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Authors: Di Giuseppe, Maria Giulia* 
Troiano, Antonio* 
Patella, D.* 
Piochi, Monica* 
Carlino, Stefano* 
Title: A geophysical k-means cluster analysis of the Solfatara-Pisciarelli volcano-geothermal system, Campi Flegrei (Naples, Italy)
Issue Date: 2018
Series/Report no.: /156 (2018)
DOI: 10.1016/j.jappgeo.2017.06.001
Keywords: k-means
Solfatara-Pisciarelli, Campi Flegrei
Multivariate clustering
Geophysical parameters
Volcano-geothermal system
Subject Classification04.02. Exploration geophysics 
Abstract: We present an application of the k-means cluster analysis technique to a trivariate geophysical parameter set dis- tributed over a 3 km thick and 1.2 km long section through the geothermally active Solfatara-Pisciarelli area of the Campi Flegrei caldera (Italy). The data set consists of resistivity, P-wave velocity and density parameters, ex- tracted from previously modeled univariate sections through the selected profile and mapped in a joint param- eter 3D space. Six compact and separated clusters have been identified. A subsequent linear regression statistics has allowed two distinct branches of clusters to be recognized, each represented in the joint parameter space by the equation of a plane. Each equation and its partial derivatives define the peculiar combinations among the used parameters. Once mapped back to the space domain, the final image has provided a grouping of the struc- tures in two superimposed blocks with an irregular interface located at 2 km mean depth. Based on drilling data, subsurface stratigraphy and recent seismic activity, the interface between the two blocks has been interpreted in terms of a substantial change in the rocks rheology inside the Solfatara-Pisciarelli volcano-geothermal system, namely the brittle-to-ductile transition.
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