Crustal structure of Tushka Region, Abu-Simbel, Egypt, inferred from spectral ratios of P waves of local earthquakes |
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| Authors: | Ali A Gharib |
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| Institution: | (1) National Research Institute of Astronomy and Geophysics (NRIAG), 11421-Helwan, Cairo, Egypt |
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| Abstract: | The crustal structure of North Abu-Simbel area was studied using spectral ratios of short-period P waves. Three-component short period seismograms from the Masmas seismic station of the Egyptian National Seismic Network
Stations were used. The Thomson-Haskell matrix formulation was applied for linearly elastic, homogeneous crustal layers. The
obtained model suggests that the crust under the study region consists of a thin (0.8 km) superficial top layer with a P-wave velocity of 3.8±0.7 km/s and three distinct layers with a mean P-wave velocity of 6.6 km/s, overlaying the upper mantle
with a P-wave velocity of 8.3 km/s (fixed).
The results were obtained for 14 different earthquakes. The P-wave velocities of the three layers are: 5.8±0.6 km/s, 6.5±0.4 km/s and 7.2±0.3 km/s. The total depth to the Moho interface
is 32±2 km. The crustal velocity model estimated using observations is relatively simple, being characterized by smooth velocity
variations through the middle and lower crust and normal crustal thickness. The resultant crustal model is consistent with
the model obtained from previous deep seismic soundings along the northern part of Aswan lake zone. |
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| Keywords: | Tushka region P-wave spectral ratios cross-correlation crustal structure model |
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