Monumental tumuli are important monuments of past human activity, and may contain burial structures of high cultural and historicalvalue. Seismic tomography is used toinvestigate the internal structure of a monumental tumulus.Energy sources and recorders are placed on the periphery at the base of the tumulus.Travel time data are analysed and processed with three-dimensional tomographic inversion in order to construct images of the distribution of seismic velocity in the interiorof the tumulus. Velocity variations are known to correlate well with the lithological character of the earth materials, thus providing important structural and lithological information of the tumulus. A case history from a Macedonian tumulusin northern Greeceispresented.The results are interpretedin terms of evidence for possible man-made buried structures, such as tombs, walls, etc.; three-dimensional modelling is used to assist in the interpretation and evaluation of the significance and reliability of the results.

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Summary. Geomagnetic declination and inclination secular variation curves have been constructed back to 6000 yr bp from palaeomagnetic measurements of sediments cored in Lakes Volvi, Trikhonis and Begoritis, Greece. They have been dated by palynological studies and by comparison with observatory and archaeomagnetic records. Radiocarbon ages are all affected by the‘old carbon’factor. Cores from all three lakes contain a thin ash layer which we associate with the Pompeii eruption of Vesuvius in ad 79. Averaged curves of secular variations of declination and inclination have been computed for the whole study. The broader scale pattern of secular variations is basically similar to lake sediment records from the UK, Poland and Switzerland, though finer detail in the structure of some of the principal features is resolved.

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