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一、基岩起伏对重力观测的影响与沉积变质有关的铁矿，大都分布在老的变质岩系基底的上表面附近，在其上部一般又都沉积有厚度不等的第三、四系疏松岩层。由于基岩产生的重力异常常常显著超过铁矿的重力异常，使矿异常成为附加在大的基岩起伏重力场上的微弱变化；基岩表面地形起伏变化，也会形成与矿异常相似的假异常，使平原地区的重力解释工作出现困难。现以河南省许昌某矿区的情况为例，对基岩起伏的影响进行分析：
First, the fluctuation of bedrock on the impact of gravity observations Sedimentary metamorphic iron deposits, mostly distributed in the old metamorphic rock near the upper surface of the substrate, in general, are also deposited in the upper part of the thickness of the third and fourth loose Rock formation. Since the gravitational anomalies produced by the bedrock often significantly exceed the gravity anomalies of the iron ore, the mine anomaly becomes a faint change that is added to the large bedrock gravity field. The undulating topography of the bedrock also forms a false Abnormal, so that the plain area of gravity explained difficulties. Now taking the case of a mining area in Xuchang, Henan Province as an example, the influence of bedrock fluctuation is analyzed: