Abstract
ABSTRACTSince 1994, the Finnish Geodetic Institute has operated a superconducting gravimeter (SG) at the Metsähovi research station in southern Finland. Superconducting gravimeter measurements are very sensitive to different environmental effects due to their high precision and low drift (3 gal/year). In order to gain more complete knowledge of the measured data, we have worked extensively to discover and isolate different factors influencing SG data.In this study, we introduce one independent factor influencing SG data, i.e. the water flowing in the fractures of bedrock above the groundwater table. In order to estimate its effect on SG data, we conducted a ground‐penetrating radar survey to locate fractures below the gravity station. In addition, structural geology investigations were carried out to determine the type of fractures. On the basis of our studies, we constructed a 3D fracture model and calculated the effect that water‐filled fractures have on the gravity field at Metsähovi. The results of our calculations indicate that water flowing in the fractures at the Metsähovi site may cause an effect of several hundreds of nanogals.
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