Continuous thermal monitoring of the 2008 eruptions at Showa crater of Sakurajima volcano, Japan

Yokoo, Akihiko

doi:10.1186/bf03352987

Cited by 14 publications

(12 citation statements)

References 13 publications

(20 reference statements)

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“…Minamidake crater (1100 m above sea level) displayed Vulcanian activity with 8000 explosions in the period of 1955-2005. Showa crater, located 500 m east of the Minamidake, began to erupt in 2006 and has become the main active crater exhibiting vigorous eruptions (Yokoo, 2009;Aizawa et al, 2011). A temporary infrasound network ( Fig.…”

Section: Data Acquisitionmentioning

confidence: 99%

Local Volcano Infrasound and Source Localization Investigated by 3D Simulation

Kim¹,

Lees²

2014

Seismological Research Letters

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Section: Data Acquisitionmentioning

confidence: 99%

Local Volcano Infrasound and Source Localization Investigated by 3D Simulation

Kim¹,

Lees²

2014

Seismological Research Letters

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“…Video images of volcanic eruptions using a wide range of electromagnetic wavelengths are increasingly being recorded in the recent years [e.g., Formenti et al , 2003; Patrick , 2007a; Patrick et al , 2007; Yamamoto et al , 2008; Sahatapy‐Engel and Harris , 2009; Mori and Burton , 2009; Yokoo , 2009]. In addition, more realistic numerical simulations of volcanic plumes have become feasible [e.g., Suzuki et al , 2005; Ogden et al , 2008a, 2008b; Suzuki and Koyaguchi , 2009, 2010].…”

Section: Introductionmentioning

confidence: 99%

Experiments on a turbulent plume: Shape analyses

Kitamura¹,

Sumita²

2011

J. Geophys. Res.

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[1] We report the results of laboratory experiments on a turbulent plume, a simplified model of a positively buoyant volcanic plume with a small content of fine ash to study how the shape of the plume changes as a function of time. To model such plumes, we continuously inject a dense fluid downward at a constant exit velocity and study how the plume shape changes with time as vortices develop from flow instability and entrainment. Here a series of experiments are conducted with exit velocity and the density difference as the changeable parameters, and the jet-plume transition is realized in the laboratory. Initially the plume has a "finger-like" shape which becomes unstable and forms a "plume head" and later transforms into a "cone-like" self-similar shape. We also find that when the buoyancy becomes sufficiently large compared to inertia, there is a temporary deviation from the cone-like shape to form a "headed cone." We devise new methods to quantitatively characterize these changes of shape and define four regimes as a function of time. We find that the onset times of the flow instability and the regimes have negative power law dependence on the initial Re (or the exit velocity), and that buoyancy causes the regime transitions to become earlier. Our experiments suggest that monitoring the change of the shape of the rising volcanic plumes and analyzing the regime onset times, can be used as a measure to constrain their buoyancy.

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“…Monotonic infrasonic tremor has also been reported both with and without associated seismic tremor (e.g., Kilauea (Fee et al, 2010), Villarrica (Goto and Johnson, 2011;Ripepe et al, 2010), and Sakurajima (Sakai et al, 1996;Yokoo et al, 2008)). However, the switching between SHT and SAHT has only been reported at Reventador volcano, Ecuador (Lees et al, 2008), Arenal volcano, Costa Rica (Hagerty et al, 2000), and Fuego volcano, Guatemala (Lyons et al, 2013).…”

Section: Comparison With Other Casesmentioning

confidence: 99%

Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption

2013

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This paper reports a sequence of harmonic tremor observed during the 2011 eruption of Shinmoe-dake volcano, Kyushu, Japan. The main eruptive activity started with subplinian eruptions, followed by lava effusion. Harmonic tremor was observed as seismic waves during the final stage of the effusive eruption. The tremor observed at this stage had unclear and fluctuating harmonic modes. In the atmosphere, however, many impulsive acoustic waves indicating small surface explosions were observed. When effusion stopped and explosive degassing began, harmonic tremor was observed as acoustic waves in the air and in the seismic data, and the harmonic modes became clearer and more stable. This transition in the character of the harmonic tremor coincided with rapid deflation of the lava that had accumulated in the crater. Based on these observations, and laboratory experiments reproducing the features of the wave fields, it is concluded that the harmonic tremor sequence at Shinmoe-dake was generated by gas flowing through channels in the gradually solidifying lava. Comparing our results with the few cases of similar transition observed at other volcanoes, we expect that the transition indicates changes in magma rheology and degassing conditions in the crater, and therefore of changes in eruptive activity.

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Continuous thermal monitoring of the 2008 eruptions at Showa crater of Sakurajima volcano, Japan

Cited by 14 publications

References 13 publications

Local Volcano Infrasound and Source Localization Investigated by 3D Simulation

Local Volcano Infrasound and Source Localization Investigated by 3D Simulation

Experiments on a turbulent plume: Shape analyses

Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption

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