联合多源卫星和地面重力数据研究中国及邻区莫霍面深度

For the status quo of the uncertainty on sensitive factors affecting the Moho depth, lower resolution and accuracy of Moho depth model in China and adjacent areas,and the shortage of separation methods of gravity data and inversion constraint methods, this project will use the GOCE with other satellites gravity and ground gravity data, and propose joint stripping method and wavelet multiscale method to separate gravity data, effectively joint isostaty theory and interface inversion method, to determine the integrity Moho depth of China and adjacent areas from the pure gravity angle. The research work includes: ①exploring effective comprehensive utilization of multisource satellites gravity data and ground data; ②mining variety of geophysical information in gravity data and studying the different sensitivity to the anomaly; ③inversing satellite and terrestrial gravity data to research Moho depth in China and surroundings. The project will build a joint application of the theory and algorithms for multisource satellites gravity and terrestrial gravity data, discovery terrain, crust and other information contained in the gravity data, and inverse Moho depth model in China and adjacent areas. The research will help in deepening the understanding of Moho in China and its adjacent areas, and improving global Moho high frequency information, which will have a far-reaching significance in exploring the regional tectonic framework, resources and energy potential prospects,earthquake disaster, and so on.

针对目前中国及邻区莫霍面深度模型分辨率和精度较低，影响莫霍面深度的敏感因素不确定，重力数据分离方法和反演约束方法存在不足等现状，本课题联合利用GOCE等多源卫星和地面重力数据，提出剥除法和小波多尺度方法联合分离重力数据，将均衡理论与界面反演有效联合，从纯重力学角度确定中国及邻区的莫霍面深度。研究内容包括：①构建多源卫星重力和地面重力数据有效综合应用的理论和算法；②挖掘多源重力数据的地球物理信息，研究其对异常量的不同敏感性；③联合均衡理论和界面反演方法确定中国及邻区莫霍面深度。本项目将通过多源卫星和地面重力数据的有效联合应用，挖掘重力数据中包含的地形、地壳等信息，反演获得中国及邻区完整的莫霍面深度模型，研究成果有助于加深对我国及邻区莫霍面的认识，提高全球莫霍面的高频信息，对探讨地区构造格局、资源与能源潜在前景、地震灾害等均将有着深远的意义。

本课题利用多种卫星重力场模型（EIGEN系列）、EGM2008重力场模型、CRUST1.0模型、大气模型和地形数据等，联合均衡理论和界面反演方法，从重力学角度反演了中国及邻区莫霍面深度。课题收集了近年来国内外中国大陆及周边莫霍面深度研究情况，研究了多源卫星重力数据有效融合的理论方法。采用小波多尺度方法对重力异常进行了分离解释，并基于小波多尺度边缘方法获得了数值剖面的莫霍面深度值。项目分别对地形影响、大气负荷影响、陆地水负荷影响等进行了详细的计算和分析，最后反演获得了中国及邻区的莫霍面深度图，与国内外相关研究结果进行了对比分析。项目研究成果有助于研究多种重力数据的综合应用，加深对我国及邻区莫霍面的认识。