Abstract
Journal of the Geological Society of Sri Lanka is a peer-reviewed and open access journal published by the Geological Society of Sri Lanka. It aims to publish the most topical and highest quality papers, summarizing the results of recent research across all sub-disciplines of the Earth Science. Papers are frequently interdisciplinary covering both pure and applied fields of Geology. Contributions often refer to local, regional and/or international studies and emphasize the development of the understanding of fundamental geological processes.
Highlights
Sri Lanka being a country in the tropics is exposed to heavy rainfalls regularly throughout the year
After analyzing the nature of the site, a 1-D vertical electrical sounding (VES) survey was carried out using the ABEM SAS 300 Terrameter following the Schlumberger array (Figure 1) in order to assess the response of the resistivity instrument and to clarify the nature of the soil profile and the bed rock formation of the site
The relatively lower apparent resistivity values recorded at VES 01 (Figure 7) might be due to the presence of moisture in the overburden while the anomaly at a depth of 30 m - 40 m could be a quartzite boulder resting in the clay layer
Summary
Sri Lanka being a country in the tropics is exposed to heavy rainfalls regularly throughout the year. The mountainous terrain of the country together with the intense rainfall pattern triggers landslides every year. Landslides are likely to generate changes in parameters of the ground such as groundwater flow and water pressure due to accumulation of groundwater. These changes can be used to map the landslide body in terms of groundwater flow and accumulation (Jongmans and Garambois, 2007). Geophysical methods seem to be an approach for such an exercise as they can be used to map the subsurface nature of a landslide and provide data over a volume rather than on a point or in one dimension (Everett, 2013; Kearey et al, 2001). The deeper-the penetration, the poorer-the resolution becomes, a characteristic trade-off expected in geophysical surveys
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