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AGU: Journal of Geophysical Research, Solid Earth

 

Keywords

  • Exploration geophysics
  • hydrothermal systems
  • volcanology
  • volcano monitoring
  • groundwater hydrology

Index Terms

  • Exploration Geophysics: General or miscellaneous
  • Volcanology: Hydrothermal systems
  • Volcanology: Volcano monitoring
  • Hydrology: Groundwater hydrology
Abstract
Cited By
 

Abstract

Geophysical and hydrogeological experiments from a shallow hydrothermal system at Solfatara Volcano, Campi Flegrei, Italy: Response to caldera unrest

Pier Paolo G. Bruno

Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Naples, Italy

Giovanni P. Ricciardi

Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Naples, Italy

Zaccaria Petrillo

Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Naples, Italy

Vincenzo Di Fiore

Consiglio Nazionale delle Ricerche, Istituto Per l'Ambiente Marino e Costiero, Naples, Italy

Antonio Troiano

Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Naples, Italy

Giovanni Chiodini

Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Naples, Italy

Integration of high-resolution geophysical and hydrogeological investigations at Solfatara Volcano, Campi Flegrei, Italy, allowed us to (1) image the shallow and intermediate subsurface to the crater, (2) elucidate patterns in the shallow subsurface degassing, and (3) refine and upgrade volcano-monitoring strategies for this dynamic area. Our results show that the subsurface to the crater can be divided roughly into two zones: a dry, outcropping layer overlying a horizon saturated by hydrothermal fluids. Within this saturated zone, intersections of dominant NW- and ENE-striking structural lineaments act as preferential escape conduits for the fluids which generate high microseismic noise amplitudes in the southeastern part of the crater. Hydrogeological data suggest an uprising of the isotherms below Solfatara crater, and a marked increment of fluid degassing, over the last 40 years. Sudden variations of both seismic noise level and noise cycling are positively correlated with early stages of ground inflation during the AD 2000 uplift. We believe therefore that monitoring of seismic noise can be used for upgrading early warning strategies in this sector of the Campi Flegrei volcanic system.

Received 8 March 2006; accepted 26 February 2007; published 5 June 2007.

Citation: Bruno, P. P. G., G. P. Ricciardi, Z. Petrillo, V. Di Fiore, A. Troiano, and G. Chiodini (2007), Geophysical and hydrogeological experiments from a shallow hydrothermal system at Solfatara Volcano, Campi Flegrei, Italy: Response to caldera unrest, J. Geophys. Res., 112, B06201, doi:10.1029/2006JB004383.

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