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| Titel |
The stress field in Campi Flegrei caldera by joint inversion of seismological and ground deformation data |
| VerfasserIn |
Elena Cristiano, Luca D'Auria, Bruno Massa, Carlo Del Gaudio, Flora Giudicepietro, Giovanni Ricciardi, Ciro Ricco |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091250
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| Publikation (Nr.) |
 EGU/EGU2014-5530.pdf |
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| Zusammenfassung |
| Campi Flegrei caldera is an active volcanic complex characterized, in the last decades, by seismic activity, gas emissions and ground deformation. On the period 1982-84, a bradyseismic crisis, with a total uplift of about 2 m, accompanied by intense seismicity, affected this area. The aim of this work is to determine the spatial and temporal variations of the stress field within Campi Flegrei caldera by applying a joint inversion of geodetic and seismological data.
Geodetic data consist in about 1100 optical levelling measurements in the interval 1982-1985. The non-linear inversion of the data has shown that the best-fit source, for this interval, is a simple sub-horizontal Okada crack. Our hypothesis is that the stress field within the caldera results from: gravity, the Okada source and a background regional stress. To determine the latter field we used a seismological dataset consisting of 265 focal mechanisms related to the interval 1983-1984.
Applying different stress-inversion methods (multi-inverse, RDM and RTM) we have determined a time-varying stress field in that area and using a non-linear approach we have determined the best-fit regional stress tensor.
Results show that most of the stress field of the area is mainly related to the volcanic source, showing a nearly vertical sigma1 axis and a sub-horizontal sigma3. A weak extensional N-S regional stress field drives the orientation of the sigma3 axes. |
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