Highlights from a seismic broadband array on Stromboli Volcano

Neuberg, J.; Luckett, Richard; Ripepe, Maurizio; Braun, T.

doi:10.1029/94gl00377

Cited by 177 publications

(98 citation statements)

References 6 publications

(2 reference statements)

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“…We numerically extract explosions based on when seismic amplitude exceeds twice the monthly root-mean-square amplitude. As presented in many previous papers (e.g., Neuberg et al 1994;Ripepe et al 2001;Chouet et al 2003), very long-period seismic signals (about 10 s) are accompanied by explosions. Since each explosion accompanies very long-period and/or high-frequency (4-7 Hz) seismic waves (Ripepe et al 2001), we examine maximum peak amplitudes at 0.05-0.2 and 1-8 Hz.…”

Section: Strombolian Eruptions At Stromboli Volcano Italymentioning

confidence: 88%

Magnitude–frequency distribution of volcanic explosion earthquakes

Nishimura

Iguchi

Hendrasto³

et al. 2016

Earth Planet Sp

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Magnitude-frequency distributions of volcanic explosion earthquakes that are associated with occurrences of vulcanian and strombolian eruptions, or gas burst activity, are examined at six active volcanoes. The magnitude-frequency distribution at Suwanosejima volcano, Japan, shows a power-law distribution, which implies self-similarity in the system, as is often observed in statistical characteristics of tectonic and volcanic earthquakes. On the other hand, the magnitude-frequency distributions at five other volcanoes, Sakurajima and Tokachi-dake in Japan, Semeru and Lokon in Indonesia, and Stromboli in Italy, are well explained by exponential distributions. The statistical features are considered to reflect source size, as characterized by a volcanic conduit or chamber. Earthquake generation processes associated with vulcanian, strombolian and gas burst events are different from those of eruptions ejecting large amounts of pyroclasts, since the magnitude-frequency distribution of the volcanic explosivity index is generally explained by the power law.

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Section: Strombolian Eruptions At Stromboli Volcano Italymentioning

confidence: 88%

Magnitude–frequency distribution of volcanic explosion earthquakes

Nishimura

Iguchi

Hendrasto³

et al. 2016

Earth Planet Sp

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“…elastostatic deformations observed in conjunction with explosions at many diverse open-vent volcanoes, e. g., Stromboli (Italy) or Erebus (Antarctica), and are thought to be associated with volumetric changes internal to the volcano edifice [Neuberg et al, 1994;Rowe et al, 1998]. Principle component VLP particle motions may point to the locus of volume change, so long as care is taken to account for oblique incidence of seismic waves at the free surface [Neuberg and Pointer, 2000].…”

Section: 1002/2014gl061310mentioning

confidence: 99%

Explosive dome eruptions modulated by periodic gas‐driven inflation

Johnson

Lyons

Andrews

et al. 2014

Geophysical Research Letters

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Volcan Santiaguito (Guatemala) "breathes" with extraordinary regularity as the edifice's conduit system accumulates free gas, which periodically vents to the atmosphere. Periodic pressurization controls explosion timing, which nearly always occurs at peak inflation, as detected with tiltmeters. Tilt cycles in January 2012 reveal regular 26 ± 6 min inflation/deflation cycles corresponding to at least~10 1 kg/s of gas fluxing the system. Very long period (VLP) earthquakes presage explosions and occur during cycles when inflation rates are most rapid. VLPs locate~300 m below the vent and indicate mobilization of volatiles, which ascend at~50 m/s. Rapid gas ascent feeds pyroclast-laden eruptions lasting several minutes and rising tõ 1 km. VLPs are not observed during less rapid inflation episodes; instead, gas vents passively through the conduit producing no infrasound and no explosion. These observations intimate that steady gas exsolution and accumulation in shallow reservoirs may drive inflation cycles at open-vent silicic volcanoes.

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“…To see how this is the case, one needs to consider the situation represented in Figure 16c [Neuberg et al, 1994]. The impulsive jet recoil, however, produces short-period P, S V, and Rayleigh waves, which generate radially directed ground motion in the near field (horizontal radial pulse in Figure 14b) and far field (radial particle motion 13-18 s in the record in Figure 13a) It may be difficult to explain the spectra in Figures 4-6 solely through the expedient of a regular sequence of bubble bursts/ collapses.…”

Section: Implications For Source Dynamicsmentioning

confidence: 99%

Source and path effects in the wave fields of tremor and explosions at Stromboli Volcano, Italy

Chouet¹,

Saccorotti²,

Martini³

et al. 1997

J. Geophys. Res.

186

135

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Abstract. The wave fields generated by Strombolian activity are investigated using data from small-aperture seismic arrays deployed on the north flank of Stromboli and data from seismic and pressure transducers set up near the summit crater. Measurements of slowness and azimuth as a function of time clearly indicate that the sources of tremor and explosions are located beneath the summit crater at depths shallower than 200 rn with occasional bursts of energy originating from sources extending to a depth of 3 km. Slowness, azimuth, and particle motion measurements reveal a complex composition of body and surface waves associated with topography, structure, and source properties. Body waves originating at depths shallower than 200 rn dominate the wave field at frequencies of 0.5-2.5 Hz, and surface waves generated by the surficial part of the source and by scattering sources distributed around the island dominate at frequencies above 2.5 Hz. The records of tremor and explosions are both dominated by SH motion. Far-field records from explosions start with radial motion, and near-field records from those events show dominantly horizontal motion and often start with a low-frequency (1-2 Hz) precursor characterized by elliptical particle motion, followed within a few seconds by a highfrequency radial phase (1-10 Hz) accompanying the eruption of pyroclastics. The dominant component of the near-and far-field particle motions from explosions, and the timing of air and body wave phases observed in the near field, are consistent with a gaspiston mechanism operating on a shallow (<200 rn deep), vertical crack-like conduit. Models of a degassing fluid column suggest that noise emissions originating in the collective oscillations of bubbles ascending in the magma conduit may provide an adequate self-excitation mechanism for sustained tremor generation at Stromboli.

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Highlights from a seismic broadband array on Stromboli Volcano

Cited by 177 publications

References 6 publications

Magnitude–frequency distribution of volcanic explosion earthquakes

Magnitude–frequency distribution of volcanic explosion earthquakes

Explosive dome eruptions modulated by periodic gas‐driven inflation

Source and path effects in the wave fields of tremor and explosions at Stromboli Volcano, Italy

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