Estimation of frequency dependent coda wave attenuation structure at the vicinity of Cairo Metropolitan Area |
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| Authors: | Salah El-Hadidy M E Mohamed Adel Ahmed Deif Ahmed Sayed Abu El-Ata S R Moustafa Sayed |
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| Institution: | (1) The National Research Institute of Astronomy and Geophysics (NRIAG), Cairo, Egypt;(2) Faculty of Science, Geophysics Department, Ain Shams University, Cairo, Egypt |
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| Abstract: | Estimation of seismic wave attenuation in the shallow crust in terms of coda wave Q structure previously investigated in the vicinity of Cairo Metropolitan Area was improved using seismograms of local earthquakes
recorded by the Egyptian National Seismic Network. The seismic wave attenuation was measured from the time decay of coda wave
amplitudes on narrow bandpass filtered seismograms based on the single scattering theory. The frequency bands of interest
are from 1.5 to 18 Hz. In general, the values obtained for various events recorded at El-Fayoum and Wadi Hagul stations are
very similar for all frequency bands. A regional attenuation law Q
c
= 85.66 f
0.79 was obtained. |
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| Keywords: | seismic wave attenuation coda wave frequency dependent attenuation Cairo seismic wave |
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