The onset of the 2007 Stromboli effusive eruption recorded by an integrated geophysical network

Ripepe, Maurizio; Donne, Dario Delle; Lacanna, Giorgio; Marchetti, E.; Ulivieri, Giacomo

doi:10.1016/j.jvolgeores.2009.02.011

Cited by 81 publications

(97 citation statements)

References 16 publications

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“…[8] Our department is recording volcanic activity at Stromboli by an integrated geophysical network of five broadband seismometers, one five-elements infrasonic array and two thermal cameras [Ripepe et al, 2009]. Seismic stations are equipped with a Guralp CMG-40T (natural period 30 s) broadband seismometer and a pressure transducer, both recorded at a sampling rate of 100 sps.…”

Section: Tilt Stationsmentioning

confidence: 99%

Inflation‐deflation cycles revealed by tilt and seismic records at Stromboli volcano

Genco

Ripepe

2010

Geophysical Research Letters

105

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[1] Strombolian activity is driven by gas dynamic, where large quantities of volatiles are first exsolved and then suddenly released, ejecting fragmented lava at ∼100-300 m height with exit velocities of 20-70 m/s. This conduit process is detected as VLP seismicity only in the final stage (<10 s before the explosion), when the rising gas slug interacts with the shallower part (last 200-300 m) of the feeding conduits. We present new ground deformation recorded with high-resolution tiltmeters (1 nrad) sampled at 1 Hz and detected by broad-band seismometers that extends the perception of this explosive process. Tiltmeters and seismometers reveal that the explosive process is accompanied by a persistent deformation of the ground detected as small (<100 nrad) inflation-deflation cycles ∼250 s long and associated with the constant process of gas recharge and discharge of the magma conduit.Citation: Genco, R., and M. Ripepe (2010), Inflation-deflation cycles revealed by tilt and seismic records at Stromboli volcano,

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Section: Tilt Stationsmentioning

confidence: 99%

Inflation‐deflation cycles revealed by tilt and seismic records at Stromboli volcano

Genco

Ripepe

2010

Geophysical Research Letters

105

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“…3, 4). Although this gives support to the validity of the method, introducing an arbitrary threshold of anomalous deformation of the crater terrace between background activity and unrest would just push this issue into a different parameter with respect to those proposed already by several authors (Aiuppa et al 2009;Casagli et al 2007;Ripepe et al 2009;Aiuppa et al 2011;Inguaggiato et al 2011;Coppola et al 2012;Calvari et al 2014;Di Traglia et al 2014b). More significantly, evident differences were produced concerning the characteristics of the crater terrace inflation during the three periods of volcanic unrest.…”

Section: Discussionmentioning

confidence: 69%

“…Moreover, it does not provide a probabilistic reliability. At Stromboli, warning thresholds were proposed by Ripepe et al (2009), Inguaggiato et al (2011) and Di Traglia et al (2014b, based on observed recordings of geophysical/geochemical data. Coppola et al (2012) used Moderate Resolution Imaging Spectroradiometer (MODIS) data, classified using a rank ordered statistical plot.…”

Section: Discussionmentioning

confidence: 99%

“…On average, during the background activity, the explosions occur at a rate of \10 events/hour, shifting to a rate of [14 events/hour during unrests (measured by thermal cameras, Calvari et al 2014). This shift is commonly associated with changes in the features of the erupted products Houghton 2005, 2007;D'Oriano et al 2011) and in the parameters monitored by the geophysical (Casagli et al 2007;Ripepe et al 2009;Calvari et al 2014;Coppola et al 2012;Di Traglia et al 2014b) and geochemical monitoring network (Aiuppa et al 2009(Aiuppa et al , 2011Inguaggiato et al 2011). Modeling ground displacements collected at Stromboli by the GBInSAR from January 2010 to August 2014 revealed a deformation source at 482 ± 46 m a.s.l.…”

Section: Geological and Volcanological Backgroundmentioning

confidence: 96%

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A statistical-based approach for determining the intensity of unrest phases at Stromboli volcano (Southern Italy) using one-step-ahead forecasts of displacement time series

2016

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The evaluation of the intensity of unrest phases at active volcanoes is a crucial topic in volcano hazard studies. This is particularly troublesome in the case of persistently active volcanoes like Stromboli (Southern Italy), where intense eruptive summit activity (overflows, strong spattering, powerful explosions) has in some cases anticipated a flank eruption. In this context, a new approach for the analysis of displacement data is introduced. Daily displacements of the Stromboli crater terrace measured between January 1, 2010, and August 7, 2014, by a ground-based interferometric synthetic aperture radar system were compared, in retrospect, to displacement predictions provided by an autoregressive integrated moving average-based model. The methodology consisted in assessing when the actual displacements exceeded a fixed probability threshold for the forecasts (*95 %). Two sets of data were consequently produced: (1) series of residuals between actual displacements and model threshold (''anomalies'') and (2) series of normalized residuals between actual displacements and model threshold (''normalized anomalies''). This permitted to statistically identify and quantify the anomalous deformation at the crater terrace over the reference time interval of the analysis. Anomalies started to occur before each period of intense volcanic activity, highlighting the possibility to discern between background activity and unrest. Moreover, results indicated that the inflation of the crater terrace during the preparatory phase of the 2014 flank eruption was characterized by the greatest amount of anomalous deformation.

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“…On a monthly scale, in fact, the increase in strombolian activity is also evidenced by a drastic Ripepe et al, 2009). Very high radon activity persist until March 2 and then decrease to lower values whereas the signal of the infrasonic puffing was absent and seismic tremor dropped to very low values (Fig.…”

Section: Radon Mapping During Lava Effusions : 2002-3003 and 2007mentioning

confidence: 97%

Radon mapping, automatic measurements and extremely high 222Rn emissions during the 2002–2007 eruptive scenarios at Stromboli volcano

Cigolini

Laiolo

Ulivieri

et al. 2013

Journal of Volcanology and Geothermal Research

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The onset of the 2007 Stromboli effusive eruption recorded by an integrated geophysical network

Cited by 81 publications

References 16 publications

Inflation‐deflation cycles revealed by tilt and seismic records at Stromboli volcano

Inflation‐deflation cycles revealed by tilt and seismic records at Stromboli volcano

A statistical-based approach for determining the intensity of unrest phases at Stromboli volcano (Southern Italy) using one-step-ahead forecasts of displacement time series

Radon mapping, automatic measurements and extremely high 222Rn emissions during the 2002–2007 eruptive scenarios at Stromboli volcano

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