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http://hdl.handle.net/2122/11366
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) | Journal: | Journal of Applied Geophysics | Series/Report no.: | /156 (2018) | Issue Date: | 2018 | DOI: | 10.1016/j.jappgeo.2017.06.001 | Keywords: | k-means Solfatara-Pisciarelli, Campi Flegrei Multivariate clustering Geophysical parameters Volcano-geothermal system |
Subject Classification: | 04.02. 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. |
Appears in Collections: | Article published / in press |
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1-s2.0-S092698511730544X-main.pdf | 3.51 MB | Adobe PDF | View/Open |
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