Publication Date:
2020-02-24
Description:
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 attenuation.
The horizontal P-wave scattering attenuation structure below Campi Flegrei Caldera
(CFC) is imaged using the autocorrelation functions (ACF) of P-wave vertical velocity fluctuations.
Cluster analysis (CA) is then applied to interpret the images derived from ACF and
the available P-wave total attenuation images at 2000m quantitatively. The analysis allows
the separation of intrinsic and scattering attenuation on a 2-D plane, adding new geophysical
constraints 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
dissipation dominates in an area approximately located under the volcanic centre of Solfatara,
as expected in a region with a large presence of fluids and gas. A north–south scattering
attenuation 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 Mt Nuovo.
This evidence favours 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.
Description:
Published
Description:
1304-1310
Description:
3.1. Fisica dei terremoti
Description:
JCR Journal
Description:
reserved
Keywords:
Probability distributions
;
Seismic attenuation
;
Seismic tomography
;
Statistical seismology
;
04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
