Abstract
Seismic reflection profiles and sonographs provide the means of mapping bedrock type, sediments, and faults in Lake Thingvallavatn, SW-Iceland. The oldest part of the lake basin is formed in (Weichselian) hyaloclastites and a lava flow of probable interglacial (Eemian) age. Postglacial lavas (Thingvallahraun, Nesjarhaun) flowed into the basin and modified its shape as did eruptions within the lake (Sandey, Sklabrekkusker?). Tectonic movements appear to have been important in forming and maintaining the depression occupied by the lake throughout its history. The greatest displacements have occured within the grabben extending form Thingvellir in the north to the Hengill area in the south
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