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

Genco, Riccardo; Ripepe, Maurizio

doi:10.1029/2010gl042925

Cited by 73 publications

(110 citation statements)

References 14 publications

(26 reference statements)

Supporting

Mentioning

105

Contrasting

Order By: Relevance

“…4) could be linked to volumetric changes in the conduit before and after an explosion. These changes occurred in the timescale of hundreds of seconds, which is comparable to the timescale of pre-explosion conduit pressurization recorded by ground motion (Genco and Ripepe 2010), and is also compatible with time scales of bubble rise and growth in a basaltic magma (Nishimura 2009). The accelerating trend of inflation of the debris that we observed in the seconds before an explosion also matched the surface motion of a liquid column hosting a rising, pressurized gas slug (James et al 2008(James et al , 2009.…”

Section: Effect Of the Covermentioning

confidence: 56%

Recycled ejecta modulating Strombolian explosions

et al. 2016

View full text Add to dashboard Cite

Two main end-members of eruptive regimes are identified from analyses of high-speed videos collected at Stromboli volcano (Italy), based on vent conditions: one where the vent is completely clogged by debris, and a second where the vent is open, without any cover. By detailing the vent processes for each regime, we provide the first account of how the presence of a cover affects eruptive dynamics compared to open-vent explosions. For clogged vents, explosion dynamics are controlled by the amount and grain size of the debris. Fine-grained covers are entirely removed by explosions, favouring the generation of fine ash plumes, while coarse-grained covers are only partially removed by the explosions, involving minor amounts of ash. In both fine-and coarse-grained cases, in-vent ground deformation of the debris reflect variations in the volumetric expansion of gas in the conduit, with rates of change of the deformation comparable to ground inflation related to pre-burst conduit pressurization. Eruptions involve the ejection of relatively slow and cold bombs and lapilli, and debris is observed to both fall back into the vent after each explosion and to gravitationally accumulate between explosions by rolling down the inner crater flanks to produce the cover itself. Part of this material may also contribute to the formation of a more degassed, crystallized and viscous magma layer at the top of the conduit. Conversely, open-vent explosions erupt with hotter pyroclasts, with higher exit velocity and with minor or no ash phase involved.

show abstract

Section: Effect Of the Covermentioning

confidence: 56%

Recycled ejecta modulating Strombolian explosions

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Using this value, the apparent displacement of the seismogram due to tilting motion can be transferred to the angle of tilt change in the frequency range of ω < < ω 0 , where ω 0 is the natural angular frequency of the seismometer. The same relationship between the seismometer displacement and tilt change was also reported by Genco and Ripepe (2010), in which this relationship was applied to extract the tilt motion due to precursory inflation of a Strombolian eruption from the CMG-40T seismogram. Takeo et al (2013) also applied this method to obtain tilt motion prior to Vulcanian eruptions at Shinmoe-dake volcano in 2011.…”

Section: Estimation Of Tilt Motion From Seismogram Datamentioning

confidence: 90%

Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008

Aoyama

Oshima

2015

Earth Planet Sp

View full text Add to dashboard Cite

Although forecasting an occurrence of phreatic eruption is very difficult, it has been reported that some precursory activities often precede these eruptions at several volcanoes. In this study, we observed seismic activities before and during the 2008 phreatic eruption at Meakan-dake volcano, eastern Hokkaido, Japan, by using broadband seismometers and surface mount-type tiltmeters. The precursory increase in seismicity began in late September about 2 months before the first eruption on November 18. After several rises and falls in seismicity in October and in early November, a small volcanic tremor was observed early on November 16. Although the original velocity seismogram of the tremor generally appeared to be spindle shaped, an outstanding ramp function appeared in the displacement seismogram obtained by simple integration. Since the ramp function appeared only in the horizontal components and continued for about 3 min, which is sufficiently longer than the natural period of the seismometer, we regarded the ramp function as an expression of the tilting motions of seismic stations that was quantitatively confirmed by the strong similarity between horizontal displacement seismograms and tilt data from co-located biaxial tiltmeter. Azimuthal distribution of three tilting vectors obtained from broadband seismograms was not consistent with a simple spherical source but rather strongly suggested a vertical dike under the crater. In this study, we confirmed that an almost vertical single dike effectively explains the observed tilting vectors. The estimated volume increase in the dike was 4-5 × 10 4 m 3 . The strike direction of the dike is highly consistent with the alignment of the hydrothermal area on and around the volcano. Our dike model also partially explains the changes in global navigation satellite system (GNSS) measurement and in groundwater levels reported in previous research. Since a similar deformation coincided with a volcanic tremor preceding the 2006 eruption, we interpret that this must be an important preparatory process of phreatic eruptions at Meakan-dake volcano.

show abstract

“…That eruption of such a magma volume could be enough to destabilize the LP magma likely reflects the volume of HP magma stored above the LP source region ( [Bertagnini et al, 2003], [Francalanci et al, 2005] and [Métrich et al, 2005]). Applying the model for Stromboli's conduit of (Bonaccorso and Davis, 1999) and (Genco and Ripepe, 2010) estimated a conduit radius of 5 m by modelling of the tilt recorded during the volcano ordinary Strombolian activity. However, considering the model of Burton et al (2009) for magma circulation and HP magma recycling within the volcano conduit during effusive phases, conduit effective diameter can vary, i.e.…”

Section: Discussionmentioning

confidence: 99%

Lava effusion — A slow fuse for paroxysms at Stromboli volcano?

Calvari

Spampinato

Bonaccorso

et al. 2011

Earth and Planetary Science Letters

View full text Add to dashboard Cite

The 2007 effusive eruption of Stromboli followed a similar pattern to the previous 2002-2003 episode. In both cases, magma ascent led to breaching of the uppermost part of the conduit forming an eruptive fissure that discharged lava down the Sciara del Fuoco depression. Both eruptions also displayed a 'paroxysmal' explosive event during lava flow output. From daily effusion rate measurements retrieved from helicopter-and satellite-based infrared imaging, we deduce that the cumulative volume of lava erupted before each of the two paroxysms was similar. Based on this finding, we propose a conceptual model to explain why both paroxysms occurred after this 'threshold' cumulative volume of magma was erupted. The gradual decompression of the deep plumbing system induced by magma withdrawal and eruption, drew deeper volatile-rich magma into the conduit, leading to the paroxysms. The proposed model might provide a basis for forecasting paroxysmal explosions during future effusive eruptions of Stromboli.

show abstract

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

Cited by 73 publications

References 14 publications

Recycled ejecta modulating Strombolian explosions

Recycled ejecta modulating Strombolian explosions

Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008

Lava effusion — A slow fuse for paroxysms at Stromboli volcano?

Contact Info

Product

Resources

About