Optimum height estimation in upward continuation of potential field data; A case study: magnetic data at Kalshaneh area in Tabas region

In this paper, we investigated optimum height in upward continuation of potential field data to separate local anomalies from regional ones. Cross correlation of the data at different heights was used to achieve this goal. In order to obtain optimum height of upward continuation, two methods were introduced. In the first one, cross correlation of the known regional anomalies and upward continuation of the total magnetic field at different heights was used. In this method, the height at which maximum of correlation coefficient happens is the optimum height of upward continuation. The second method is based on cross correlation of upward continued of two consecutive heights of total magnetic field. The height at which the maximum deviation of the first point and the second point from the curve of cross correlation versus height occurs is the optimum of height. The second method is preferable as we always have total magnetic field data at different heights. We applied the second method on the magnetic data from Kalshaneh area in Tabas region. In this area, the optimum height for upward continuation is 60 m in which we can separate local anomalies from deep ones.