Analysis of Regional Anomaly on Magnetic Data Using the Upward Continuation Method

Abstract

Separation of regional anomalies and residual anomalies are important steps in processing magnetic data. The better separation of the two anomalies resulting data which can be easily interpreting. The most commonly used in the separation of regional-residual anomalies is the upward continuation method. In this study, we used synthetic models I (consists of four blocks with different depths) and II (consists of four blocks with different susceptibility) to determine the height of uplift in the upward continuation method. The results obtained by the appointment that illustrate the regional anomaly in the model I are 50 to 90 meters, while model II at the lift height of 20 to 60 meters. The model I shows the lifting results of 50 to 90 meters almost close to the regional anomaly response which has a range of anomalous value of -0.703-2.408 nT. Among 50-90 meters, the lifting height of 90 m is closest to the contour and range of regional component anomalies. Model II shows the lift results that are close to the regional anomaly response at 20 to 60 meters. Model II shows the lift results that approach regional anomalies (-7,780-18,012 nT) at 20 to 60 meters, which most closely approximates the regional component anomaly range is the lifting of 40 meters with -6,152-16,629 nT. The correlation between these two models is very useful for analyzing the earth’s magnetic field signal.