A Thermo-Mechanical Model of the Inflation and Seismicity of Volcanic Calderas: An Application to the Campi Flegrei System
A thermo-mechanical model of calderas, based on the assumption that the rocks behave as no-tension materials, is proposed. The medium surrounding the magma chamber is considered, in compression, as a non-homogeneous elastic material — with elastic moduli depending on the temperature — and incapable of sustaining any tensile stress. This assumption allows us to follow the development of fractures at the ground surface and in the subsoil. The latter can be correlated with the localization of earthquake hypocentres and with the occurrence of eruptions. A finite element analysis of the model is performed. Comparisons between the ground surface deformations, observed at Campi Flegrei during the 1982–1984 crisis, and the deformations predicted by the model are developed. The proposed model seems to give a reasonable picture of many of the complex phenomena — ground uplift, fractures of the earth surface and in the subsoil, seismic activity — that occur in the volcanic area of Campi Flegrei.
KeywordsDuctility Drilling Como
Unable to display preview. Download preview PDF.
- Aster RC, Meyer RP, De Natale G, Zollo A, Martini M, del Pezzo E, Scarpa R, Iannuccone G (1992) Seismic Investigation of the Campi Flegrei (this vol.).Google Scholar
- Baidyuk BV (1969) Mechanical properties of rocks at high temperatures and pressures. Transi from Russian, Consultants Bureau, New York.Google Scholar
- Barberi F, Innocenti F, Lirer L, Munno R, Pescatore T (1978) The Campania Igninbrite: a major prehistoric eruption in the Neapolitan area (Italy). Bull Volcanol 41-1:1–22.Google Scholar
- Bruni P., Chelini W, Sbrana A, Verdiani G (1985) Deep exploration of the S Vito area, Pozzuoli, Naples: Well S. Vitol. Proc 3rd Int Sem Eur Geotherm Update, Munich 29 Nov–1 Dec 1983, EUR 8853 EN, pp 390-406.Google Scholar
- Como M, Lembo M (1988) Sull’istituzione di un modello termomeccanico del Bradisismo Flegreo. In: Omaggio a Giulio Ceradini. Dipart Ing Strutt Geotec, Univ Roma La Sapienza, Esagrafica, Roma, pp 249-263.Google Scholar
- Lama RD, Vutukuri VS (1978) Handbook on mechanical properties of the rock. Trans Tech Publ, Clausthal.Google Scholar
- Mogi K (1958) Relations between eruptions of various volcanoes and the deformations of the ground surface around them. Bull Earthq Res Inst Univ Tokio 36:99–134.Google Scholar
- Nadai A (1950) Theory of flow and fracture of solids. McGraw Hill, New York.Google Scholar
- Ortolani F, Pagliuca S (1984) Le lesioni nel suolo del centro storico di Pozzuoli⋯. Dipart Scie Terr, Univ Napoli.Google Scholar
- Parascandola A (1983) I fenomeni bradisismici del Serapeo di Pozzuoli, 1947. New printing, Genovese, Napoli.Google Scholar
- Romano G, Romano M (1985) Elastostatics of structures with unilateral conditions on strain and displacements. Int Conf Unilateral Probl Struct AnalInt Conf Unilateral Probl Struct Anal, Ravello, 1983, CISM, Springer Berlin Heidelserg New York, pp 315–338.Google Scholar