三江地区重力场特征和岩石圈构造

基金项目: 国家自然科学基金资助项目(49874005;40174007)

详细信息

Gravity Field Character and Lithosphere Tectonics in Sanjiang Region

Institute of Geodesy and Geophysics, Chinese Academy of Sciences, 154 Xudong Road, Wuhan, China, 430077

摘要: 利用重力、地震层析成像等多种资料,并利用场分离、正反演以及阻尼最小二乘法、约束最小二乘法等数学方法,对重力异常进行分离,用地震层析成像的结果作为约束进行反演,得到地壳上地幔不同深度的密度分布和莫霍面深度等结果。
- 场分离 /
- 重力异常 /
- 密度分布
Abstract: The authors inverted density anomalies on the different layer in the depth range of 10~100 km in Sanjiang Region,using gravity field that is treated by separation and adjustment.The results of combining other geophysical data to analyse the density data show that:1) The material in Sanjiang Region possibly comes from the extension of the Qinghai-Tibet Plateau;2) Low velocity layer exits in the crust of Sanjian Region;3) The earthquake easily occurred at the inflection points of density and gravity anomalies in lithosphere,especially at the complex inflection.
- field seperation /
- gravity anomaly /
- density distribution