Aseismic strain episodes at Campi Flegrei Caldera, Italy Journal Article uri icon

Overview

abstract

  • Abstract. Since 2004 a research project has been developed to; monitor subsurface deformation of Italian volcanoes using borehole; strainmeters and long-baseline tiltmeters. Six Sacks-Evertson dilatometers; were installed around Campi Flegrei caldera and Vesuvius during 2004–2005; (Scarpa et al., 2007), and in 2008 these instruments were supplemented by; two arrays of 28–280 m long water-tube tiltmeters in underground tunnels. Relevant strainmeter and tiltmeter data have been collected and analysed; from the instruments installed near Campi Flegrei caldera during the recent; unrest episodes. In the period 2004–2005 strain, tilt and GPS data from; Campi Flegrei indicate the onset of surface deformation that accompanied a; low rate of vertical displacement that continued to 2006, corresponding to; an increase of CO2 emission. This strain episode preceded caldera; microseismic activity by a few months, as was observed also during a; significant inflation episode in 1982. Other transient strain episodes; occurred in October 2006, which were accompanied by a swarm of VT; (Volcano-Tectonic) and LP (Long Period) events, in 2009, at the time of; renewed gas emission activity at Solfatara, and again in March 2010, several; minutes before a seismic swarm. The time scale of these transient strain; events ranges from some hours to several days, putting tight constraints on; the origin of ground uplifts at Campi Flegrei. Their location is compatible; with a source inferred from long term deformation signals, located about 4 km beneath Pozzuoli. A proposed mechanism for these aseismic strain episodes; is that they are associated with magma growth in reservoirs with occasional; pressure relief associated with the leakage of gas.;

publication date

  • February 18, 2021

has restriction

  • gold

Date in CU Experts

  • October 15, 2021 2:19 AM

Full Author List

  • Di Lieto B; Romano P; Bilham R; Scarpa R

author count

  • 4

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 1680-7359

Additional Document Info

start page

  • 119

end page

  • 129

volume

  • 52