地面重力时空变化向卫星高度的解析延拓
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摘要
为研究卫星在不同高度对地面重力变化的检测能力,利用地面获得的重力场时间和空间变化,采用空间域向上解析延拓原理,将地面数据向上解析延拓到数百千米的不同高度。计算分析表明,如果地表存在93×10-8ms-2的重力变化量,在450km高度可观测到20×10-8ms-2的重力变化。所以利用卫星重力观测技术进行地震监测,其观测精度应优于20×10-8ms-2。
In order to study the detection ability of a satellite at different height to ground gravity change and according to space analytic continuation principle, this paper makes an upward continuation of the ground gravity change to the height of several hundred km. The result shows that if there is gravity change of 93×10+{-8}ms+{-2} on the ground, a change of 20×10+{-8}ms+{-2} can be observed at the height of 450 km, so the observation accuracy should less than 20×10+{-8}ms+{-2} when monitoring seismicity by satellite gravity observing technology.
In order to study the detection ability of a satellite at different height to ground gravity change and according to space analytic continuation principle, this paper makes an upward continuation of the ground gravity change to the height of several hundred km. The result shows that if there is gravity change of 93×10+{-8}ms+{-2} on the ground, a change of 20×10+{-8}ms+{-2} can be observed at the height of 450 km, so the observation accuracy should less than 20×10+{-8}ms+{-2} when monitoring seismicity by satellite gravity observing technology.
引文
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2许厚泽.重力观测在中国地壳运动观测网络中的作用[J].大地测量与地球动力学,2003,23(3):1～3.2XuHouze.FunctionofgravimetryinCMONOC[J].JournalofGeodesyandGeodynamics,2003,23(3):1-3.(inChinese)
3刘少明,申重阳,孙少安,等.三峡库首区重复重力资料的小波分解与构造活动[J].大地测量与地球动力学,2005,25(1):13～18.3LiuShaoming,ShenChongyang,SunShaoan,etal.Wave letdecompositionofrepeatedgravitydataandtectonicac tivitiesinfrontareaofThreeGorgesreservoir[J].Jour nalofGeodesyandGeodynamics,2005,25(1):13-18.(inChinese)
4申重阳,孙少安,刘少明,等.长江三峡库首区近期重力场动态变化[J].大地测量与地球动力学,2004,24(2):6～13.4ShenChongyang,SunShaoan,LiuShaoming,etal.Dy namicvariationsofgravityfieldinheadareaofThree Gorgesreservoirinrecentyears[J].JournalofGeodesy andGeodynamics,2004,24(2):6-13.(inChinese)
5付广裕,张勇军,刘少明.昆仑山口西8.1级大震前后重力场动态变化[J].大地测量与地球动力学,2003,23(1):42～46.5FuGuangyu,ZhangYongjun,LiuShaoming,etal.Dy namicgravitychangesbeforeandafterearthquakeof Ms8.1occurredinwesttoKunlunmountainpass[J].JournalofGeodesyandGeodynamics,2003,23(1):42-46.(inChinese)
6祝意青,胡斌,李辉,等.新疆地区重力变化与伽师6.8级地震[J].大地测量与地球动力学,2003,23(3):66～69.6ZhuYiqing,HuBin,LiHui,etal.Variationofgravity fieldofXinjiangareaandJiashiMs6.8earthquake[J].JournalofGeodesyandGeodynamics,2003,23(3):66-69.(inChinese)
7方盛明,张先康,嘉世旭,等.华北地区布格重力异常的多尺度分解特征与地震活动性[J].大地测量与地球动力学,2002,22(1):34～39.7FangShengming,ZhangXiankang,JiaShixu,etal.Multi scaledecompositionofBouguergravityanomalyandseis micactivityinNorthChina[J].JournalofGeodesyand Geodynamics,2002,22(1):34-39.(inChinese)
8郑洪,张洪魁,李国江,等.强震前重力场等位面二次偏微商异常变化分析[J].大地测量与地球动力学,2002,22(1):46～50.8ZhengHong,ZhangHongkui,LiGuojiang,etal.Analysis oftheanomalouschangeofquadraticpartialderivativeof gravityequi potentialsurfacepriortostrongearthquakes[J].JournalofGeodesyandGeodynamics,2002,22(1):46-50.(inChinese)
9刘善华,尹荣珍,李民,等.华北地区强震前地壳垂直形变和重力异常[J].大地测量与地球动力学,2002,22(3):34～39.9LiuShanhua,YinRongzhen,LiMin,etal.Resemblant characterofverticalcrustaldeformationandgravitya nomaliesbeforemacroseisminNorthChina[J].Journal ofGeodesyandGeodynamics,2002,22(3):34-39.(in Chinese)
10孙少安,项爱民,李辉.长江三峡库首区重力场变化与构造活动[J].大地测量与地球动力学,2002,22(3):56～59.10SunShaoan,XiangAiminandLihui.Changesofgravity fieldandtectonicactivityinfrontregionoftheThree Gorgesproject[J].JournalofGeodesyandGeodynam ics,2002,22(3):56-59.(inChinese)
11宁津生.卫星重力探测技术与地球重力场研究[J].大地测量与地球动力学,2002,22(1):1～5.11NingJinsheng.Thesatellitegravitysurveyingtechnolo gyandresearchofearth’sgravityfield[J].Journalof GeodesyandGeodynamics,2002,22(1):1-5.(inChi nese)
12孙文科.低轨道人造卫星(CHAMP、GRACE、GOCE)与高精度地球重力场———卫星重力大地测量的最新发展及其对地球科学的重大影响[J].大地测量与地球动力学,2002,22(1):92～100.12SunWenke.Satelliteinloworbit(CHAMP,GRACE,GOCE)andhighprecisionearthgravityfield———the latestprogressofsatellitegravitygeodesyanditsgreat influenceongeoscience[J].JournalofGeodesyandGeo dynamics,2002,22(1):92-100.(inChinese)
13许厚泽.卫星重力研究:21世纪大地测量研究的新热点[J].测绘科学,2001,26(3):1～3.13XuHouze.Theresearchofsatellitegravity:thenew hotpotintheresearchofgeodesyinthe21stcentury[J].TheScienceofSurveyingandMapping,2001,26(3):1-3.(inChinese)
14吴云,乔学军,周义炎.利用GPS探测震前电离层TEC异常[J].大地测量与地球动力学,2005,25(2):36～40.14WuYun,QiaoXuejunandZhouYiyan.Preseismicxion osphericTECanomalydetectedbyground basedGPS[J].JournalofGeodesyandGeodynamic,2005,25(2):36-40.(inChinese)
15管泽霖,宁津生.地球形状及外部重力场[M].北京:测绘出版社,1981.15GuanZelinandNingJinsheng.Earth’sshapeandexte riorgravityfield[M].Beijing:PressofSurveyingand Mapping,1981.(inChinese)
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17RobertTenzer.Far zonecontributiontoupwardcontin uationofgravityanomalies[J].RevistaBrasileirade CartografiaN55/02:48-54.
18李瑞浩.重力学引论[M].北京:地震出版社,1988.18LiRuihao.Introductionofgravimetry[M].Beijing:SeismologicalPress,1988.(inChinese)
19罗佳.利用卫星跟踪卫星确定地球重力场的理论和方法[D].武汉:武汉大学,2003.19LuoJia.Theoryandmethodologyofearthgravityfield determinationusingsatellite to satellitetracking[D].Wuhan:WuhanUniversity,2003.
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