Thermal, seismic and infrasound observations of persistent explosive activity and conduit dynamics at Santiaguito lava dome, Guatemala

Sahetapy-Engel, Steve T.; Harris, Andrew; Marchetti, E.

doi:10.1016/j.jvolgeores.2007.11.026

Cited by 57 publications

(65 citation statements)

References 34 publications

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“…4), the stacked signals reveal the following common characteristics of the thermal waveforms, regardless of the individual temperatures; such as a rapid increase in temperature toward the peak value in the first 2-5 s, which is followed by a more gradual decrease over a few minutes, like the thermal waveforms observed at Santiaguito volcano (Sahetapy-Engel et al, 2008).…”

Section: Thermal Datamentioning

confidence: 76%

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

Yokoo

2009

Earth Planet Sp

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An infrared thermal monitoring system installed 3.5 km from the Showa crater of Sakurajima volcano, Japan, enabled the capture of continuous thermal waveform data at 1 Hz during two recent episodes of eruptive activity. The eruptions were characterized by a sudden increase in volcanic cloud temperature in the first 2-5 s, followed by gradual cooling over a few minutes. The maximum cloud temperature varied widely between individual events with a range of more than 180• C. A positive relation between the maximum temperature and the exit velocity of the cloud has also been established. At higher temperatures and faster exit velocities of the volcanic cloud, the eruptions tend to be accompanied by pyroclastic density currents. However, no strong correlation was observed in a 6-month period of 2008 between temporal changes in surface manifestation of eruptive activity and the change of cloud temperatures. Identification of factors that control such observed apparent temperatures of volcanic cloud would lead to a better understanding of the thermodynamics of the eruption itself.

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Section: Thermal Datamentioning

confidence: 76%

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

Yokoo

2009

Earth Planet Sp

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“…During 2003, its activity was characterised by weak Vulcanian explosions associated with low but continuous degassing with magma eruption rates up to 2-3 kg s −1 (Harris et al, 2003). In this study, 84 explosions with repose intervals ranging from 110 s to about 2 hrs were extracted from the coupled records of a thermal-acoustic-seismic array deployed in January 2003 by Sahetapy-Engel et al (2008), who described the explosions as thermal emissions related to shear-induced fragmentation due to a stick-slip flow regime. These emissions had durations of 1 to 8 min and repose periods of 1 to 56 min.…”

Section: Santiaguito Guatemala (Stg)mentioning

confidence: 99%

“…Data acquisition uncertainty considered as the absolute error. References: (1) Hill et al (1998), (2) INGV (2012), (3) Ripepe et al (2013), (4) Sahetapy-Engel et al (2008), (5) Iguchi (2013), (6) Druitt et al (2002), (7) Ruiz et al (2005), (8) Varley et al (2006), (9) Webb et al (2014), (10) Watt et al (2007), (11) Dirksen et al (2006), (12) Valade et al (2012), (13) Ripepe et al (2008 Unfortunately, this complexity is not encompassed by current classification schemes as they are mostly based on deposit properties, e.g. tephra dispersal, grainsize and/or erupted volume, with the assumption of steady-state conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…MacDonald, 1972;Walker, 1973;Pyle, 1989). Pulsatory volcanic activity has been also studied in terms of fluid and source dynamics at specific volcanoes (Mason et al, 2006;Sahetapy-Engel et al, 2008;Marchetti et al, 2009;Gonnermann and Manga, 2012;Moitra et al, 2013). In the context of these studies, it is important to quantify unsteadiness and relate it to traditional eruptive styles.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying unsteadiness and dynamics of pulsatory volcanic activity

Domínguez

Pioli

Bonadonna

et al. 2016

Earth and Planetary Science Letters

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Available online xxxx Editor: T.A. MatherKeywords: explosions pulsatory activity magma viscosity repose interval source dynamics eruptive style Pulsatory eruptions are marked by a sequence of explosions which can be separated by time intervals ranging from a few seconds to several hours. The quantification of the periodicities associated with these eruptions is essential not only for the comprehension of the mechanisms controlling explosivity, but also for classification purposes. We focus on the dynamics of pulsatory activity and quantify unsteadiness based on the distribution of the repose time intervals between single explosive events in relation to magma properties and eruptive styles. A broad range of pulsatory eruption styles are considered, including Strombolian, violent Strombolian and Vulcanian explosions. We find a general relationship between the median of the observed repose times in eruptive sequences and the viscosity of magma given by η ≈ 100 · t median . This relationship applies to the complete range of magma viscosities considered in our study (10 2 to 10 9 Pa s) regardless of the eruption length, eruptive style and associated plume heights, suggesting that viscosity is the main magma property controlling eruption periodicity. Furthermore, the analysis of the explosive sequences in terms of failure time through statistical survival analysis provides further information: dynamics of pulsatory activity can be successfully described in terms of frequency and regularity of the explosions, quantified based on the log-logistic distribution.A linear relationship is identified between the log-logistic parameters, μ and s. This relationship is useful for quantifying differences among eruptive styles from very frequent and regular mafic events (Strombolian activity) to more sporadic and irregular Vulcanian explosions in silicic systems. The time scale controlled by the parameter μ, as a function of the median of the distribution, can be therefore correlated with the viscosity of magmas; while the complexity of the erupting system, including magma rise rate, degassing and fragmentation efficiency, can be also described based on the log-logistic parameter s, which is found to increase from regular mafic systems to highly variable silicic systems. These results suggest that the periodicity of explosions, quantified in terms of the distribution of repose times, can give fundamental information about the system dynamics and change regularly across eruptive styles (i.e., Strombolian to Vulcanian), allowing for direct comparison and quantification of different types of pulsatory activity during these eruptions.

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“…However, eruptive products represent time-integrated end results of the fragmentation, ejection, and dispersal processes, and the idealized terms do not adequately capture the observed diversity in explosion styles. Infrasound data, which represent a geophysical recording of the explosion process, show promise for better characterizing, quantifying, and classifying the many varied mechanisms and styles of explosive eruptions (e.g., Johnson, 2007;Sahetapy-Engel et al, 2008;Marchetti et al, 2009;Lopez et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Acoustic Characterization of Explosion Complexity at Sakurajima, Karymsky, and Tungurahua Volcanoes

Matoza

Fee

Lopez

2014

Seismological Research Letters

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Thermal, seismic and infrasound observations of persistent explosive activity and conduit dynamics at Santiaguito lava dome, Guatemala

Cited by 57 publications

References 34 publications

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

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

Quantifying unsteadiness and dynamics of pulsatory volcanic activity

Acoustic Characterization of Explosion Complexity at Sakurajima, Karymsky, and Tungurahua Volcanoes

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