CG-5重力仪格值系数对重力数据处理的影响
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摘要
以南天山重力测网内的3个绝对重力点作为平差基准,利用2015～2016年的流动重力观测资料对两台CG-5重力仪进行实测标定,并对实测标定前后的重力网平差结果进行比较。结果显示,实测标定的格值系数与基线场的标定结果差异较大,利用实测标定值得到的平差精度明显高于标定前,利用带有误差的格值系数进行平差计算会引入额外的系统误差;差分重力变化结果显示,标定后的重力变化量级明显减小。由此表明,利用测网实测数据标定重力仪的格值系数可以有效减弱格值系数误差对平差结果的影响,有利于消除重力场变化结果的虚假信息。
Three absolute gravimetric points in southern Tianshan gravity network are used as adjustment data,and repeated gravity data sets of 2015-2016 are used to calibrate two CG-5gravimeters.Then,the adjustment results before and after calibration are compared.The results show that the scale factor coefficient after calibration is significantly different than the initial value.The adjustment precision obtained by the calibration value is obviously higher than that using the initial value.Additional systematic errors are introduced by using the scale factor with error.Differentiated gravity change results show that gravity change obtained by the calibration value reduced significantly.The analysis shows that using observation data from the gravity network to calibrate the scale factor of gravimeters can reduce the influence of scale factor with error on the adjustment result effectively.It is therefore useful to eliminate the false information on gravity change.
Three absolute gravimetric points in southern Tianshan gravity network are used as adjustment data,and repeated gravity data sets of 2015-2016 are used to calibrate two CG-5gravimeters.Then,the adjustment results before and after calibration are compared.The results show that the scale factor coefficient after calibration is significantly different than the initial value.The adjustment precision obtained by the calibration value is obviously higher than that using the initial value.Additional systematic errors are introduced by using the scale factor with error.Differentiated gravity change results show that gravity change obtained by the calibration value reduced significantly.The analysis shows that using observation data from the gravity network to calibrate the scale factor of gravimeters can reduce the influence of scale factor with error on the adjustment result effectively.It is therefore useful to eliminate the false information on gravity change.
引文
[1] Zhu Y Z,Zhan F B,Zhou J C,et al.Gravity Measurements and Their Variations before the 2008 Wenchuan Earthquake[J].Bulletin of the Seismological Society of America,2010,100(5B):2 815-2 824
[2]祝意青,刘芳,李铁明,等.川滇地区重力场动态变化及其强震危险含义[J].地球物理学报,2015,58(11):4 187-4 196(Zhu Yiqing,Liu Fang,Li Tieming.et al.Dynamic Variation of the Gravity Field in the Sichuan-Yunnan Region and Its Implication for Seismic Risk[J].Chinese J Geophys,2015,58(11):4 187-4 196)
[3]祝意青,闻学泽,孙和平,等.2013年四川芦山MS7.0地震前的重力变化[J].地球物理学报,2013,56(6):1 887-1 894(Zhu Yiqing,Wen Xueze,Sun Heping,et al.Gravity Changes before the Lushan,Sichuan,Ms=7.0Earthquake of2013[J].Chinese J Geophys,2013,56(6):1 887-1 894)
[4]王同庆,陈石,梁伟锋,等.2016年门源Ms6.4地震前的区域重力场变化与定量参数分析[J].地震地质,2018,40(2):349-360(Wang Tongqing,Chen Shi,Liang Weifeng,et al.The Variation of Regional Gravity Field and Quantitative Parameter Analysis before 2016Menyuan Ms6.4Earthquake[J].Seismology and Geology,2018,40(2):349-360)
[5]邢乐林,李辉,夏正超,等.CG-5重力仪零漂特性研究[J].地震学报,2010,32(3):369-373(Xing Lelin,Li Hui,Xia Zhengchao,et al.Study on Zero Drift Characteristics of CG-5Gravimeter[J].Acta Seismologica Sinica,2010,32(3):369-373)
[6]汪健,孙少安,邢乐林,等.CG-5重力仪的漂移特征[J].大地测量与地球动力学,2016,36(6):556-559(Wang Jian,Sun Shaoan,Xing Lelin,et al.Drift Characteristics of CG-5Gravimeter[J].Journal of Geodesy and Geodynamics,2016,36(6):556-559)
[7]刘乃苓,江志恒.拉科斯特重力仪中长周期格值标定因子的选择[J].地壳形变与地震,1991,11(1):65-74(Liu Nailing,Jiang Zhiheng.On the Choice of the Scale Function Factors of LCR Gravimeter[J].Crustal Deformation and Earthquake,1991,11(1):65-74)
[8]郝洪涛,李辉,孙和平,等.CG-5重力仪零漂改正及格值系数检测应用研究[J].武汉大学学报:信息科学版,2016,41(9):1 265-1 271(Hao Hongtao,Li Hui,Sun Heping,et al.Application of Zero Drift Correct and Detection of Scale Parameters of CG-5Gravimeter[J].Geomatics and Information Science of Wuhan University,2016,41(9):1 265-1 271)
[9]冯建林,檀玉娟,秦建增,等.CG-5重力仪一次项格值系数对宁夏重力场变化的影响[J].大地测量与地球动力学,2017,37(3):319-322(Feng Jianlin,Tan Yujuan,Qin Jianzeng,et al.The Effect of One Degree Term of Chromatic Polynomial of CG-5Gravimeter on Gravity Change in Ningxia Area[J].Journal of Geodesy and Geodynamics,2017,37(3):319-322)
[10]国家地震局.地震重力测量规范[S].北京:地震出版社,1997(State Seismological Bureau.Seismological Gravimetric Standard[S].Beijing:Seismological Press,1997)
[11]郝洪涛,李辉,刘子维,等.基于重力差方法检测重力仪一次项格值系数变化[J].大地测量与地球动力学,2011,31(1):87-90(Hao Hongtao,Li Hui,Liu Ziwei,et al.Study on Change of Scale Parameters in Linear Term of Gravimeter with Gravity Difference Method[J].Journal of Geodesy and Geodynamics,2011,31(1):87-90)
[12]梁伟锋,刘芳,祝意青,等.重力仪一次项系数对重力场动态变化的影响研究[J].大地测量与地球动力学,2015,35(5):882-886.(Liang Weifeng,Liu Fang,Zhu Yiqing,et al.Research on the Effect of One Degree Term of Chromatic Polynomial of Gravimeter on Gravity on Dynamic Change[J].Journal of Geodesy and Geodynamics,2015,35(5):882-886)
[13]刘绍府,刘冬至,李辉.高精度重力测量平差及其软件[J].地震,1991(4):57-66(Liu Shaofu,Liu Dongzhi,Li Hui.Adjustment of High Precision Gravity Measurements and Its Software[J].Earthquake,1991(4):57-66)
[2]祝意青,刘芳,李铁明,等.川滇地区重力场动态变化及其强震危险含义[J].地球物理学报,2015,58(11):4 187-4 196(Zhu Yiqing,Liu Fang,Li Tieming.et al.Dynamic Variation of the Gravity Field in the Sichuan-Yunnan Region and Its Implication for Seismic Risk[J].Chinese J Geophys,2015,58(11):4 187-4 196)
[3]祝意青,闻学泽,孙和平,等.2013年四川芦山MS7.0地震前的重力变化[J].地球物理学报,2013,56(6):1 887-1 894(Zhu Yiqing,Wen Xueze,Sun Heping,et al.Gravity Changes before the Lushan,Sichuan,Ms=7.0Earthquake of2013[J].Chinese J Geophys,2013,56(6):1 887-1 894)
[4]王同庆,陈石,梁伟锋,等.2016年门源Ms6.4地震前的区域重力场变化与定量参数分析[J].地震地质,2018,40(2):349-360(Wang Tongqing,Chen Shi,Liang Weifeng,et al.The Variation of Regional Gravity Field and Quantitative Parameter Analysis before 2016Menyuan Ms6.4Earthquake[J].Seismology and Geology,2018,40(2):349-360)
[5]邢乐林,李辉,夏正超,等.CG-5重力仪零漂特性研究[J].地震学报,2010,32(3):369-373(Xing Lelin,Li Hui,Xia Zhengchao,et al.Study on Zero Drift Characteristics of CG-5Gravimeter[J].Acta Seismologica Sinica,2010,32(3):369-373)
[6]汪健,孙少安,邢乐林,等.CG-5重力仪的漂移特征[J].大地测量与地球动力学,2016,36(6):556-559(Wang Jian,Sun Shaoan,Xing Lelin,et al.Drift Characteristics of CG-5Gravimeter[J].Journal of Geodesy and Geodynamics,2016,36(6):556-559)
[7]刘乃苓,江志恒.拉科斯特重力仪中长周期格值标定因子的选择[J].地壳形变与地震,1991,11(1):65-74(Liu Nailing,Jiang Zhiheng.On the Choice of the Scale Function Factors of LCR Gravimeter[J].Crustal Deformation and Earthquake,1991,11(1):65-74)
[8]郝洪涛,李辉,孙和平,等.CG-5重力仪零漂改正及格值系数检测应用研究[J].武汉大学学报:信息科学版,2016,41(9):1 265-1 271(Hao Hongtao,Li Hui,Sun Heping,et al.Application of Zero Drift Correct and Detection of Scale Parameters of CG-5Gravimeter[J].Geomatics and Information Science of Wuhan University,2016,41(9):1 265-1 271)
[9]冯建林,檀玉娟,秦建增,等.CG-5重力仪一次项格值系数对宁夏重力场变化的影响[J].大地测量与地球动力学,2017,37(3):319-322(Feng Jianlin,Tan Yujuan,Qin Jianzeng,et al.The Effect of One Degree Term of Chromatic Polynomial of CG-5Gravimeter on Gravity Change in Ningxia Area[J].Journal of Geodesy and Geodynamics,2017,37(3):319-322)
[10]国家地震局.地震重力测量规范[S].北京:地震出版社,1997(State Seismological Bureau.Seismological Gravimetric Standard[S].Beijing:Seismological Press,1997)
[11]郝洪涛,李辉,刘子维,等.基于重力差方法检测重力仪一次项格值系数变化[J].大地测量与地球动力学,2011,31(1):87-90(Hao Hongtao,Li Hui,Liu Ziwei,et al.Study on Change of Scale Parameters in Linear Term of Gravimeter with Gravity Difference Method[J].Journal of Geodesy and Geodynamics,2011,31(1):87-90)
[12]梁伟锋,刘芳,祝意青,等.重力仪一次项系数对重力场动态变化的影响研究[J].大地测量与地球动力学,2015,35(5):882-886.(Liang Weifeng,Liu Fang,Zhu Yiqing,et al.Research on the Effect of One Degree Term of Chromatic Polynomial of Gravimeter on Gravity on Dynamic Change[J].Journal of Geodesy and Geodynamics,2015,35(5):882-886)
[13]刘绍府,刘冬至,李辉.高精度重力测量平差及其软件[J].地震,1991(4):57-66(Liu Shaofu,Liu Dongzhi,Li Hui.Adjustment of High Precision Gravity Measurements and Its Software[J].Earthquake,1991(4):57-66)