USE OF HORIZONTAL GRADIENT AND ANALYTICAL SIGNAL OF GRAVITY DATA FOR IDENTIFYING THE SUBSURFACE STRUCTURAL SETTING IN WADI EL-ASSUITY AREA, EGYPT | ||
| Journal of Egyptian Geophysical Society | ||
| Volume 8, Issue 1, 2010, Pages 95-102 PDF (5.82 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jegs.2010.380906 | ||
| Author | ||
| A.S. Helaly | ||
| Department of Geophysics, Faculty of Science, Ain Shams University. Abbassia, Cairo, Egypt, 11566 | ||
| Abstract | ||
| Wadi El-Assuity is located in the central part of the Eastern Desert, Egypt. In this study, the author attempted to delineate the relatively deep subsurface structures of the area through the interpretation of the available Bouguer gravity data. The horizontal gradient and analytical signal techniques were applied in the present study. Interpretation of horizontal gradient of the gravity data indicated that, the area is characterized by the existence of high gradient anomalies reflecting the presence of linear structural elements in the form of faults that are mainly striking in the NE-SW direction inside Wadi El-Assuity and NW-SE direction in the Nile Valley. The NE oriented fault bounding the southeastern side of El-Assuity coalesces with a zigzag fault system that extends to the Western Desert. The NE elongated graben in Wadi El-Assuity changes its trend to have NW-SE direction inside the Nile Valley. The direction of a geologic strike is easier to deal with through the interpretation of analytical signal amplitude than of the original field data. It is also straight forward to determine the depths to causative sources from the distance between minima points of analytical signal anomalies. Therefore, the analytical signal was used to estimate the depths to such deep contacts, which range from 4.8 to 5.8 km. The wide gravity gradient in the study area was inspected into a number of expected fault elements of different throw directions, based on the analysis of the analytical signal method. Based on the estimated depths and slightly varying density contrasts, a conceptual model along one profile was introduced to represent the expected general deep structural set-up in the area under study. | ||
| Keywords | ||
| Horizontal gradient; analytical signal; gravity interpretation; Wadi El-Assuity area | ||
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