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

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Davodi Milad; Oveisy Moakhar Mohsen

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Journal: JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS Year:2020 | Volume:6 | Issue:1 Page(s): 51-59

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Title

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

Author(s)

Davodi Milad | Oveisy Moakhar Mohsen | Issue Writer Certificate

Keywords

Optimum height

Upward continuation

Cross correlation

Magnetic data

Tabas

Optimum height

Upward continuation

Abstract

Summary 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. Introduction For processing and interpretation of potential field data, it is necessary to remove shallow anomalies from deep ones. For doing this, different methods were used. One of the methods for separating local and regional anomalies is Upward continuation, which decreases the effect of local anomalies. In terms of wavelength, Upward continuation separates and supresses short wavelengths while the long wavelengths remain in the data. The Optimum height of Upward continuation of data is important as if it is not proper, a part of local anomalies effects are still in the rest of data that causes false interpretation. In this paper, we used Cross correlation of Magnetic data at different levels to find Optimum height for Upward continuation. The method applied on the real data from Tabas Region. The Optimum height in Upward continuation for this region is 60 m that enables us to remove the local anomalies. Theoretical basis Cross correlation between regional anomalies and upward continued of total field at a specified level is defined as follows: 0 0 2 2 0 0 0 0 (, ) (, ) (, ) (, ) r u M M r i j u i j i J g g M M M M r i j u i j i J i J g X Y g X Y r g X Y g X Y                    In this relation, M and N are, respectively, numbers of data in x and y directions. If Cross correlation of two functions, total field and regional field, are plotted versus height of Upward continuation, the height at which Cross correlation peaks, is the Optimum height of Upward continuation. As in real data, we do not know about regional anomalies, thus, Cross correlation of potential data at consecutive heights is used for Optimum height determination. For the latter method, the height at which maximum deviation of the line between first and end points from the curve of Cross correlation versus height is the Optimum height of Upward continuation. We applied the methods on artificial and real data. For the artificial data, we used gravity data while for the real data, Magnetic data were applied. The considered artificial models comprised of local anomalies at the depth of 400 m for and regional ones at the depth of 1500 m. The Optimum height of Upward continuation for the models was 500 m using both methods. As a result of applying the second method on the real data from Tabas region, the optimum depth of 60 m was obtained in which shallow anomalies were suppressed well. Conclusion To obtain the Optimum height of Upward continuation, we used Cross correlation of potential field data. In this manner, we used two different methods for Cross correlation of potential field data. In the first method, Cross correlation of regional field and total field at various heights were used while in the second one we used Cross correlation of upward continued field at consecutive heights. The Optimum height in both methods was the same. We applied the second method on the real Magnetic data from Tabas region in which the Optimum height of Upward continuation was obtained 60 m in which seemed to suppress the local anomalies greatly.

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APA: Copy

Davodi, Milad, & Oveisy Moakhar, Mohsen. (2020). Optimum height estimation in upward continuation of potential field data; A case study: magnetic data at Kalshaneh area in Tabas region. JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS, 6(1 ), 51-59. SID. https://sid.ir/paper/268594/en

Vancouver: Copy

Davodi Milad, Oveisy Moakhar Mohsen. Optimum height estimation in upward continuation of potential field data; A case study: magnetic data at Kalshaneh area in Tabas region. JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS[Internet]. 2020;6(1 ):51-59. Available from: https://sid.ir/paper/268594/en

IEEE: Copy

Milad Davodi, and Mohsen Oveisy Moakhar, “Optimum height estimation in upward continuation of potential field data; A case study: magnetic data at Kalshaneh area in Tabas region,” JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS, vol. 6, no. 1 , pp. 51–59, 2020, [Online]. Available: https://sid.ir/paper/268594/en

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