Abstract
The central sector of the Campi Flegrei volcano, including the Solfatara maar and Pisciarelli fumarole field, is currently the most active area of the caldera as regards seismicity and gaseous emissions and it plays a significant role in the ongoing unrest. However, a general volcano-tectonic reconstruction of the entire sector is still missing. This work aims to depict, for the first time, the architecture of the area through the application of deep Electrical Resistivity Tomography. We reconstructed a three-dimensional resistivity model for the entire sector. Results provide useful elements to understand the present state of the system and the possible evolution of the volcanic activity and shed solid bases for any attempt to develop physical-mathematical models investigating the ongoing phenomena.
Highlights
The central sector of the Campi Flegrei volcano, including the Solfatara maar and Pisciarelli fumarole field, is currently the most active area of the caldera as regards seismicity and gaseous emissions and it plays a significant role in the ongoing unrest
A deep electrical resistivity tomography (ERT) tomography of the central sector of the Campi Flegrei (CF) caldera was carried on through the use of several recording stations, acquiring the voltage drops at the end of a series of receiving dipoles
An alternative sketch of the 3D model is shown in Fig. 3a–c together with a detail of the large-scale structure of the Solfatara maar (Fig. 3d) and Pisciarelli fumarole field (Fig. 3e), as figured through the deep ERT imaging
Summary
The central sector of the Campi Flegrei volcano, including the Solfatara maar and Pisciarelli fumarole field, is currently the most active area of the caldera as regards seismicity and gaseous emissions and it plays a significant role in the ongoing unrest. Different unrest phenomena, such as ground deformation (bradyseism), earthquakes and diffuses degassing[11,12] preceded this eruption Phenomena of this kind occurred in the CF before the intense period of volcanism[13] and even in much more recent times. Since 2005 CE, the volcano entered a new phase of unrest, characterized by a strong endogenous degassing, with the extension of the area of carbon dioxide emissions and a slower ground rise with respect to the previous three main ground uplifts[15] In this context, the most active areas appear to be those of Solfatara maar and the adjacent Pisciarelli fumarole field (Fig. 1). One of the main unclear issues is connected to the extreme heterogeneity of the shallower part of the caldera, which involves the need for high-resolution geophysical surveys in order to distinguish the subsurface structures associated with different volcanic features
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