Seismic Waveform Analysis from the Quarry Blast Records Around Addis Ababa
No Thumbnail Available
Date
2003-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa,University
Abstract
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.
Description
Keywords
Seismic Waveform Analysis From The Quarry Blast