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Geophysical Prospection With the Lowfrequency Electromagnetic Method (CMD Mini-Explorer) and Using Integration Analysis of Multidimensional Data

On the basis of the results from the survey on the test site, we can conclude that the CMD can detect structures made of high resistivity materials. While choosing between coil configurations, one must take into account the nature of the geophysical targets and the approximate depth on which they are probably located. The HCP configuration is the most frequently used configuration. It can be very useful on archaeological sites where superimposed structures from different periods of human activities have been recognized. If the cultural layers are concentrated within 1m under the ground level the VCP method can be more useful. This method is suitable for sites located in carst, where the top geological layers can be detected near the ground level. However, we have noticed occasional polarity shifts within in-phase data when using VCP configuration, so we would advise additional survey with the magnetic methods. Our study has proven that the low-frequency EM method has a great potential for geophysical analysis of archaeological features on Iron Age sites. We can argue that this is an instrument which can produce detailed and precise data, even when used in manual mode with course sampling intervals. The sensor has a high sensitivity to subtle changes that can be influenced by traces of archaeological structures and various past activities.The soil and geology can also influence the data, thus making the interpretation difficult in some cases. Using the CMD in combination with other geophysical methods improves recognition of archaeological structures and activity areas. Integration of data collected with the multicoil system has also given positive results. In the future, we would like to extend the integration analysis by adding data from other geophysical methods. We consider that the integration of multidimensional geophysical data represents a more accurate way of anomaly identification within results of multi-method geophysical surveys on archaeological sites.

geophysical prospection, lowfrequency electromagnetic method, CMD Mini-Explorer, integration analysis of multidimensional data

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