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As part of the ongoing program for monitoring and assessing the stability of slopes surrounding the Eildon Hill Reservoir in Brisbane, a series of Seismic Refraction Tomography (SRT) surveys were conducted to characterise subsurface conditions and evaluate ground structure integrity.

The scope of work involved the acquisition of seismic data along multiple profiles, employing rope access techniques to safely access steep and restricted areas. The SRT method was used to delineate subsurface layering and identify key geotechnical boundaries critical for slope stability analysis.

The investigation produced 2D tomographic models illustrating variations in P-wave velocity with depth, providing valuable insights into the distribution of soil, weathered, and rock materials. The interpreted models clearly defined the transition from overlying soils to highly weathered and competent rock.

Importantly, the SRT results showed excellent correlation with available borehole data, reinforcing the reliability of the seismic interpretations. Together, these datasets offer a robust foundation for understanding the geological and geotechnical framework of the site, supporting ongoing monitoring and future engineering assessments at the reservoir.