弹簧式连续重力观测非线性漂移影响因素分析
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摘要
利用姑咱地震台超过3年半的连续重力观测资料、降雨数据、地下水位资料和全球陆地水模型观测资料,采用多项式拟合和相关分析研究弹簧重力仪非线性漂移特征与外界因素干扰的关系。结果表明:姑咱地震台DZW型重力仪长期连续重力观测的漂移具有明显的线性特征(约1 200×10-8ms-2/a),并且在人员进洞调整仪器时还会产生非线性漂移。在考虑固体潮、气压潮和极潮的影响后,利用多项式分段进行非线性漂移改正,重力残差变化量级为±(10～15)×10-8ms-2,而且3年间4次雨季都同步有明显的重力正异常变化相对应。研究不仅揭示了弹簧重力仪的非线性漂移与外界影响因素的关系,同时也为改正漂移与排除水负荷对重力的干扰提供了新的分析和处理方法。
More than 3 years gravity data recorded at Guza seismostation using DZW gravimeter are analyzed along with ground water,precipitation and two global continental water storage models(GLDAS,CPC).It is shown that the linear drift of the instrument is about 1 200×10-8ms-2/a stablely.Furthermore,after artificial disturbance(such as power interrupt,re-start,lightning),the instrument drift is inconsistent with the previous,so called non-linear drift that is different from linear drift.Corrected with polynomial fitting method considering the barth tide,air pressure and polar tides,the gravity residual is ±(10-15)×10-8ms-2 and shows 4 gravity anomalous variations synchronous with the precipitation for 3 years.So,this research indicates that the drift rule of spring gravity for long time and supply a new method for correcting drift and obstaining gravity variations affected by water loading.
More than 3 years gravity data recorded at Guza seismostation using DZW gravimeter are analyzed along with ground water,precipitation and two global continental water storage models(GLDAS,CPC).It is shown that the linear drift of the instrument is about 1 200×10-8ms-2/a stablely.Furthermore,after artificial disturbance(such as power interrupt,re-start,lightning),the instrument drift is inconsistent with the previous,so called non-linear drift that is different from linear drift.Corrected with polynomial fitting method considering the barth tide,air pressure and polar tides,the gravity residual is ±(10-15)×10-8ms-2 and shows 4 gravity anomalous variations synchronous with the precipitation for 3 years.So,this research indicates that the drift rule of spring gravity for long time and supply a new method for correcting drift and obstaining gravity variations affected by water loading.
引文
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13张锐,等.用SGC053超导重力仪观测资料对gPh058重力仪格值的精密测定[J].大地测量与地球动力学,2011,(5):151-155.(Zhang Rui,et al.Accurate de-termination of scale value of gPh058 gravimeter by use ofobservations with SGC053 superconducting gravimeter[J].Journal of Geodesy and Geodynamics,2011,(5):151-155)
14孙文科,等.高斯滤波在处理GRACE数据中的模拟研究:西藏的重力变化[J].中国科学(地球科学),2011,41(9):1327-1333.(Sun Wenke,et al.Effects ofGaussian filter in processing GRACE data:Gravity rate ofchange at Lhasa,southern Tibet[J].Sci China EarthSci.,2011,54:1 378-1 385,doi:10.1007/s11430-011-4233-y.
15周江存,孙和平,徐建桥.用地表和空间重力测量验证全球水储量变化模型[J].科学通报,2009,54(9):1 282-1 289.(Zhou Jiangcun,Sun Heping and Xu Jian-qiao.Validating global hydrological models by ground andspace gravimeter[J].Chinese Science Bulletin,2009,54(9):1282-1289)
2 Sun Wenke,et al.A reinvestigation of crustal thickness inthe Tibetan plateau using absolute gravity,GPS and GRACEdata[J].Terr.Atmos.Ocean,2011,22(2):109-119.
3 Sun Heping,et al.Precise tidal gravity recorded with super-conducting gravimeters at station Wuhan(China)and Kyoto(Japan)[J].Journal of Geodesy,2001,74:720-729.
4韦进,等.日本Mw9.0地震前的连续重力观测异常[J].大地测量与地球动力学,2011,(2):9-11.(Wei Jin,et al.Gravity anomalies in before Mw9.0 earthquake in Ja-pan observed by continuous relative gravimeter in China[J].Journal of geodesy and geodynamics,2011,31(2):9-11)
5刘子维,等.日本Mw9.0地震前的重力高频扰动[J].大地测量与地球动力学,2011,(2):4-8.Liu Ziwei,etal.Pre-seismic gravity disturbance of high frequency beforeMw9.0 earthquake in Japan[J].Journal of Geodesy andGeodynamics,2011,31(2):4-8)
6 Riccardi U,Rosat S and Hinderer J.Comparison of the Mi-cro-g LaCoste gPhone-054 spring gravimeter and the GWR-C026 superconducting gravimeter in Strasbourg(France)u-sing a 300-day time series[J].Metrologia,2011,48:28-39.
7 Kang Kaixuan,et al.Seasonal variations in hydrological in-fluences on gravity measurements using gPhone[J].Terr At-mos Ocean.,2011,(22):157-168.
8邢乐林,等.CG-5重力仪零漂特性研究[J].地震学报,2010,32(3):369-373.(Xing Lelin,et al.Study on zerodrift characteristics of CG-5 gravimeter[J].Acta Seismolog-ica Sinica,2010,32(2):369-373)
9刘子维,等.SG-053超导重力仪的观测结果分析[J].大地测量与地球动力学,2010,(6):157-160.(Liu Zi-wei,et al.Analysis of observations of superconducting gra-vimeter SG-053[J].Journal of Geodesy and Geodynamics,2010,(6):157-160)
10徐建桥.重力固体潮汐理论及分析方法———武汉台超导重力仪观测资料的分析处理[D].中国科学院测量与地球物理研究所,1997.(Xu Jianqiao.The theory and a-nalysis of gravity tidal-superconducting gravimeter data a-nalysis and processing in Wuchang station[D].Institute ofGeodesy and Geophysics Chinese Academy of Sciences,1997)
11田桂娥,等.VAV和ETERNA潮汐分析方法的比较和研究[J].大地测量与地球动力学,2009,(2):96-99.(Tian Guie,et al.Comparison and investigation ofVAV and ETERNA tidal analysis methods[J].Journal ofGeodesy and Geodynamics,2009,(2):96-99)
12韦进,等.超导重力观测噪声水平的极大似然估计[J].大地测量与地球动力学,2011,(3):69-74.(Wei Jin,et al.Noise level measurement of SG-053 withMLE[J].Journal of Geodesy and Geodynamics,2011,(3):69-74)
13张锐,等.用SGC053超导重力仪观测资料对gPh058重力仪格值的精密测定[J].大地测量与地球动力学,2011,(5):151-155.(Zhang Rui,et al.Accurate de-termination of scale value of gPh058 gravimeter by use ofobservations with SGC053 superconducting gravimeter[J].Journal of Geodesy and Geodynamics,2011,(5):151-155)
14孙文科,等.高斯滤波在处理GRACE数据中的模拟研究:西藏的重力变化[J].中国科学(地球科学),2011,41(9):1327-1333.(Sun Wenke,et al.Effects ofGaussian filter in processing GRACE data:Gravity rate ofchange at Lhasa,southern Tibet[J].Sci China EarthSci.,2011,54:1 378-1 385,doi:10.1007/s11430-011-4233-y.
15周江存,孙和平,徐建桥.用地表和空间重力测量验证全球水储量变化模型[J].科学通报,2009,54(9):1 282-1 289.(Zhou Jiangcun,Sun Heping and Xu Jian-qiao.Validating global hydrological models by ground andspace gravimeter[J].Chinese Science Bulletin,2009,54(9):1282-1289)
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