In this work, a reconnaissance study is presented to delineate the subsurface structures and tectonics of the
Eastern Qattara Depression area using the available geophysical data; that include Bouguer gravity and aeromagnetic data.
To achieve this goal, several transformation techniques and filtering processes were accomplished on the Bouguer gravity
anomaly map and the total intensity aeromagnetic map, through both qualitative and quantitative analyses. At first, the
total intensity aeromagnetic map was processed through the application of reduction to the magnetic pole technique. In
addition, the fast Fourier transform was carried out on the gravity and RTP magnetic data for establishing the energy
spectrum curve and defining the residual (shallow) and regional (deep) sources. By the way, the frequency band pass
filtering was used to enhance the anomaly wave lengths associated with the shallow and deep sources. For optional
separation of the signals, the band pass filter was designed for each survey using the matched filtering. The equivalent
depths of the isolated short wavelength anomalies are 0.759 & 0.340 km below the flight surface, and the depths of the
intermediate wavelength anomalies are 1.28 & 2.00 km, as well as the depths of the long wavelength anomalies are 6.3 &
6.5 km for the gravity and magnetic data, respectively. Finally, the qualitative and quantitative interpretations of the
available Bouguer gravity and R.T.P. magnetic maps of the Eastern Qattara area, northern Western Desert, reflect the
occurrence of the various types of structures (folds and faults) and their components (anticlines and synclines, as well as
their dip-slip and strike-slip faults). Added, the main tectonic deformations of the study area have NNW-SSE, NNE-SSW,
NE-SW, NW-SE and E-W trends. |
