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| Titel |
A scattering Image of Campi Flegrei from the Auto Correlation Functions of Velocity tomograms |
| VerfasserIn |
Edoardo Del Pezzo, Francesca Bianco, Luca De Siena |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046517
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| Zusammenfassung |
| We propose a new quantitative approach for the joint interpretation of velocity and attenuation tomography images, performed through the lateral separation of scattering and intrinsic atten- uation. The horizontal P-wave scattering attenuation structure below Campi Flegrei Caldera (CFC) is imaged using the Auto Correlation Functions (ACF) of P-wave vertical velocity fluc- tuations. Cluster Analysis (CA) is then applied to interpret the images derived from ACF and the available P-wave total attenuation images at 2000 m quantitatively. The analysis allows the separation of intrinsic and scattering attenuation on a 2D plane, adding new geophysical con- straints to the present knowledge about this volcanic area. The final result is a new, quantitative image of the past and present tectonic and volcanological state of CFC. P-wave intrinsic dis- sipation dominates in an area approximately located under the volcanic center of Solfatara, as expected in a region with a large presence of fluids and gas. A North-South scattering attenua- tion region is mainly located below the zone of maximum uplift in the 1982-1984 bradiseismic crisis, in the sea side of the Pozzuoli bay, but also extending below Mount Nuovo. This ev- idence favors the interpretation in terms of a hard but fractured body, contoured by strong S-wave scatterers, corresponding to the caldera rim: the region is possibly a section of the residual magma body, associated with the 1538 eruption of Mt. Nuovo. |
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