The combination of vertical derivatives and upward continuation of gravity field is efficient to display the features of shallow structure.
将重力场的垂直导数和向上延拓结合起来，有利于揭示地壳上部构造特征。
Qingdong sag is a secondary structure unit of Jiyang depression and lies in Bohai shallow sea waters.
青东凹陷是济阳坳陷的一个次级构造单元，位于渤海浅水海域。
It is simpler than the surface structure and its position is to the north, reflecting that shallow layers have undergone the movement from north to south.
它与地表构造比较要简单一些，且位置偏北，反映浅层经历了由北而南的移动。
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