Abstract
Small-scale buried structures in volcanic environments could present an extreme relevance, due to their link to the eruptive activity of individual monogenetic edifices, but require, to be detected, a high-resolution geophysical imaging. In such context, the Electrical Resistivity Tomography is often able to recover primary knowledge about the heterogeneity of the buried layers, despite the reduced investigation depth. In this paper an example of such matter is proposed, concerning the Posillipo hill, in the southeastern sector of the Campi Flegrei Caldera (Italy), where an electrical resistivity survey has been carried out in the roman age Seiano tunnel. In such a way, details of the Trentaremi tuff cone buried structure have been revealed, with a maximum depth of exploration of about 100 m. The obtained results have been compared with geological observations on the exposed rocks, interpreting their underground continuation. The geophysical image reconstructs the inner structure of the Trentaremi cone. At the same time, its relationships with respect to the deposits belonging to Neapolitan Yellow Tuff eruption have been highlighted. Reconstructing this stratigraphic sequence, indications about the past volcanic dynamics have been obtained, presenting valuable implications for the future activity forecasting.
Highlights
The geophysical imaging represents a powerful tool for acquiring detailed knowledge about the buried structures in a wide range of settings [Namson and Davis 1998, Bedrosian et al 2007, Troiano et al 2009]
The morphology of the Trentaremi tuff cone and its relationship with the surrounding deposits highlights knowledge about the volcanism occurred between the two main events that formed the caldera, the Campanian Ignimbrite (CI) and the Neapolitan Yellow Tuff (NYT)
The Coroglio and Trentaremi cliffs, on the southwestern side of the hill, constitutes its rocky front, directly exposed to the wave erosion action, that was formed during the large caldera collapse associated to the Neapolitan Yellow Tuff (NYT) eruption, at 15 ka [Deino et al 2004]
Summary
The geophysical imaging represents a powerful tool for acquiring detailed knowledge about the buried structures in a wide range of settings [Namson and Davis 1998, Bedrosian et al 2007, Troiano et al 2009]. The buried structures of the Trentaremi Tuff Cone, located in the southeastern sector of the caldera, are investigated (Figure 1).
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