• 责任者：Fu Guangyu (Key Laboratory of Earthquake Prediction ; Institute of Earthquake Science ; China Earthquake Administration ; Beijing 100036 ; China) ; Zhu Yiqing
• 刊名：Chinese Journal of Geophysics
• 出版年：2013
• 卷期：56(11)
• 关键词：重力场 ; gravity field ; 自由空气异常 ; free-air anomaly ; 地球物理模型 ; geophysical models ; 四川盆地 ; Sichuan Basin
• 页码：p.3761-3769
• 图表：6 illus., 2 tables, 19 refs.
• 分类号：0400
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

     Recently we built a dense regional observation network,which is made up of 302 stations,at the west of Sichuan Basin,and carried out a gravity/GPS hybrid observation campaign.The aim is to get the detailed features of the Free-air Gravity Anomaly （FGA） at the study area,and to evaluate the quality of the modeled results of EGM2008.As a whole the observed FGAs are negative.They change slowly from about-160× 10 5ms^-2 at west to-60×10 5ms^-2 at east of the study area.The modeled FGAs from EGM2008 consist well with the topography of the west of Sichuan Basin.There exist visible modeled gravity gradient belts at both Longquan Mountain and the boundary of Sichuan Basin and Tibetan Plateau.At the southeast of the study area the modeled FGAs are about-50 × 10^-5 ms^-2.However,at the Chengdu plain to the west of Longquan Mountain,the modeled FGAs become as large as-120× 10 5 ms^-2 or so.The discrepancies between the modeled FGAs and the observed ones change slightly round-10 × 10^-5ms^-2 at most points of our observation network,indicating that the EGM2008 can recover the total distribution shape of the earth gravitational field in the study area.If adjusted by a number of observation results in situ at the earth＇s surface,the EGM2008 will reflect well the real gravitational field of the earth.