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重力数据是地下场源产生的重力场的叠加,包含了地下从浅部到深部的丰富信息.高阶卫星资料的丰富为青藏高原深部构造研究提供了重要资料.基于EIGEN-6C2模型作为原始数据,首先对青藏高原布格重力异常和均衡重力异常分别作1~5阶尺度分解,得到不同尺度重力异常的分布特性,探讨不同空间尺度反映的地壳构造意义.其次,基于径向对数功率谱估计平均深度方法理论,进一步研究1~5阶细节反映的场源深度.再次,利用Canny算子的多尺度边缘检测识别和分析重力异常中表现不明显的断裂,定位断裂在地表的位置,识别青藏高原内部断块边界,完成活动块体和次级块体的划分.最后,对布格重力异常进行沉积层及岩石圈改正,采用Parker-Oldenbarg三维位场反演法反演青藏高原莫霍界面起伏.
The gravity data is the superposition of the gravity field generated by the underground field sources and contains abundant information from the shallow depth to the deep underground.The abundance of high-order satellite data provides important data for the study of the deep structure of the Qinghai-Tibet Plateau.Based on the EIGEN-6C2 model as the raw data Firstly, the scale-1 to 5-scale decomposition of the Bouguer gravity anomalies and the equilibrium gravity anomalies in the Qinghai-Tibet Plateau are respectively carried out to obtain the distribution characteristics of gravity anomalies at different scales and to explore the significance of the crustal structure reflected by different spatial scales.Secondly, based on the radial logarithmic power spectrum The average depth method theory is used to further study the depth of field source reflected by the first to fifth order details.Furthermore, the multiscale edge detection of Canny operator is used to identify and analyze the faults with insignificant gravimetric anomalies, Finally, the sedimentary and lithospheric corrections to the Bouguer gravity anomaly were performed, and the inversion of Parker-Oldenbarg 3D field was used to inverse the Moho Interface ups and downs.