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  

Interannual variations of the vertical at Yunnan by astrometry and gravimetry techniques

作　　者：胡辉[1] 李正心[2] 李辉[3] 傅广裕[3] 

机构地区：[1]中国科学院国家天文台云南天文台,云南昆明650011 [2]中国科学院上海天文台,上海200030 [3]中国地震局地震研究所,湖北武汉430071

出　　处：《自然灾害学报》2003年第2期25-27,共3页Journal of Natural Disasters

基　　金：国家自然科学基金资助项目 ( 19973 0 11)

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 。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.

关 键 词：云南 年际变化 天体测量 重力测定资料 重力网 大地水准面 垂线偏差 

分 类 号：P223[天文地球—大地测量学与测量工程]