华北地区大地水准面起伏及其构造意义  

GEOID UNDULATION IN NORTH CHINA AND ITS TECTONIC INTERPRETATION

作　　者：徐菊生[1] 赖锡安[1] 卓力格图 晁定波[2] 李建成[2] 李延兴[3] 胡新康[3] 刘烈昭[4] 

机构地区：[1]国家地震局地震研究所 [2]武汉测绘科技大学 [3]国家地震局第一地形变监测中心 [4]中科院测量与地球物理研究所

出　　处：《地壳形变与地震》1998年第2期9-19,共11页Crustal Deformation and Earthquake

基　　金：国家自然科学基金49674209和华北GPS网建设课题共同资助

摘　　要：利用ＧＰＳ水准对几个重力场模型计算的大地水准面进行了检验。利用ＷＤＭ９４模型编制了华北地区不同阶次的大地水准面起伏图，讨论了大地水准面起伏和该地区构造横向不均匀性的关系。结果显示：华北地区大地水准面由东向西逐渐降低，总体形态和本区地壳厚度呈镜像关系，且具有明显的分区特征；大地水准面的梯度带和本区３种不同地形的分界带（华北平原，太行山区，鄂尔多斯块体）一致，其中１１５°（Ｅ）分界带和我国东部的主要地壳厚度梯度带一致；大地水准面零等值线的两侧是地震比较集中的地带。In this paper, the geoid calculated by several gravity field models is tested by using GPS leveling. The geoid undulation diagrams in different degrees are mapped by WDM94 model. The relationship between the geoid undulation and the lateral inhomogeneity of regional tectonics is discussed. The conclusions are:the geoid height in North China area decreases gradually from the east to the west; the relationship between the general shape and the crustal thickness of this area is a “mirror image' with obvious regional features in different parts. Three parts of the North China region can be separated by gradient belts of geoid undulation. They are North China plain; Taihang mountain and Ordos massif. The boundary zone of 115°(E) is consistent with that of a great steep gradient of crustal thickness in the east part of China. Both sides of the zero isoline are belts where earthquakes are more concentrative.

关 键 词：大地水准面 GPS水准 地球深部构造 华北地区 

分 类 号：P224[天文地球—大地测量学与测量工程] P548.2[天文地球—测绘科学与技术]