【作者】 叶正仁； 谢小碧；

【Author】 Ye Zhengren Xie Xiaobi (Institute of Geophysics,Chinese Academy of Sciences)

【机构】 中国科学院地球物理研究所；

【摘要】 攀枝花-西昌地区地处南北地震带,而且其中可能包含一个大陆裂谷带.因此研究该区的地壳均衡及密度分布具有重要意义.本文运用均衡响应函数的方法,由该区的布格重力异常和地形资料得出均衡响应函数,并依此反演了地壳和上地幔中补偿密度的分布.结果表明,该地区的地壳基本上已达到均衡,且用局部均衡模式较之区域均衡模式能更好地逼近实际资料.所得均衡深度约为40km,补偿密度主要分布在地壳中10-30km深度处,40km之下补偿密度基本为零.更多还原

【Abstract】 Using the isostatic response function technique,we have investigated the isostasy and crustal density structure of Panzhihua-Xichang region,which was supposed to contain a continental rift valley.The topographic and Bouguer gravity anomaly data in an area of 630km×630km were collected and the isostatic response function was calculated by means of two-dimensional FFT.Then the crustal density structure was inverted.The result shows that the crust in this region is isostatic on the whole and local isostatic model fits the observational data better than regional model.The depth of compensation is about 40km with compensated density distribution mainly in the depth range of 10--30km.更多还原