E003 Seismic Reflection Investigation of Gypsum Dissolution and Subsidence at Hell Kettles Darlington C. Sargent* (Durham University) & N.R. Goulty (Durham University) SUMMARY The overall objective of our research is to demonstrate the viability of the seismic reflection method for detecting evidence of gypsum dissolution in the subsurface and to educate the geotechnical community in its use for assessing subsidence hazard in site investigation. Gypsum beds of the Permian Zechstein sequence sub-crop beneath thick unconsolidated Quaternary deposits in the Darlington area. Subsidence features attributed to gypsum dissolution are typically broad shallow depressions up to 100m in diameter and the ponds


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