ASSESSMENT OF PART OF ITERIGBI FOR BUILDING SUITABILITY USING THE SEISMIC REFRACTION TOMOGRAPHY METHOD
Abstract
ABSTRACT
This study evaluates the suitability of a portion of Iterigbi, Delta State, Nigeria, for building construction using the seismic refraction tomography (SRT) method. The research employed a forward-reverse and split-spread configuration across four profiles, with data acquisition conducted using a PASI GEA24 seismograph and 24 geophones spaced at 1.6meter intervals. The results revealed three distinct subsurface layers: a loose, unconsolidated weathered layer (0–3 m depth) with low seismic velocities (75.5–137.8 m/s), a partially consolidated clayey sand layer with moderate velocities (137.4–279.9 m/s) and varying thicknesses (up to 8 m), and a dense, consolidated clay layer with high seismic velocities (294.9–439.7 m/s). The findings highlight the geotechnical heterogeneity of the subsurface, with the topmost layer deemed unsuitable for construction without stabilization. Recommendations include excavating the weathered layer to a depth of 3 meters, designing foundations on deeper, more competent layers, and implementing geotechnical reinforcements where necessary. This research underscores the importance of subsurface characterization in ensuring sustainable and safe construction practices.
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