity measurement based on the seismic noise magnitude

  • 摘要: 本文选取GS-15型、gPhone型、PET型和CG-5型等4种陆地重力观测常用的相对重力仪,对比这几种仪器在不同背景观测环境下和不同测评时长的地震噪声等级计算结果。综合分析结果显示:金属弹簧(gPhone型、GS-15型、PET型)与石英弹簧型(CG-5型)重力仪对环境噪声的敏感性存在一定差异,但取测评时长中最平静5天和最平静1天数据所计算的地震噪声等级结果相近。因此,对于流动重力观测点,可以取最平静1天的数据来评价观测点的环境噪声水平和观测精度,可为流动重力测点选址提供方法支撑。
    Abstract: In this paper, we calculated the seismic noise magnitude (SNM) of four types of relative gravimeters (GS-15, gPhone, PET and CG-5) commonly used in terrestrial gravity measurement in different environments and time intervals, and compared the corresponding results. The results show that there is quite different in sensitivity to ambient noise for the metallic spring gravimeter (GS-15, gPhone, PET) and quartz spring gravimeter (CG-5). The SNM results are similar using the data of the quietest five-day or quietest one-day to evaluate. Therefore, it is feasible to use the quietest one-day recording to evaluate SNM value and observation precision. This result could provide a method for evaluating the conditions of the campaigned gravity survey station.
  • 图  1   中国地壳运动观测网络连续重力台站分布

    Figure  1.   The distribution of crustal movement observation network of china gravity station

    图  2   不同台站在2008—2011年最平静5天的重力功率谱密度PSD观测结果

    Figure  2.   The PSD of the quietest five days gravity data from 2008 to 2011

    图  3   CG-5型重力仪(No.1095)连续46天重力观测的预处理结果

    Figure  3.   The preliminary results of gravity continuously recorded by the CG-5 gravimeter (No.1095) in 46 days

    图  4   2017年7月6日—8月20日No.1095 (a)和No.1098 (b) CG-5型重力仪观测中最平静5天和1天的同址重力观测PSD结果

    Figure  4.   The PSD of the quietest 5-day and 1-day gravity data recordings by the CG-5 gravimeters No.1095 (a) and No.1098 (b) from 6 July 2017 to 20 August 2017 at the same station

    图  5   2018年4月28日—5月8日白家疃台No.1095 (a)和No.1098 (b) CG-5型石英弹簧重力仪重力观测预处理结果

    Figure  5.   The preliminary results of gravity recorded by CG-5 gravimeter No.1095 (a) and No.1098 (b) from 28 April 2017 to 8 May 2017 at the Baijiatuan station

    图  6   2018年4月28日—5月8日白家疃台No.1095(a)和No.1098(b) CG-5型重力仪观测中最平静5天和1天的重力观测PSD结果

    Figure  6.   The PSD of the quietest five-day and one-day gravity data by the CG-5 gravimeter No. 1095 (a) and No. 1098 (b) in Baijiatuan station from 28 April 2018 to 8 May 2018

    图  7   2018年4月28日—5月8日白家疃台gPhone型重力观测预处理结果

    Figure  7.   The gravity observation recorded by the gravimeter gPhone at Baijiatuan station from 28 April 2018 to 8 May 2018

    图  8   2018年4月28日—5月8日白家疃台gPhone型金属弹簧重力仪取观测时最平静5天和1天的重力观测PSD结果

    Figure  8.   The PSD of the quietest 5-day and 1-day gravity data at Baijiatuan station from 28 April 2018 to 8 May 2018

    表  1   2008—2011年南山、乌加河和琼中重力台站记录的PSD,SNM和PL

    Table  1   The PSD,SNM and PL of Nanshan station,Wujiahe station and Qiongzhong station from 2008 to 2011

    台站 仪器类型 数据年份 PSD/[(10−8 m·s−22·Hz−1] SNM/[(10−8 m·s−22·Hz−1] PL /[(10−8 m·s−22·(Hz·s)−1/3]
    南山台 GS-15 2008 0.982 2.492 0.025
    2009 3.938 3.095 0.073
    2010 0.640 2.306 0.032
    2011 0.977 2.490 0.047
    2008—2011 1.126 2.551 0.037
    乌加河台 gPhone 2008 10.273 3.511 0.108
    2009 2.113 2.825 0.047
    2010 4.274 3.130 0.030
    2011 4.460 3.149 0.070
    2008—2011 2.519 2.901 0.048
    琼中台 PET 2008 39.686 4.098 0.275
    2009 80.150 4.403 0.187
    2010 153.434 4.685 0.223
    2011 71.240 4.352 0.192
    2008—2011 76.493 4.383 0.197
    下载: 导出CSV

    表  2   两台CG-5型重力仪2017年7月6日—8月20日期间的同址PSD,SNM和PL

    Table  2   The result of PSD,SNM and PL recording by two CG-5 gravimeters from 6 July 2017 to 20 August 2017 at the same station

    仪器编号 取样天数 PSD/[(10−8 m·s−22·Hz−1] SNM/[(10−8 m·s−22·Hz−1] PL/[(10−8 m·s−22·(Hz·s)−1/3]
    No.1095 1 299.555 4.976 0.879
    5 273.553 4.937 0.785
    No.1098 1 45.449 4.157 0.359
    5 42.705 4.130 0.335
    下载: 导出CSV

    表  3   2018年4月28日—5月8日白家疃台重力仪观测的PSD,SNM和PL

    Table  3   The PSD,SNM and PL of Baijiatuan station from 28 April 2018 to 8 May 2018

    仪器型号 取样天数 PSD/[(10−8 m·s−22·Hz−1] SNM/[(10−8 m·s−22·Hz−1] PL/[(10−8 m·s−22·(Hz·s)−1/3]
    CG-5 (No.1095) 1 478.755 5.180 1.747
    5 523.303 5.221 1.810
    CG-5 (No.1098) 1 60.117 4.279 0.317
    5 45.611 4.159 0.316
    gPhone 1 6.255 3.296 0.110
    5 6.073 3.283 0.085
    下载: 导出CSV

    表  4   白家疃台和中国地震局地球物理研究所地下观测室重力数据的PSD,SNM和PL

    Table  4   The PSD,SNM and precisionPL at the Institute of Geophysics station and the Baijiatuan station

    测点 仪器 最平静
    时段
    RMS
    /[(10−8 m·s−22·Hz−1]
    SNM
    /[(10−8 m·s−22·Hz−1]
    PL
    /[10−8 m·s−22·(Hz·s)−1/3]
    白家疃台 gPhone 第1天 6.715 3.273 0.060
    第6天 6.646 3.638 0.110
    第8天 5.504 3.313 0.070
    第9天 5.072 3.284 0.080
    第10天 4.351 3.296 0.110
    白家疃台 CG-5
    (No. 1095)
    第4天 9.386 5.052 1.620
    第7天 9.300 5.491 2.220
    第8天 8.156 5.227 1.815
    第9天 7.554 5.180 1.747
    第10天 7.614 5.473 2.195
    中国地震局地球
    物理研究所
    CG-5
    (No. 1095)
    第11天 5.195 5.050 0.631
    第23天 6.236 5.117 0.911
    第24天 5.981 5.021 0.864
    第25天 6.076 4.930 0.829
    第26天 4.921 4.976 0.879
    下载: 导出CSV

    表  6   弹簧重力仪的计算结果

    Table  6   The result of spring type gravimeters

    台站 仪器 PSD
    /[(10−8 m·s−22·Hz−1]
    SNM
    /[(10−8 m·s−22·Hz−1]
    d
    /[10−12 m·s−2·s−1]
    Tobs
    /min
    PL
    /[(10−8 m·s−22·(Hz·s)−1/3]
    乌加河台 gPhone 2.511 2.9 0.442 18.1 0.04
    白家疃台 CG-5 (No.1098) 45.611 4.1 6.940 7.6 0.32
    白家疃台 gPhone 6.067 3.2 1.030 13.7 0.08
    下载: 导出CSV

    表  5   弹簧重力仪的精度估计(Crossley et al,2013

    Table  5   Precision estimates of spring type gravimeters (Crossley et al,2013

    仪器 PSD/[(10−8 m·s−22·Hz−1] SNM/[(10−8 m·s−22·Hz−1] d/[10−12 m·s−2·s−1] Tobs/min PL/[(10−8 m·s−22·(Hz·s)−1/3]
    gPhone-2 50.126 4.2 34.70 2.7 0.56
    CG-5 31.584 4.0 3.47 10.7 0.22
    gPhone-1 4.000 3.1 11.60 11.1 0.08
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-05-27
  • 修回日期:  2018-06-28
  • 网络出版日期:  2019-01-16
  • 发布日期:  2018-12-31

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