Dynamics of surges generated by hydrothermal blasts during the 6 August 2012 Te Maari eruption, Mt. Tongariro, New Zealand

Lube, Gert; Bréard, E.; Cronin, Shane J.; Procter, Jonathan; Brenna, Marco; Moebis, Anja; Pardo, Natalia; Stewart, Robert B.; Jolly, Arthur D.; Fournier, N.

doi:10.1016/j.jvolgeores.2014.05.010

Cited by 73 publications

(50 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Eruption directivity, where the energy and mass may be preferentially discharged from the conduit, has important hazardous consequences prompting public interest and research. Several examples of such directivity effects have been documented from visual (Lube et al, ), seismic (Kanamori & Given, ), infrasound (Jolly et al, ; McKee et al, ; Rowell et al, ), and GPS observations (Fournier & Jolly, ). Observed features of infrasonic records include seismoacoustic energy coupling and wave conversion (e.g., Johnson & Aster ; Ichihara et al, ), excitations from secondary source features such as jet turbulence (e.g., Matoza et al, ; Rowell et al, ), or distorted frequencies that may be ascribed to Doppler effects (Jolly et al, ).…”

Section: Introductionmentioning

confidence: 98%

“…Observed features of infrasonic records include seismoacoustic energy coupling and wave conversion (e.g., Johnson & Aster ; Ichihara et al, ), excitations from secondary source features such as jet turbulence (e.g., Matoza et al, ; Rowell et al, ), or distorted frequencies that may be ascribed to Doppler effects (Jolly et al, ). Eruption directivity effects may be associated with hazardous surge events (Lube et al, ), ballistics impact on infrastructure (Fitzgerald et al, ; Tsunematsu et al ), and lateral blasts (Kanamori & Given, ; Kieffer, ); hence, the rapid recognition of such events from real‐time seismoacoustic systems may someday improve response capabilities for emergency managers. Seismoacoustic records from the wide range of eruptive phenomena suffer, however, from the inherent ambiguity associated with trying to separate source directivity effects from distortions associated with path and site effects.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Capturing the Acoustic Radiation Pattern of Strombolian Eruptions using Infrasound Sensors Aboard a Tethered Aerostat, Yasur Volcano, Vanuatu

Jolly

Matoza

Fee

et al. 2017

Geophysical Research Letters

View full text Add to dashboard Cite

We obtained an unprecedented view of the acoustic radiation from persistent strombolian volcanic explosions at Yasur volcano, Vanuatu, from the deployment of infrasound sensors attached to a tethered aerostat. While traditional ground‐based infrasound arrays may sample only a small portion of the eruption pressure wavefield, we were able to densely sample angular ranges of ~200° in azimuth and ~50° in takeoff angle by placing the aerostat at 38 tethered loiter positions around the active vent. The airborne data joined contemporaneously collected ground‐based infrasound and video recordings over the period 29 July to 1 August 2016. We observe a persistent variation in the acoustic radiation pattern with average eastward directed root‐mean‐square pressures more than 2 times larger than in other directions. The observed radiation pattern may be related to both path effects from the crater walls, and source directionality.

show abstract

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Capturing the Acoustic Radiation Pattern of Strombolian Eruptions using Infrasound Sensors Aboard a Tethered Aerostat, Yasur Volcano, Vanuatu

Jolly

Matoza

Fee

et al. 2017

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…They include dust storms (e.g., Goudie & Middleton, 2001), powder snow avalanches (e.g., Carroll et al, 2013), and volcanic biphasic suspensions such as conduit flows, buoyant plumes, or pyroclastic density currents (e.g., Bonadonna et al, 2011;Carazzo & Jellinek, 2012;Dufek, 2016;Gonnermann & Manga, 2007). % (Andrews, 2014;Cantero et al, 2012;Lube et al, 2014). The concentration is thought to be typically less than~1 vol.…”

Section: Introductionmentioning

confidence: 99%

Maximum Solid Phase Concentration in Geophysical Turbulent Gas‐Particle Flows: Insights From Laboratory Experiments

Weit

Roche

Dubois

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

The maximum solid phase concentration in geophysical turbulent gas‐particle mixtures is essential for understanding the flow dynamics but is poorly known. We present laboratory experiments on turbulent mixtures of air and ceramic particles generated in a vertical pipe. The mixtures had maximum bulk concentrations Cmax = 0.7–2.4 vol. % set by the onset of clustering and that increased with the degree of turbulence. Comparison with results of similar experiments with less dense (glass) particles reveals that Cmax increases with the particle Reynolds number according to Cmax = 0.78 × Rep0.17. Published results of experiments at specific Rep in different configurations are consistent with our data, suggesting that the model for Cmax may be generally applicable to turbulent mixtures. From our empirical laws we infer that natural turbulent gas‐particle flows with Rep ~ 102–105 have maximum solid concentrations of ~2–5 vol. %.

show abstract

“…Reconstruction of phreatic events based on geological and witness records is important to understand the nature of these eruptions and to evaluate potential hazards related to phreatic eruptions. However, such studies are limited to relatively large-scale past phreatic events (e.g., Bandai volcano, Yamamoto et al 1999;Adatara volcano, Fujinawa et al 2008) and recent well-observed eruptions (e.g., Heiken et al 1980;Ohba et al 2007;Lube et al 2014), and there are still uncertainties on quantitative estimation of the eruption processes based on geological records. The eruption at Ontake volcano provides an opportunity to study the process of a phreatic eruption.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of a phreatic eruption on 27 September 2014 at Ontake volcano, central Japan, based on proximal pyroclastic density current and fallout deposits

et al. 2016

View full text Add to dashboard Cite

The phreatic eruption at Ontake volcano on 27 September 2014, which caused the worst volcanic disaster in the past half-century in Japan, was reconstructed based on observations of the proximal pyroclastic density current (PDC) and fallout deposits. Witness observations were also used to clarify the eruption process. The deposits are divided into three major depositional units (Units A, B, and C) which are characterized by massive, extremely poorly sorted, and multimodal grain-size distribution with 30-50 wt% of fine ash (silt-clay component). The depositional condition was initially dry but eventually changed to wet. Unit A originated from gravity-driven turbulent PDCs in the relatively dry, vent-opening phase. Unit B was then produced mainly by fallout from a vigorous moist plume during vent development. Unit C was derived from wet ash fall in the declining stage. Ballistic ejecta continuously occurred during vent opening and development. As observed in the finest population of the grain-size distribution, aggregate particles were formed throughout the eruption, and the effect of water in the plume on the aggregation increased with time and distance. Based on the deposit thickness, duration, and grain-size data, and by applying a scaling analysis using a depth-averaged model of turbulent gravity currents, the particle concentration and initial flow speed of the PDC at the summit area were estimated as 2 × 10 −4-2 × 10 −3 and 24-28 m/s, respectively. The tephra thinning trend in the proximal area shows a steeper slope than in similar-sized magmatic eruptions, indicating a large tephra volume deposited over a short distance owing to the wet dispersal conditions. The Ontake eruption provided an opportunity to examine the deposits from a phreatic eruption with a complex eruption sequence that reflects the effect of external water on the eruption dynamics.

show abstract

Dynamics of surges generated by hydrothermal blasts during the 6 August 2012 Te Maari eruption, Mt. Tongariro, New Zealand

Cited by 73 publications

References 41 publications

Capturing the Acoustic Radiation Pattern of Strombolian Eruptions using Infrasound Sensors Aboard a Tethered Aerostat, Yasur Volcano, Vanuatu

Capturing the Acoustic Radiation Pattern of Strombolian Eruptions using Infrasound Sensors Aboard a Tethered Aerostat, Yasur Volcano, Vanuatu

Maximum Solid Phase Concentration in Geophysical Turbulent Gas‐Particle Flows: Insights From Laboratory Experiments

Reconstruction of a phreatic eruption on 27 September 2014 at Ontake volcano, central Japan, based on proximal pyroclastic density current and fallout deposits

Contact Info

Product

Resources

About