Publication Date:
2019-03-05
Description:
An edited version of this paper was published by AGU. Copyright (2010) American Geophysical Union.
Description:
Passive high‐resolution attenuation tomography is used here to image the geological
structure in the first upper 4 km of the shallow crust beneath the Campi Flegrei caldera,
southern Italy. The inverse Q was estimated for each source‐receiver path using the
coda‐normalization method (S‐waves) and the slope decay method (P‐waves and S‐waves).
Inversion was performed using a multi‐resolution method, which ensures a minimum
cell‐size resolution of 500 m. The study of the resolution matrix as well as the synthetic tests
guarantee an optimal reproduction of the input anomalies in the center of the caldera,
between 0 and 3.5 km in depth. High attenuation vertical structures are connected at the
surface with the main volcanological features (e.g., the Solfatara and Mofete fumarole
fields), and depict vertical Q contrast imaging important geological structures, such as the
La Starza fault. These high attenuation volumes extend between the surface and a depth
of about 3 km, where a hard rock layer is imaged by the sharp contrast of the quality factors.
The retrieved image of the Campi Flegrei has been jointly interpreted taking into account
evidence from seismological, geological, volcanological and geochemical investigations.
This analysis has allowed an unprecedented view of the feeding systems in this area, and in
particular it recognizes the vertically extending, high attenuation structures that correspond
to gas or fluid reservoirs beneath Pozzuoli‐Solfatara, Solfatara, Mofete‐Mt. Nuovo and
Agnano. This high‐attenuation system is possibly connected with the magma sill
revealed at about 7 km in depth by passive travel‐time tomography.
Description:
Published
Description:
B09312
Description:
1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
Description:
3.1. Fisica dei terremoti
Description:
JCR Journal
Description:
reserved
Keywords:
Campi Flegrei
;
gas
;
04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
;
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
;
04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
;
05. General::05.01. Computational geophysics::05.01.03. Inverse methods
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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