Crustal dynamics of Mount Vesuvius from 1998 to 2005: Effects on seismicity and fluid circulation

Madonia, Paolo; Federico, C.; Cusano, Paola; Petrosino, Simona; Aiuppa, Alessandro; Gurrieri, Sergio

doi:10.1029/2007jb005210

Cited by 22 publications

(23 citation statements)

References 63 publications

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“…Saccorotti et al [] linked variations in the seismicity pattern with the propagation of hydrological transients. Madonia et al [] found a temporal relationship between changes in geochemical parameters and the seismicity suggesting a link between the dynamics of the hydrothermal system and the earthquake occurrence. D'Auria et al [] found a difference in the distribution of P and T axes between events located above and below the sea level, postulating the existence of two different stress regimes and seismogenic mechanisms.…”

Section: Introductionmentioning

confidence: 99%

The stress field beneath a quiescent stratovolcano: The case of Mount Vesuvius

D’Auria

Massa

Matteo

2014

J. Geophys. Res. Solid Earth

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We have analyzed a focal mechanism data set for Mount Vesuvius, consisting of 197 focal mechanisms of events recorded from 1999 to 2012. Using different approaches and a comparison between observations and numerical models, we have determined the spatial variations in the stress field beneath the volcano. The main results highlight the presence of two seismogenic volumes characterized by markedly different stress patterns. The two volumes are separated by a layer where the seismic strain release shows a significant decrease. Previous studies postulated the existence, at about the same depth, of a ductile layer allowing the spreading of the Mount Vesuvius edifice. We interpreted the difference in the stress pattern within the two volumes as the effect of a mechanical decoupling caused by the aforementioned ductile layer. The stress pattern in the top volume is dominated by a reverse faulting style, which agrees with the hypothesis of a seismicity driven by the spreading process. This agrees also with the persistent character of the seismicity located within this volume. Conversely, the stress field determined for the deep volume is consistent with a background regional field locally perturbed by the effects of the topography and of heterogeneities in the volcanic structure. Since the seismicity of the deep volume shows an intermittent behavior and has shown to be linked to geochemical variations in the fumaroles of the volcano, we hypothesize that it results from the effect of fluid injection episodes, possibly of magmatic origin, perturbing the pore pressure within the hydrothermal system.

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Section: Introductionmentioning

confidence: 99%

The stress field beneath a quiescent stratovolcano: The case of Mount Vesuvius

D’Auria

Massa

Matteo

2014

J. Geophys. Res. Solid Earth

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“…The gas geochemistry anomalies observed at TVG may be attributed to three generic mechanisms (Madonia et al, 2008 and references therein): (a) variations of a degassing magma source, (b) changes in rock permeability due to the opening of new cracks, and (c) hydrological modifications due to fluctuations of the quantity of meteoric water in the system. Even though the geochemical measurements during [2004][2005] show no apparent correlation with the normalized seismic energy, it is interesting to note the temperature increase during 2005.…”

Section: Dynamics Of the Volcano-hydrothermal Systemmentioning

confidence: 99%

“…The choice of this passband is dictated by the small signal-to-noise ratio we encountered when trying to perform the inversions at lower frequencies (0.08-0.1 Hz), resulting in inverting noise rather than the earthquake signal. As the frequency range we chose is quite high, we focus on fitting just the first few seconds of each waveform in a similar way to that done by Madonia et al (2008) for a small event at Vesuvius. Green's functions were calculated for a depth range 1-9 km with a step of 0.5 km using the method of wavenumber integration and utilizing the minimum 1-D velocity model to approximate the upper crustal structure.…”

Section: Source Properties Of the 24 April Earthquakementioning

confidence: 99%

“…Geochemical monitoring of fumarolic gases and spring water could also be expected to provide important information regarding changes in the magmatic-hydrothermal system. In many cases the combination of these methodologies has proved very effective in constraining the source of fluids (magmatic versus hydrothermal) and their path through the crust (Moran et al, 2000;Tassi et al, 2004;Madonia et al, 2008;Martini et al, 2010 among others). Additionally, an understanding of the relation between background seismicity, fumarolic chemistry and previous volcanic eruptions can help to establish a baseline against which any future changes in the volcano-magmatic system can be evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Multi-parametric investigation of the volcano-hydrothermal system at Tatun Volcano Group, Northern Taiwan

Rontogianni

Konstantinou

Lin

2012

Nat. Hazards Earth Syst. Sci.

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Abstract. The Tatun Volcano Group (TVG) is located in northern Taiwan near the capital Taipei. In this study we selected and analyzed almost four years (2004)(2005)(2006)(2007) of its seismic activity. The seismic network established around TVG initially consisted of eight three-component seismic stations with this number increasing to twelve by 2007. Local seismicity mainly involved high frequency (HF) earthquakes occurring as isolated events or as part of spasmodic bursts. Mixed and low frequency (LF) events were observed during the same period but more rarely. During the analysis we estimated duration magnitudes for the HF earthquakes and used a probabilistic non-linear method to accurately locate all these events. The complex frequencies of LF events were also analyzed with the Sompi method indicating fluid compositions consistent with a misty or dusty gas. We juxtaposed these results with geochemical/temperature anomalies extracted from fumarole gas and rainfall levels covering a similar period. This comparison is interpreted in the context of a model proposed earlier for the volcano-hydrothermal system of TVG where fluids and magmatic gases ascend from a magma body that lies at around 7-8 km depth. Most HF earthquakes occur as a response to stresses induced by fluid circulation within a dense network of cracks pervading the upper crust at TVG. The largest (M L ∼ 3.1) HF event that occurred on 24 April 2006 at a depth of 5-6 km had source characteristics compatible with that of a tensile crack. It was followed by an enrichment in magmatic components of the fumarole gases as well as a fumarole temperature increase, and provides evidence for ascending fluids from a magma body into the shallow hydrothermal system. This detailed analysis and previous physical volcanology observations at TVG suggest that the region is volcanically active and that measures to mitigate potential hazards have to be considered by the local authorities.

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“…Recently, the area has seen three unrest episodes, in 1970-1972, in 1982-1984 and in 2010-2012, which were characterized by large ground deformation, changes in geochemical signals at the surface and some limited seismicity (e.g. Madonia et al 2008). As part of the Phlegrean Fields, the Solfatara crater is a 0.4 × 0.5 km subrectangular structure whose geometry is mainly due to the control exerted by N40-50W and N50E trending normal fault systems (Petrosino et al 2012), along which geothermal fluids can ascend.…”

Section: T H E S O L Fata R a C R At E R : C H A R A C T E R I S T I mentioning

confidence: 99%

A 3D algorithm based on the combined inversion of Rayleigh and Love waves for imaging and monitoring of shallow structures

2017

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S U M M A R YIn recent years, there has been increasing interest in the study of seismic noise interferometry as it can provide a complementary approach to active source or earthquake-based methods for imaging and continuous monitoring the shallow structure of the Earth. This meaningful information is extracted from wavefields propagating between those receiver positions at which seismic noise was recorded. Until recently, noise-based imaging relied mostly on Rayleigh waves. However, considering similar wavelengths, a combined use of Rayleigh and Love wave tomography can succeed in retrieving velocity heterogeneities at depth due to their different sensitivity kernels. Here, we present a novel one-step algorithm for simultaneously inverting Rayleigh and Love wave dispersion data aiming at identifying and describing complex 3-D velocity structures. The algorithm may help to accurately and efficiently map the shear wave velocities and the Poisson ratio of the surficial soil layers. In the high-frequency range, the scattered part of the correlation functions stabilizes sufficiently fast to provide a reliable estimate of the velocity structure not only for imaging purposes but also allows for changes in the medium properties to be monitored. Such monitoring can be achieved with a high spatial resolution in 3-D and with a time resolution as small as a few hours. In this paper, we describe a recent array experiment in a volcanic environment in Solfatara (Italy) and we show that this novel approach has identified strong velocity variations at the interface between liquids and gas-dominated reservoirs, allowing localizing a region which is highly dynamic due to the interaction between the deep convection and its surroundings.

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Crustal dynamics of Mount Vesuvius from 1998 to 2005: Effects on seismicity and fluid circulation

Cited by 22 publications

References 63 publications

The stress field beneath a quiescent stratovolcano: The case of Mount Vesuvius

The stress field beneath a quiescent stratovolcano: The case of Mount Vesuvius

Multi-parametric investigation of the volcano-hydrothermal system at Tatun Volcano Group, Northern Taiwan

A 3D algorithm based on the combined inversion of Rayleigh and Love waves for imaging and monitoring of shallow structures

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