Abstract
The application of using geophysical methods to mapping large aquifers has been under expanding interest during the past few years in Finland. Applying conventional geophysical methods to unconventional targets has given good results in terms of totally new information and even changed some old presumptions. The methodology used in several glaciofluvial formations in southwestern Finland has begun with the interpretation of bedrock structure by locating the fractured zones from low-altitude airborne geophysical and digital elevation data. After that some gravity profile measurements are made across these fractures to estimate the thickness of overburden. Refraction seismic soundings and ground penetrating radar are occasionally used to ensure the bedrock topography and to help estimating in-situ densities. Combining all the available material (geophysical data, information of groundwater levels) a three-dimensional estimation of the area is obtained. This is used to conceive decisions of the groundwater storage and flow capacity of the area surveyed. That has been one part in elaborating regional plan for eskers. Most cases have been made in co-operation with the Southwest Finland Regional Environment Centre, the Regional council of Southwest Finland, the Regional Council of Satakunta, Geological Survey of Finland and industrial plants and communities which take their water from the eskers.
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