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Complex geological geophysical investigations on the site of Tihany observatory |
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Csontos A., Tildy P. |
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One of the most important challenges before the creation a new magnetic observatory is the site selection. Decision-makers should fulfil several requirements regarding to the local surroundings, existent and possible natural and artificial electromagnetic disturbances too. (As an example artificial magnetic disturbances are very common problem of the present-day observatory work.). In general all of the expectations cannot be fully satisfied, some kind of optimal decision is desirable. On the other hand the modern measurement technologies ensures higher data quality. The experiences based on high quality data sets could also encourage the study of the local geological structures. Tihany Geophysical Observatory was built on a geyser-cone on the souther part of Tihany Peninsula on the shore of Lake Balaton, Hungary. Geomagnetic survey was performed on the peninsula, the results of which formed the basis of site selection. An appearance of little systematic baseline instability motivates us to perform a detailed geophysical survey on the site including electric resistivity tomography and geomagnetic measurements. Soil samples were also collected based on the measurement results, on which X-ray powder diffraction measurement were completed to identify the minerals of the sediments. After these investigations deposits with different magnetic properties could be linked to structures created by hydrothermal processes. Our poster will present the results and conclusions of the investigation carried out. The interpretation of different measurements can give a perfect help to understand the spatial distribution of the detected baseline instabilities. |
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Measurements |
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poster |
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