全球地壳模型CRUST1.0在青藏高原东南部的重力检核

Gravity Checking on the CRUST1.0 Model in the Southeastern Tibetan Plateau

利用全球地壳模型CRUST1.0提供的地壳密度、厚度等分层信息,计算青藏高原东南部地壳各分层引起的重力异常,并累加获取总体布格重力异常,最后与利用全球重力场模型EGM2008获得的布格重力异常进行对比。结果表明,两种模型在大部分区域基本一致,布格重力异常变化在-600～20mGal之间,少数地区存在较大的差距,说明CRUST1.0模型的精度还有待提高。

This paper proposes a calculation method of the Bouguer gravity anomaly with stratification information of the CRUST1.0 model in the region of southeastern Tibetan plateau and compares it with the EGM2008 model. The results shows that in most places there is a little difference between the two, and that the Bouguer gravity anomaly ranged from --600 mGal to 20 mGal. The study illus- trates that the precision of the model still needs to be improved.