Browsing by Author "Hurrisa, Mekonnen"

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    Seismic Waveform Analysis from the Quarry Blast Records Around Addis Ababa
    (Addis Ababa,University, 2003-06) Hurrisa, Mekonnen; Mammo, Tilahun (PhD)
    The seismic wave generated at the quarry blasts in the area of investigation are detected and recorded by the Furi broadband seismic station. The seismic records provide the wave patterns of signi ficant amplitudes and frequency contents that can be used for the study of di fferent seismic and elastic parameters that characterize the types ofrock fonnat ions. This study is carried out to determ ine the relation ships among the amplitudes, frequencies, charge size, epi-central di stance, depths of explosion and finally compute the body wave velocities (V, and Vs), velocity ratio (VpNs) and the Poisson's ratio (v ) from the path X, traversed by the seismic waves and the delay times 61 found from the observed arrival times and origin times. Both the computed velocity ratio (V"Ns = 1.76) and the Poisson's ratio (v = 0.26) for the rock formation in the area approach the condition of Poi sson's re lation (v = • 0.25, VPNS =1.732 and KJ~ = 1.67). These results possibly describe the similar ity of fractures in the whole rock formations in the area.