MAGNETOSEISMIC STUDIES IN THE EAST QATTARA DEPRESSION, NORTHWESTERN DESERT, EGYPT
T. Rabeha,b
aNational Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt
bFaculty of Sciences, IDL, University of Lisbon, Lisbon, Portugal
Keywords: Magnetic survey, seismic profiles, Egypt.
Pages: 916-925
Abstract
The potential field data are considered the main supporting factor in the geophysical exploration process for detecting and evaluating the subsurface structures. In this respect a detailed land magnetic survey was performed in the area that was subjected before to seismic investigations. The main target of this study is to detect the deeper subsurface structures and to investigate possible relations of these structures with earthquake activity.
The RTP aeromagnetic map was used for detecting the regional extension of the interpreted structures from the land magnetic survey. The interpretations were performed by RTP land and aeromagnetic maps using filtering technique, least-squares separations, tectonic trend analysis, spectral analysis, Werner method, and Euler and two-dimensional techniques. The results show that the main dominant tectonic trends are 35?N- 45?W, 45?N-65?E, E-W, and Aqaba trends.
Moreover, two seismic lines WQ85-31B and 127 were interpreted, and the location of these lines was matched with the deduced tectonic map. The results show that there is a great matching between the location of the faults deduced from both the geomagnetic and seismic data. The obtained results show a complete agreement with the well logging data.
Furthermore, these structures are correlated with the recorded earthquake activities by National Egyptian Seismological Network (ENSN). The correlation implies that the studied area is more stable than other adjacent areas in the northern parts of Egypt close to the Mediterranean Sea and Nile River delta.
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