基于三维解析信号的中高纬度复杂磁异常研究--以旺尕秀磁异常为例

Study on Complex Magnetic Anomalies of the Middle and High Latitudes Based on Three-Dimensional Analytic Signals——A Case Study of Wang Ga Xiu Magnetic Anomaly

本文采用三维解析信号法研究了青海省旺尕秀地区地磁异常特征。通过对化极磁异常、低通滤波异常等的分析,结合研究区地表地质圈定出了局部磁异常,分析了局部磁异常的成因;采用化极磁异常三维解析信号振幅值和其半宽估算磁源体的埋深。对区内圈定的四处磁源体做了定性定量分析,为本区基础地质研究提供了有力依据。

This paper uses three-dimensional analytic signal method to study geomagnetic anomaly characteristics in the Wang gaxiu area,Qinghai province.Firstly,geomagnetic anomaly to magnetic pole,low-pass filter,to delineate local magnetic anomaly,and finally use the amplitude value of the three-dimensional analytic signal of magnetic anomaly and its half width to estimate the buried depth of the magnetic source.The qualitative and quantitative analysis of the circular magnetic source has provided a strong basis for the basic geological research in this area.And it is found that in the middle and high latitudes,the three-dimensional body anomaly is weakened or disappeared by the 3d analytic signal processing,which indicates that this method is more sensitive to the linear structure,and weaker for the circular structure.