Results 161 to 170 of about 331 (178)
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Journal of Volcanology and Geothermal Research, 2016
Abstract We examine the initial phases of explosion earthquakes accompanying Vulcanian eruptions at Lokon-Empung volcano in Indonesia to reveal the triggering process of explosive eruptions. In 2012–2013, 56 Vulcanian eruptions at Lokon-Empung were observed by our temporary observation network being comprised of four broadband seismometers and two ...
Taishi Yamada +8 more
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Abstract We examine the initial phases of explosion earthquakes accompanying Vulcanian eruptions at Lokon-Empung volcano in Indonesia to reveal the triggering process of explosive eruptions. In 2012–2013, 56 Vulcanian eruptions at Lokon-Empung were observed by our temporary observation network being comprised of four broadband seismometers and two ...
Taishi Yamada +8 more
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Earth and Planetary Science Letters, 2011
Abstract The dynamics of magma fragmentation is a controlling factor in the behavior of explosive volcanic eruptions. If porous magma is sufficiently decompressed, a fragmentation front develops and travels through the magma at a certain speed (fragmentation speed) while the resulting particles are being ejected.
Miguel A. Alatorre-Ibargüengoitia +2 more
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Abstract The dynamics of magma fragmentation is a controlling factor in the behavior of explosive volcanic eruptions. If porous magma is sufficiently decompressed, a fragmentation front develops and travels through the magma at a certain speed (fragmentation speed) while the resulting particles are being ejected.
Miguel A. Alatorre-Ibargüengoitia +2 more
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2018
Astract: Vulcanian eruptions are frequent, small-scale, short-lived explosive volcanic eruptions, which are thought to be produced by impulsive sources. The experiments presented here, produced byinjectionsofmixturesofwater,alcoholorsaltandsolidparticlesintofreshwater,createdawide variety of turbulent flows from steady and impulsive sources.
Clarke, AB, Phillips, JC, Chojnicki, KN
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Astract: Vulcanian eruptions are frequent, small-scale, short-lived explosive volcanic eruptions, which are thought to be produced by impulsive sources. The experiments presented here, produced byinjectionsofmixturesofwater,alcoholorsaltandsolidparticlesintofreshwater,createdawide variety of turbulent flows from steady and impulsive sources.
Clarke, AB, Phillips, JC, Chojnicki, KN
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Analysis of infrasonic and seismic events related to the 1998 Vulcanian eruption at Sakurajima
Journal of Volcanology and Geothermal Research, 2008Abstract We present results from a detailed analysis of seismic and infrasonic data recorded over a four day period prior to the Vulcanian eruptive event at Sakurajima volcano on May 19, 1998. Nearly one hundred seismic and infrasonic events were recorded on at least one of the nine seismic–infrasonic stations located within 3 km of the crater.
M. Morrissey +3 more
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Journal of Volcanology and Geothermal Research, 2009
Abstract We compare the texture of volcanic ash with the maximum amplitude of explosion earthquakes ( A eq ) for vulcanian eruptions from Sakurajima volcano. We analyze the volcanic ash emitted by 17 vulcanian eruptions from 1974 to 1987. Using a stereoscopic microscope, we classify the glassy particles into smooth surface particles (S-type ...
T. Miwa, A. Toramaru, M. Iguchi
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Abstract We compare the texture of volcanic ash with the maximum amplitude of explosion earthquakes ( A eq ) for vulcanian eruptions from Sakurajima volcano. We analyze the volcanic ash emitted by 17 vulcanian eruptions from 1974 to 1987. Using a stereoscopic microscope, we classify the glassy particles into smooth surface particles (S-type ...
T. Miwa, A. Toramaru, M. Iguchi
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Journal of Volcanology and Geothermal Research, 2013
Abstract We discuss the process of vulcanian eruptions on the basis of temporal variation of the texture of andesitic volcanic ash ejected from the Sakurajima volcano, Japan. Falling ash samples were collected every 2–50 min for petrological analysis.
Takahiro Miwa +2 more
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Abstract We discuss the process of vulcanian eruptions on the basis of temporal variation of the texture of andesitic volcanic ash ejected from the Sakurajima volcano, Japan. Falling ash samples were collected every 2–50 min for petrological analysis.
Takahiro Miwa +2 more
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Pure and Applied Geophysics, 2015
Colima Volcano (19.512°N, 103.617°W, 4000 m.a.s.l.), located on the border between the states of Jalisco and Colima in western Mexico, is the most active volcano in the country. Its activity has taken place through diverse styles of eruption, from very explosive to effusive.
Francisco Javier Núñez-Cornú +3 more
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Colima Volcano (19.512°N, 103.617°W, 4000 m.a.s.l.), located on the border between the states of Jalisco and Colima in western Mexico, is the most active volcano in the country. Its activity has taken place through diverse styles of eruption, from very explosive to effusive.
Francisco Javier Núñez-Cornú +3 more
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Seismological Research Letters, 2014
The study of volcano infrasound is becoming increasingly popular (Johnson and Ripepe, 2011; Fee and Matoza, 2013) with analysis of the recorded signals contributing to our understanding of eruption dynamics and enhancing capabilities in remote monitoring of volcanoes. Multiple studies have determined the source locations of the infrasound from volcanic
A. Yokoo, Y. J. Suzuki, M. Iguchi
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The study of volcano infrasound is becoming increasingly popular (Johnson and Ripepe, 2011; Fee and Matoza, 2013) with analysis of the recorded signals contributing to our understanding of eruption dynamics and enhancing capabilities in remote monitoring of volcanoes. Multiple studies have determined the source locations of the infrasound from volcanic
A. Yokoo, Y. J. Suzuki, M. Iguchi
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Journal of Volcanology and Geothermal Research, 2012
Abstract Decompression rate of magma at fragmentation (immediately before or after fragmentation) was determined using broken crystals found in the pumices ejected during the vulcanian explosion of Sakurajima volcano, Japan. The combined analysis of textural data obtained from the natural pumice samples and a simple model for the crystal fracturing ...
Takahiro Miwa, Nobuo Geshi
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Abstract Decompression rate of magma at fragmentation (immediately before or after fragmentation) was determined using broken crystals found in the pumices ejected during the vulcanian explosion of Sakurajima volcano, Japan. The combined analysis of textural data obtained from the natural pumice samples and a simple model for the crystal fracturing ...
Takahiro Miwa, Nobuo Geshi
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Bulletin of Volcanology, 2017
The study of ~1300 juvenile and lithic blocks from a Vulcanian phase of the 1912 eruption of Novarupta provides new insight into the state of the magma as an eruption passes from sustained Plinian to dome growth. Blocks that were predominantly ballistically ejected were measured and sampled within an ~2–3-km radius from vent and supply a picture of a ...
Isgett, S. +5 more
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The study of ~1300 juvenile and lithic blocks from a Vulcanian phase of the 1912 eruption of Novarupta provides new insight into the state of the magma as an eruption passes from sustained Plinian to dome growth. Blocks that were predominantly ballistically ejected were measured and sampled within an ~2–3-km radius from vent and supply a picture of a ...
Isgett, S. +5 more
openaire +3 more sources