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Interpretation of gravity anomalies via terracing method of the profile curvature | ||
| فیزیک زمین و فضا | ||
| مقاله 10، دوره 41، شماره 4، دی 1394، صفحه 105-113 اصل مقاله (1011.87 K) | ||
| شناسه دیجیتال (DOI): 10.22059/jesphys.2015.57227 | ||
| نویسندگان | ||
| Mahnaz Eskandari1؛ Vahid Ebrahimzadeh Ardestani* 2 | ||
| 1M.Sc. Graduated, Department of Geophysics, Islamic Azad University of Hamedan, Iran | ||
| 2Professor, Department of Earth Physics, Institute of Geophysics, University of Tehran, Iran | ||
| چکیده | ||
| One of the main goals of interpretation of gravity data is to detect location and edges of the anomalies. Edge detection of gravity anomalies is carried out by different methods. Terracing of the data is one of the approaches that help the interpreter to achieve appropriate results of edge detection. This goal becomes a complex task when the gravity anomalies have smooth borders due to gradual change of density contrast. In this article terracing of data has been inspected using the profile curvature method. The synthetic data are used to assess the accuracy and efficiency of the method in edge detection of gravity anomalies. The results of this research have been compared with the results of other methods such as first vertical derivation, analytic signal, tilt angle, horizontal gradient of tilt angle, and laplacian second derivative. Two real data set are also used to show the applicability of the method. | ||
| کلیدواژه‌ها | ||
| Analytic signal؛ Laplacian operator؛ Local phase angle؛ Profile curvature | ||
| عنوان مقاله [English] | ||
| Interpretation of gravity anomalies via terracing method of the profile curvature | ||
| نویسندگان [English] | ||
| Mahnaz Eskandari1؛ Vahid Ebrahimzadeh Ardestani2 | ||
| 1M.Sc. Graduated, Department of Geophysics, Islamic Azad University of Hamedan, Iran | ||
| 2Professor, Department of Earth Physics, Institute of Geophysics, University of Tehran, Iran | ||
| چکیده [English] | ||
| One of the main goals of interpretation of gravity data is to detect location and edges of the anomalies. Edge detection of gravity anomalies is carried out by different methods. Terracing of the data is one of the approaches that help the interpreter to achieve appropriate results of edge detection. This goal becomes a complex task when the gravity anomalies have smooth borders due to gradual change of density contrast. In this article terracing of data has been inspected using the profile curvature method. The synthetic data are used to assess the accuracy and efficiency of the method in edge detection of gravity anomalies. The results of this research have been compared with the results of other methods such as first vertical derivation, analytic signal, tilt angle, horizontal gradient of tilt angle, and laplacian second derivative. Two real data set are also used to show the applicability of the method. | ||
| کلیدواژه‌ها [English] | ||
| Analytic signal, Laplacian operator, Local phase angle, Profile curvature | ||
| مراجع | ||
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Blakely, R. J., 1995, Potential theory in gravity and magnetic applications, Cambridge University Press, New York 326 pp. Cooper, G. R. J. and Cowan, D. R. 2009, Terracing potential field data, Geophysical prospecting, 57, 1067-1071. Cooper, G. R. J. and Cowan, D. R., 2006, Enhancing potential field data using filters based on the local phase: Comp. & Geoscience 32, 1585-1591. Cooper, G. R. J. and Cowan, D. R., 2004, Filtering using variable order vertical derivatives, Computers & Geosciences, 30, 455-459. Cordell, L. and McCafferty, A. E., 1989, A terracing operator for physical property mapping with Potential field data, Geophysics, 54, 621-634. Kepr, B., 1969, Differential geometry. In: Rektorys, K. (Ed.), Survey of Applicable Mathematics, M.I.T. Press, Cambridge, 298-372. Klingele, E. E., Marson, I. and Khahle, H. G., 1991, Automatic interpretation of gravity gradiometric data in two dimensions: vertical gradient, Geophysical Prospecting, 39, 407-434. Miller, H. G. and Singh, V., 1994, Potential field tilt-a new concept for location of potential field sources, J. Appl. Geophysics, 32, 213-217. Mitasova, H. and Jarosalav, H., 1993, Interpolation by regularized spline with tension: II. Application to terrain modeling and surface geometry analysis, Mathematical Geology, 25, 657-669. Nabighian, M. N., 1972, The analytical signal of 2D magnetic bodies with polygonal cross-section: Its properties and use for automated anomaly interpretation,Geophysics,37, 507-517. Pilkington, M. and Keating, P., 2004, Contact mapping from gridded magnetic data- a comparison: Extended abstracts, ASEG17th Geophysical Conference and Exhibition. Thomas, Jr., G. B., 1968, Calculus and analytic geometry: part two vectors and functions of several variables, Addison-Wesley Publishing, Reading, MA, USA. 784 pp. Veruzco, B., Fairhead, J.D. and Green, C. M., 2004, New insights into magnetic derivatives for structural mapping: The Keading Edge, 23(2), 116-119. | ||
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