Correlations of volcanic ash texture with explosion earthquakes from vulcanian eruptions at Sakurajima volcano, Japan

Miwa, Takahiro; Toramaru, Atsushi; Iguchi, Masato

doi:10.1016/j.jvolgeores.2009.05.012

Cited by 53 publications

(41 citation statements)

References 34 publications

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“…Previous petrological monitoring studies of explosive eruption sequences have included a variety of techniques [11][12][13][14][15][16][17][18]. The studies have focused on tracking changes in interstitial glass composition of juvenile materials [12,14], calculation of diffusion timescales across compositional zones in crystals as indicators of magma recharge [11], determination of differences in crystal and bubble sizes and number densities as signs of change in magma supply rate [17][18][19], and characterization of melt inclusion compositions to better understand magma evolution and residence [15].…”

Section: Introductionmentioning

confidence: 99%

“…The styles of eruption and the locations of active craters have changed over time. Previous observations have reported daily and inter-event variations in the eruptive process of small events, Vulcanian, phreatic, and Strombolian styles have all been reported on the basis of petrological analyses of the volcanic ashes [12][13][14][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Petrological Monitoring of the AD 2011–2012 Volcanic Ash from Sakurajima Volcano, Southern Kyushu, Japan

2016

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Sakurajima in Japan is one of the world's most active volcanoes. This paper presents the results of a petrological study of the Showa Crater volcanic ash samples ejected from January 2011 to November 2012 from Sakurajima. The aim of this paper is to reconstruct the evolution in time of the conduit magma system, based on the compositions and physical properties of the studied volcanic ash. We analyzed the composition of interstitial glass and microcrystal of Black Volcanic Rock (BVR) and Black Vesicular Volcanic Rock (BVVR) in order to estimate the magma ascent rate. The results show that SiO 2 content of interstitial glass and crystallinity of the BVR is generally higher than for BVVR. The different types of juvenile material likely resulted from cooling-induced crystallization and decompression-induced crystallization in the conduit. The conditions of magma transit within the conduit from 2011 to 2012 differ: in 2011, the decompression rate and magma ascent rate of BVR were higher than for BVVR, but, in 2012, the decompression rate and magma ascent rate between BVR and BVVR were similar. As such, monitoring the petrological features of dated eruptive materials could provide useful information for evaluating ongoing eruptive activity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Petrological Monitoring of the AD 2011–2012 Volcanic Ash from Sakurajima Volcano, Southern Kyushu, Japan

2016

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“…The triggering context of the February 11 event is noteworthy. There is a well-established link between magma ascent rate and the occurrence of Vulcanian explosion (Miwa et al, 2009;Degruyter et al, 2012;Cassidy et al, 2015). Despite changes in extrusion rate in the days leading to it, the February 11 event seems to have been driven more by shallow processes than by deeper changes such as an increase of ascent rate and/or of chamber pressure (Stinton et al, 2014b;Cole et al, 2015).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Conduit processes during the February 11, 2010 Vulcanian eruption of Soufrière Hills, Montserrat

Burgisser

Bechon

Chevalier

et al. 2019

Journal of Volcanology and Geothermal Research

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We analyzed pumice from the February 11, 2010 Vulcanian explosion that immediately followed a large dome collapse at Soufrière Hills volcano. We obtained pre-explosive values of porosity, pressure, and depth by combining textural analyses and glass water content determinations. Our data suggest that the February 2010 explosion evacuated the upper 3 km of the conduit from the dense magma (≤10 vol.% porosity) it contained. The low porosity distribution in the volcanic conduit implies that the magma rising from the reservoir had time to extensively degas during emplacement. We use a conduit flow model to characterize the effects of permeability on ascent conditions. Model input parameters were fitted so as to match our pre-explosive porosity data, which yielded first-order constraints on conduit radius, mass flux, outgassing efficiency, and permeability. This parametric study suggests that efficient lateral gas escape is necessary to explain the low pre-explosive porosities. Steady-state solutions fitting the observed range of dome extrusion rate in the month preceding the February 11 event suggest permeabilities <10-13 m 2 deeper than 500 m, which are values typical of crack-supported permeability. Conversely, solutions with parameters consistent with bubble-supported permeability imply transient flow conditions prior to the February 11 event. The transient conditions imply that our data represent a snapshot of the porosity distribution within the conduit that does not preclude the temporary presence of much higher porosities in the conduit. Such unsteady conduit flow conditions are consistent with the irregular but active dome growth in the month prior to the February 11 event.

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“…Plots comparing storage depths, onset and unrest timescales to ascent time and rates for both explosive (black symbols) and effusive eruptions (red symbols). Ascent rates are from the compilation of Cassidy et al, (2018), depth estimates from Izu-Oshima, Japan (Hamada et al, 2014), Chaparrastique, El Salvador (Scarlato et al, 2017), Arenal, Cost Rica (Parat et al, 2014), Vesuvius, Italy (Scaillet et al, 2008), Mt Pelee (Martel et al, 1998), Soufriere Hills, Montserrat (Barclay et al, 1998), Colima, Mexico (Gordon Moore & Carmichael, 1998, Tungurahua, Ecuador (Andújar et al, 2017), Sakurajima, Japan (Miwa et al, 2009), Pinatubo, Philippines (Rutherford & Devine, 1996), Santiaguito, Guatemala (Scott et al, 2012), Santa Maria, Guatemala (Andrews, 2014), Unzen, Japan (Holtz et al, 2005), Mt. St. Helens (Rutherford & Devine, 1988), Chaiten, Chile (Castro & Dingwell, 2009), Taupo, New Zealand (Smith et al, 2005), Yellowstone, USA (Myers et al, 2016), Bishop Tuff, USA (Wallace et al, 1999).…”

Section: Figure Captionsmentioning

confidence: 99%

Explosive eruptions with little warning: Experimental petrology and geodetic observations from the 2014 eruption of Kelud, Indonesia

Cassidy¹,

Ebmeier²,

Helo³

et al. 2018

Preprint

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Explosive eruptions that occur with little or no precursory unrest pose the greatest hazards from volcanoes to nearby populations. Here we focus on the pre-eruptive conditions for these explosive events, their triggers and how these eruptions evolve. An example of such an event is the 2014 explosive eruption of Kelud volcano, where we have conducted a set of petrological experiments to understand pre-eruptive storage conditions for several recent eruptions. For the 2014 event, we combine this with an analysis of InSAR measured deformation. Our data suggest that both explosive and effusive eruptions at Kelud are sourced from a magma storage system at 2-3 km. However, explosive eruptions are fed by magma stored under relatively cool (~1000° C) and water-saturated conditions, whereas effusive eruptions are fed by slightly hotter (~1050° C), water-undersaturated magmas. We propose that the initial phase of the 2014 eruption was triggered by volatile overpressure, which then fostered a top-down decompression consistent with InSAR observations of co-eruptive subsidence at depths >2 km. By compiling a global dataset of monitoring signatures of explosive eruptions, we show that the onset of unrest rarely indicates shallow ascent of magma, as ascent mostly occurs in a matter of hours or minutes. We relate the timescale of pre-eruptive unrest to eruption triggering mechanisms, with yearly/decadal periods of unrest relating to magma injection events (which may or may not precede a magmatic eruption), whereas internal triggering (e.g. volatile overpressure) of an already present, cooling magma body leads to explosive eruptions with little warning.

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Correlations of volcanic ash texture with explosion earthquakes from vulcanian eruptions at Sakurajima volcano, Japan

Cited by 53 publications

References 34 publications

Petrological Monitoring of the AD 2011–2012 Volcanic Ash from Sakurajima Volcano, Southern Kyushu, Japan

Petrological Monitoring of the AD 2011–2012 Volcanic Ash from Sakurajima Volcano, Southern Kyushu, Japan

Conduit processes during the February 11, 2010 Vulcanian eruption of Soufrière Hills, Montserrat

Explosive eruptions with little warning: Experimental petrology and geodetic observations from the 2014 eruption of Kelud, Indonesia

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