Summary
An isallo stress analysis of the fracture field in the area of Larderello, Italy, is carried out. Some of the general implications of the theory are discussed, and the local geological features of the area are briefly outlined. ThePHS direction is chosen on the basis of additional structural information. The inferred results are in satisfactory agreement with those expected from field geology, and a tentative attempt to a unitary explanation of the origin of the fracture field is made upon this basis.
Riassunto
Il sistema di fracture nella zona di Larderello in Italia è analizzato con l'aiuto della teoria interpretativa detta «isallo stress theory». Alcuni concetti di carattere generale vengono discussi, e le locali caratteristiche geologiche sono brevemente descritte. La direzione di massima compressione orizzontale (PHS) è scelta sulla base di considerazioni sulla tettonica della zona. I risultati cui si perviene sono in soddisfacente accordo con quelli postulati in base ad osservazioni di carattere puramente geologico, e permettono di avanzare una spiegazione unitaria dell'origine delle fratture.
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Ranalli, G., Scheidegger, A.E. An application of isallo stress theory to a surface fracture analysis of the Larderello area in Italy. PAGEOPH 73, 134–142 (1969). https://doi.org/10.1007/BF00875131
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DOI: https://doi.org/10.1007/BF00875131