Journal of Geology & Geophysics
Open Access
ISSN: 2381-8719
ISSN: 2381-8719
Agbodike Ifeanyi Ikechukwu Chukwuemeka
Imo State University, Nigeria
Posters & Accepted Abstracts: J Geol Geophys
Tomography is an imaging technique that makes use of an energy source to probe the subsurface and produce a tomogram which represents a model of the geologic structure that exists below the subsurface. The principles of tomography initially were applied in the medical field and in recent times applied in global and exploration geophysics. The Oru area has no baseline information on the velocity and thickness of the weathered zone in this area. A survey was therefore carried out to obtain these parameters. Measurements were made along a total of 10 profiles evenly distributed within the area. The receivers were placed at 10 m interval; an offset distance of 30 m on both sides of the profile was used. A 10 kg sledge hammer was used to produce the seismic signals while Mark 6 digital 12-channel seismograph was used to record the seismic signals and traces. The Reflexw software was used to process the raw data, while GPS was used to obtain the co-ordinates of the profiles. This research work has established that the distribution of p-wave velocity within the subsurface of this area shows a general increase of velocity with depth and the velocity varying from 400 m/s to 770 m/s. The thickness of this weathered layer was on the average 20.4 m. From these results, the lithology of the area was projected and regions with underground water were delineated. Another parameter calculated from these results was the geological age in years of the weathered layer which is in the order of 105 years.
Email: ifygift_2009@yahoo.com