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netically fully saturated material. Unmagnetized specimens could not be measured because the attenuation was too high.We therefore determined the longitudinal wave velocity of a 99.6% dense polycrystalline specimen of Mno.49Zno.4sF%.o604. The measured value of 7.190kmsec -1 agrees very well with the one calculated from the single crystal elastic constants (7.157 km sec-1) according to the Voigt-Reuss-Hill or Hashin-Shtrikman averaging scheme. In our case too, excessive damping prevented the measurement of the shear-wave velocity in polycrystalline ferrite.

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The purpose of this study is to analyze the surface temperature and the distribution of thermal signatures on Tuscany’s geothermal districts using data obtained through three separate surveys via satellite and an unmanned aerial vehicle (UAV). The analysis considers the highest available spatial resolution ranging from hundreds of meters per pixel of the satellite thermal images and the tenths/hundreds of centimeters per pixel of the thermal images acquired by the UAV. The surface temperature maps obtained by satellite data acquired at suitable spatial resolution and the thermal measurements obtained by the thermal camera installed on the UAV were orthorectified and geocoded. This allowed, for example, following the evolution of thermal anomalies, which may represent a modification of the current state of the geothermal field and a possible hazard for both the population and industrial assets. Here, we show the results obtained in three field campaigns during which the simultaneous acquisition of Landsat 8 satellite and UAV (FlyBit octocopter, IDS, Rome, Italy) thermal data were analyzed. By removing the atmosphere contribution from Landsat 8 data, we have produced three surface temperature maps that are compared with the ground field measurements and the surface temperature maps elaborated by FLIR VUE PRO-R on the UAV.

Electrical resistivity tomography (ERT) and ground penetrating radar (GPR) surveys were conducted in the Anghelu Ruju hypogeic necropolis in northern Sardinia (Italy). The main purpose was to calibrate both techniques on a known and already dug tomb. After the calibration the survey was extended to a neighbouring unexplored area with the aim to demonstrate new hypogeic structures. A comparison of the high‐resolution GPR and ERT models was made, and their results are discussed in terms of providing a more complete picture that would not be attainable using a single method. Several anomalies were identified that might represent previously unknown rock‐cut tombs and burial sites in the central part of the investigated area.