Ambient Seismic Noise Image of the Structurally Controlled Heat and Fluid Feeder Pathway at Campi Flegrei Caldera

L. de Siena, C. Sammarco, D. G. Cornwell, M. La Rocca, F. Bianco, L. Zaccarelli, H. Nakahara

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Abstract

Earthquakes at Campi Flegrei have been low-magnitude and sparse since 1985, denying on-shore monitoring observations of their usual source for structural constraint: seismic tomography. Here, we used continuous seismic records
from 2011-13 to reconstruct period-dependent Rayleigh-wave group-velocity maps of the volcano. The Neapolitan Yellow Tuff rim faults bound high-velocity intra-crater products of historical eruptions, which act as a barrier for deep fluid migration. The anomaly with lowest group velocity is aseismic and corresponds
to the portion of a fluid-storage zone that was fractured during the 1984 volcanic unrest under Pozzuoli town. Earthquake locations show that fluids migrate from this area towards the Solfatara and Pisciarelli fumaroles along shallower low-velocity fractures. The aseismic anomaly is likely fed by a deep-seated offshore magmatic source. Its spatial relation with regional dynamics and observations from historical unrests mark the area as the most likely feeder
pathway for fluid and magmatic inputs from depth.
Original languageEnglish
Pages (from-to)6428-6436
Number of pages9
JournalGeophysical Research Letters
Volume45
Issue number13
Early online date5 Jul 2018
DOIs
Publication statusPublished - 16 Jul 2018

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seismic noise
feeders
calderas
caldera
heat
fluid
fluids
group velocity
low speed
earthquakes
anomalies
anomaly
wave group
earthquake
fumarole
seismic tomography
Rayleigh waves
Rayleigh wave
rims
tuff

Keywords

  • Ambient noise imaging
  • Volcano imaging
  • Fluid Propagation
  • Seismicity
  • Volcano dynamics
  • Seismic scattering

Cite this

Ambient Seismic Noise Image of the Structurally Controlled Heat and Fluid Feeder Pathway at Campi Flegrei Caldera. / de Siena, L.; Sammarco, C.; Cornwell, D. G.; La Rocca, M.; Bianco, F.; Zaccarelli, L.; Nakahara, H.

In: Geophysical Research Letters, Vol. 45, No. 13, 16.07.2018, p. 6428-6436.

Research output: Contribution to journalArticle

de Siena, L. ; Sammarco, C. ; Cornwell, D. G. ; La Rocca, M. ; Bianco, F. ; Zaccarelli, L. ; Nakahara, H. / Ambient Seismic Noise Image of the Structurally Controlled Heat and Fluid Feeder Pathway at Campi Flegrei Caldera. In: Geophysical Research Letters. 2018 ; Vol. 45, No. 13. pp. 6428-6436.
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abstract = "Earthquakes at Campi Flegrei have been low-magnitude and sparse since 1985, denying on-shore monitoring observations of their usual source for structural constraint: seismic tomography. Here, we used continuous seismic recordsfrom 2011-13 to reconstruct period-dependent Rayleigh-wave group-velocity maps of the volcano. The Neapolitan Yellow Tuff rim faults bound high-velocity intra-crater products of historical eruptions, which act as a barrier for deep fluid migration. The anomaly with lowest group velocity is aseismic and correspondsto the portion of a fluid-storage zone that was fractured during the 1984 volcanic unrest under Pozzuoli town. Earthquake locations show that fluids migrate from this area towards the Solfatara and Pisciarelli fumaroles along shallower low-velocity fractures. The aseismic anomaly is likely fed by a deep-seated offshore magmatic source. Its spatial relation with regional dynamics and observations from historical unrests mark the area as the most likely feederpathway for fluid and magmatic inputs from depth.",
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note = "The TIDES-COST Action (STSM-ES1401-34011) provided a travel grant to framework the research project. The Japan Society for the Promotion of Science - Short-Term Fellowship (JSPS/OF215/022) financed the work, undertaken at Tohoku University and concluded at the University of Aberdeen. We thank Giuseppe Vilardo and Eliana Bellucci Sessa for providing the geomorphological maps, and Simona Petrosino and Paola Cusano for the P- and S-wave pickings used to localise the seismicity. Informal revisions from Guido Ventura, Nick Rawlinson and Chris Kilburn helped us improving the analyses and interpretation, respectively. We acknowledge the help of Naveed Khan in parallelising the codes and two anonymous reviewers who improved the analysis, interpretation, and readibility with their comments. All data to reproduce the maps can be downloaded from the World Data Center PANGAEA data repository, permanent link https://doi.pangaea.de/10.1594/PANGAEA.890238.",
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AU - Nakahara, H.

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N2 - Earthquakes at Campi Flegrei have been low-magnitude and sparse since 1985, denying on-shore monitoring observations of their usual source for structural constraint: seismic tomography. Here, we used continuous seismic recordsfrom 2011-13 to reconstruct period-dependent Rayleigh-wave group-velocity maps of the volcano. The Neapolitan Yellow Tuff rim faults bound high-velocity intra-crater products of historical eruptions, which act as a barrier for deep fluid migration. The anomaly with lowest group velocity is aseismic and correspondsto the portion of a fluid-storage zone that was fractured during the 1984 volcanic unrest under Pozzuoli town. Earthquake locations show that fluids migrate from this area towards the Solfatara and Pisciarelli fumaroles along shallower low-velocity fractures. The aseismic anomaly is likely fed by a deep-seated offshore magmatic source. Its spatial relation with regional dynamics and observations from historical unrests mark the area as the most likely feederpathway for fluid and magmatic inputs from depth.

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