Characteristics of Ground Particle Vibrations from Underground Blasting in Seismic Exploration in the Niger Delta, Nigeria
Abstract
A total of 139 buried detonation events, in the seismic exploration operation, are recorded with Digital
Seismograph # NSC 5210M/D-0216, with the aim of determining ground vibration properties in the area of study.
The energy source is a constant explosive charge of 0.5kg per hole in a pattern blast of 5 holes in linear array per
blast, for a total of 2.5kg charge of explosive per blast. The results from the work show a mean peak ground particle
velocity (V) with offset distance (r) from the blast for the longitudinal, transverse and vertical directions are V = L
-1.28 -1 -1.05 -1.15 825.75r , V = 531.11r .70 and V = 172.5r respectively, with a regional resultant mean of V = 561.97r T V
-1 mms . Maximum amplitude of ground vibration occurs in the frequency range of 5-12 Hz, implying that any
structures with the natural frequencies in the range 5-12 Hz are likely to be excited into vigorous vibrations and
subsequent damage by an explosive blast within the Niger Delta area. Site constants C = K = 2.75, n = -1.15. The
-1 -1 weathered layer velocity ranges between 213 ms and 781 ms with weathered thickness ranging between 2.70m
-1 -1 and 16.50m; the underlying consolidated velocity ranges between 1651 ms and 1906ms . The results of this work
can be applied for environmental, quarrying, geothermal and seismic exploration work in the area of study.
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