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重力异常四次导数和重力异常二次导数一样,具有突出局部异常,压制区域异常的作用。利用重力场的泰勒级数展开式,可求出重力异常的四次导数。利用华北 G 凹陷1:5万重力细测资料,计算了重力异常四次导数,和地震勘探的下第三系构造图以及前第三系构造图相对比,其构造符合率达75％,并发现一批可能的潜伏构造。这对于地质构造很复杂的地区来说,是有意义的。本文是对重力异常高次导数应用的一次尝试,尚有一些问题需作进一步研究。
The fourth derivative of gravity anomaly, like the second derivative of gravity anomaly, has the function of highlighting the local anomaly and suppressing the abnormality of the region. Using the Taylor series expansion of the gravity field, the fourth derivative of the gravity anomaly can be found. Using the gravimetric detailed data of 1: 50000 in the G depression of North China, the fourth derivative of gravity anomaly was calculated and compared with the lower Tertiary tectonic map and the Tertiary tectonic map of the seismic exploration, the structural coincidence rate reached 75% Find a group of potential lurking structures. This makes sense for areas with complex geological formations. This paper is an attempt to apply the high-order derivative of gravity anomalies. There are still some problems to be studied further.