云南垂线的年际变化——天体测量和重力测定资料的比较研究
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摘要
对 1 98 5～ 1 997年期间云南重力网测定的云南垂线变化资料 ,与同期云南天文台光电等高仪所测定的时间纬度残差中的垂线变化进行了比较 ,结果表明 ,由这两种技术得到的云南垂线的年际变化符合得很好 ,年际变化的振幅约为 0 .0 0 2″ ,说明强烈地震前时纬残差异常是真实的 ,反映了垂线的异常变化 ,同时证实了用这两种技术测定垂线变化的可行性
The plumb line variation(PLV) in Yunnan Province during 1985-1997 measured by gravimetric network in the province is compared with that in time latitude residuals measured by photoelectric astrolabe in Yunan Observatory. The result indicates that the interannual PLV of 0.002" obtained from the gravimetric technique are in a good accordance with the correspondent component in the time and latitude residuals derived from the astrometric observations. This fact shows once again the evidence with which one may recognize the reality of the interannual variations of the plumb line at Yunnan Province and the ability of the two techniques in measuring PLV in practice.
The plumb line variation(PLV) in Yunnan Province during 1985-1997 measured by gravimetric network in the province is compared with that in time latitude residuals measured by photoelectric astrolabe in Yunan Observatory. The result indicates that the interannual PLV of 0.002" obtained from the gravimetric technique are in a good accordance with the correspondent component in the time and latitude residuals derived from the astrometric observations. This fact shows once again the evidence with which one may recognize the reality of the interannual variations of the plumb line at Yunnan Province and the ability of the two techniques in measuring PLV in practice.
引文
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[2] 方俊.固体潮[M ].北京:科学出版社,1984.
[3] 李辉,付广裕,李正心.重复重力测量结果计算垂线篇差的时间变化[J].地震学报,2001,23(1):61-67.
[4] 胡辉,李东明,李永生,王锐,李晓明.ThephotoelectricastrolabecatalogueofYunnanObservatory(YPAC)[J].Astron.Astrphys.118,(sup pl.):239-241(1996).
[5] 胡辉,王锐,李晓明.Opticalpositionsof44radiostarsfromastrolabeobservations[J].TheAstronomicalJournal,1999,117:3066-3069.
[6] 韩延本.Relationshipbetweenresidualanomaliesoftime latitudeandearthquakes[J].ChineseScienceBull.1993,38(4):303-307.
[7] 韩延本.Howtouseastronomicaltime latitudeobservationforprovidinginformationofearthquakeprcdiction[J].AstrophysicsReports,1998,(32):75-79.
[8] 胡辉,阚荣举,王锐,蔡昕,陈翠仙.Amethodforpredictingastrongearthquakebymeansofastrometricobservations[J].Astron.Astrophys.,1989,(224):321-322.
[9] 阚荣举,胡辉.云南及其周邻大地震与云南天文台时纬残差变化[J].中国地震,1995,11,(4):299-309.
[10] 胡辉,阚荣举,李晓明,等.丽江地震前云南天文台时纬残差异常[J].自然灾害学报,1997,6(1):19-24.
[11] IERSStandards(1989),IERSTECHNICALNOTE 3[S].
[12] VondrakJ .ProblemofsmoothingobservationaldataII[J].BulletinoftheAstronomicalInstitutesofCzechoslovakia,1977,28(2).
[13] 黄坤仪,周雄.Whithakcr-Voudrak法滤波本质的探讨和数值滤波的方差与相关性估计[J].天文学报,1981,22(2):120-128.
[14] 郑大伟,董大南.用多级滤波器实现极移序列的窄带滤波[J].天文学报,1986,27(4):368-376.
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