Complex geological geophysical investigations on the site of Tihany


Csontos A., Tildy P.



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