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| Titel |
New insight in the seismicity pattern at the Campi Flegrei caldera |
| VerfasserIn |
Francesca Bianco, Mario Castellano, Paola Cusano, Luca De Siena, Simona Petrosino |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250042689
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| Zusammenfassung |
| Campi Flegrei (CF) volcanic complex is a nested
caldera located in a densely populated area (∼1.5 million
inhabitants) west of Naples, Southern Italy. Its evolution has been characterized by many eruptive episodes,
the last one occurred in 1538 a.d. The most
prominent feature of CF activity is the widely known
phenomenon called “bradyseism”, consisting of noticeable,
fast ground uplifts followed by slow subsidence
phases. The most recent bradyseismic crisis occurred in 1982–1984, during which a net uplift of 1.8m centered on Pozzuoli town was accompanied by more than 16,000 earthquakes (Mmax = 4.0) mostly located beneath
the Pozzuoli–Solfatara area. After that, two episodes of bradyseism with a net uplift of 6 cm occured in 2000 and in 2002 - 2006. In order to define the seimogenetic volume related to the 3 crisis occurred in the last 30 years, we evaluated the locations of the recorded VT seismicity by inverting P- and S-wave arrival times following a probabilistic grid search approach. Theoretical travel times at the different stations are obtained in a 3D velocity structure derived from a recent tomographic experiment. The source parameters share compatible values for the 3 crisis suggesting, together with a general agreement in the spatial distribution of the sources, a common mechanism for the 3 bradyseismic episodes. |
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