Space‐weighted seismic attenuation mapping of the aseismic source of Campi Flegrei 1983–1984 unrest

Coda wave attenuation imaging is able to detect fluid/melt accumulation and ancient magmatic bodies in volcanoes. Here we use recently developed space‐weighting sensitivity functions to invert for the spatial distributions of multifrequency coda wave attenuation ( Qc−1), measured during the largest...

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Bibliographic Details
Published in:Geophysical research letters 2017-02, Vol.44 (4), p.1740-1748
Main Authors: De Siena, L., Amoruso, A., Pezzo, E. Del, Wakeford, Z., Castellano, M., Crescentini, L.
Format: Article
Language:English
Subjects:
Anomalies
Attenuation
Calderas
Campi Flegrei
Circulation
coda waves
Computational fluid dynamics
Deformation
Deformation mechanisms
Fluid mechanics
Fluids
Hazards
Hydrothermal activity
Magma
Mapping
Ocean circulation
Plate tectonics
Seismic surveys
Seismicity
Seismology
Spatial distribution
tomography
Volcanic eruptions
volcanic unrest
Volcanoes
Wave attenuation
Wavelength
Wavelengths
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Summary:Coda wave attenuation imaging is able to detect fluid/melt accumulation and ancient magmatic bodies in volcanoes. Here we use recently developed space‐weighting sensitivity functions to invert for the spatial distributions of multifrequency coda wave attenuation ( Qc−1), measured during the largest monitored unrest at Campi Flegrei caldera (1983–1984). High‐attenuation anomalies are spatially correlated with the regions of highest structural complexities and cross faulting. They characterize deep fluid circulation in and around the aseismic roots of the 1534 A.D. Mount Nuovo eruption and fluid accumulation in the areas of highest hydrothermal hazard. Just offshore Pozzuoli, and at the highest frequency (wavelengths of ∼150 m), the main cause of ground deformation and seismicity during the unrest is an aseismic low‐attenuation circular anomaly, similar in shape and nature to those produced by ancient magmatic reservoirs and active sills at other volcanoes. Key Points Space‐weighted seismic attenuation mapping reconstructs the sources of the major monitored unrest at Campi Flegrei caldera High attenuation and seismicity highlight structurally controlled fluid migration and the two main zones of hydrothermal hazard Low attenuation at high frequencies supports the presence of an aseismic ancient/active magma body offshore Pozzuoli
ISSN:0094-8276
1944-8007
DOI:10.1002/2017GL072507