Geophysical Exploration of the Campi Flegrei (Southern Italy) Caldera' Interiors: Data, Methods and Results. Edited by Aldo Zollo, Paolo Capuano, Margherita Corciulo, 2006
New tomographic 3D Qp and Qs images of the Campi Flegrei have been built by inverting the whole data set of the microearthquakes recorded during the 1984 seismic crisis. In both the inversions the uppermost crust (between 0 and 3 km of depth) was subdivided in 189 cells having a volume of 1*1*1 km3. The residual reduction is statistically significant in both the cases, but the relative error on Q, as inferred by using the random deviates technique, is generally high. This indicates that a future effort has to be made to better constrain the obtained images by inserting an additional grid layer between 3 and 4 km of depth and/or using irregular grids to account for the higher spatial resolution in the central eastern part of the caldera. The inferred 3D Qp images substantially confirm the result of a previous tomographic study in the area (de Lorenzo et al., 2001 a&b). The 3D Qs maps show some interesting new features, such as a surface positive anomaly located slightly south of Monte Nuovo where the last eruption (1538 a.d) took place.