Coda wave interferometric detection of seismic velocity changes associated with the 1999 M = 3.6 event at Mt. Vesuvius

Pandolfi, D.; Bean, Christopher J.; Saccorotti, Gilberto

doi:10.1029/2005gl025355

Cited by 32 publications

(23 citation statements)

References 18 publications

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“…The technique of 'coda wave interferometry' (Snieder et al 2002) estimates slight changes in the mean shear wave velocity from a comparison of multiple scattered seismic waves before and after a perturbation. Ratdomopurbo & Poupinet (1995), Pandolfi et al (2006) and Wegler et al (2006) applied this theory to seismograms recorded on an active volcano to monitor temporal variations of its structure. Poupinet et al (1984), Nishimura et al (2000) and Peng & Ben-Zion (2006) used the technique to infer a decrease of seismic velocity caused by a large nearby earthquake.…”

Section: Introductionmentioning

confidence: 99%

Fault zone monitoring with passive image interferometry

Wegler¹,

Sens‐Schönfelder²

2007

Geophysical Journal International

265

229

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SUMMARY The technique of passive image interferometry applies interferometric methods to correlation functions of seismic noise to monitor small temporal variations of the Earth interior. We computed the autocorrelation function of seismic noise recorded at a single seismometer located in the vicinity of the source region of the Mw= 6.6 Mid‐Niigata earthquake. Analysing the temporal evolution of the autocorrelation function, which is interpreted as the source–receiver collocated elastic wave Green's function, we detect a sudden decrease of relative seismic velocity in the Earth crust of −0.6 per cent that coincides with the occurrence of the earthquake. This drop of seismic velocity is likely to be caused by the change of stress in the source region of the earthquake.

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Section: Introductionmentioning

confidence: 99%

Fault zone monitoring with passive image interferometry

Wegler¹,

Sens‐Schönfelder²

2007

Geophysical Journal International

265

229

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“…The 3 events are thrust events with small dip angles dipping toward the Sumatra coast. The imaging of the rupture areas (14) Mechanisms that have been proposed for temporal changes of seismic velocity include (i) stress-induced changes of fault zone properties at seismogenic depth (3,5,10,16), (ii) damages from fault zone rupture and subsequent healing (4,17), (iii) damages of shallow crust from strong-ground shaking (18,19), and (iv) rapid changes in ground water near the surface (9) or fluid activities in shallow crust (20). The depth sensitivity of the observed Rayleigh wave temporal changes suggests that surface or shallow crust effects (mechanisms 3 or 4) can be ruled out.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Temporal changes of surface wave velocity associated with major Sumatra earthquakes from ambient noise correlation

Song

2009

Proc. Natl. Acad. Sci. U.S.A.

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“…(Cassano and La Torre 1987;Ventura and Vilardo 1999a). The M D 3.6 earthquake of 9 October 1999, with a hypocentral depth of 3 km below the top of Mount Vesuvius (the largest in the catalogue of INGV Vesuvian earthquakes), has been ascribed to cracking and/or fluid flow within the deep hydrothermal system (Pandolfi et al 2006). According to Zollo et al (2002), there was no significant departure from a pure shear double-couple mechanism during the onset of this event, thus suggesting a tectonic-like fracture mechanism.…”

Section: Introductionmentioning

confidence: 98%

The dynamics of a double-cell hydrothermal system in triggering seismicity at Somma-Vesuvius: results from a high-resolution radon survey (revisited)

Cigolini

2010

Bull Volcanol

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Data collected at Somma-Vesuvius during the 1998-1999 radon surveys have been revisited and reinterpreted in light of recent geophysical and geochemical information. The duration of selected radon anomalies, together with the decay properties of radon, have been used to estimate the permeability and porosity of rocks of the deep hydrothermal system. The current local cyclic seismicity is explained by means of a double convective-cell model. Convective cells are separated by a low-permeability horizon located at about 2-2.5 km below sea level. Fluids convecting within the upper cells show temperatures ranging 300-350°C. Rock permeabilities in this sector are estimated on the order of 10 −12 m 2 , for porosities () of about 10 −5 typical of a brittle environment where fluid velocities may reach ∼800 m/day. Fluid temperatures within the lower cells may be as high as 400-450°C, consistent with supercritical regimes. The hydrodynamic parameters for these cells are lower, with permeability k∼10 −15 m 2 , and porosity ranging from 10 −6 to 10 −7 . Here, fluid motion toward the surface is controlled by the fracture network within a porous medium approaching brittle-ductile behaviour, and fluid velocities may reach ∼1,800 m/day. The low-permeability horizon is a layer where upper and lower convecting cells converge. In this region, fluids (convecting both at upper and lower levels) percolate through the wallrock and release their brines. Due to selfsealing processes, permeability within this horizon reaches critical values to keep the fluid pressure near lithostatic pressure (for k∼10 −18 m 2 ). Deep fluid pressure buildups precede the onset of hydrothermally induced earthquakes. Permeability distribution and rock strength do not exclude that the next eruption at Somma-Vesuvius could be preceded by a seismic crisis, eventually leading to a precursory phreatic explosion. The coupling of these mechanisms has the potential of inducing pervasive failure within rocks of the hydrothermal shell, and may be a prelude to a magmatic eruption. It is finally emphasised that the integrated analysis of seismic and geochemical data, including radon emissions, could be successfully used in testing temperature distributions and variations of porosity and permeability in active geothermal reservoirs.

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Coda wave interferometric detection of seismic velocity changes associated with the 1999 M = 3.6 event at Mt. Vesuvius

Cited by 32 publications

References 18 publications

Fault zone monitoring with passive image interferometry

Fault zone monitoring with passive image interferometry

Temporal changes of surface wave velocity associated with major Sumatra earthquakes from ambient noise correlation

The dynamics of a double-cell hydrothermal system in triggering seismicity at Somma-Vesuvius: results from a high-resolution radon survey (revisited)

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