Eruptive sequence and seismic activity of Llaima volcano (Chile) during the 2007–2009 eruptive period: Inferences of the magmatic feeding system

Franco, Luis; Palma, José Luis; Lara, Luis E.; Gil-Cruz, Fernando; Cardona, Carlos; Basualto, Daniel; Martín, Juan San

doi:10.1016/j.jvolgeores.2019.04.014

Cited by 17 publications

(17 citation statements)

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“…This type of thermal precursor may occur in basaltic and basaltic-andesitic volcanoes characterized by the reactivation of the central vent after a period of quiescence. The unrest phase is typically characterized by an evident increase in thermal anomalies inside the summit crater, corresponding to the opening of the system, followed by the ascent of the magmatic column and by increasing explosive activity (Franco et al, 2019), that culminates with a paroxysmal phase (Figure 7c). The explosive activity is followed by a further intensification of the effusive activity with the consequent emission of lava flows along the flanks of the volcano (Global Volcanism Program, 2008;Bouvet de Maisonneuve et al, 2012).…”

Section: Llaima Chile (Rise Of Magmatic Column -Figure 7c)mentioning

confidence: 99%

Thermal Remote Sensing for Global Volcano Monitoring: Experiences From the MIROVA System

et al. 2020

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Section: Llaima Chile (Rise Of Magmatic Column -Figure 7c)mentioning

confidence: 99%

Thermal Remote Sensing for Global Volcano Monitoring: Experiences From the MIROVA System

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“…; Völker et al 2011] and largely composed of basaltic to andesitic composition lavas [de Maisonneuve et al 2012]. Up to 54 documented eruptions have occurred at the volcano since the 17 th century [Franco et al 2019;Naranjo and Moreno 2005]. The most recent episode, from 2007 to 2009, was the strongest since the 1950s with ash columns reaching 7 km above sea level and lahars generated by melting glacial ice [Franco et al 2019].…”

Section: Llaima Volcanomentioning

confidence: 99%

Investigating potential icequakes at Llaima volcano, Chile

Lamb¹,

Lees

Franco-Marin³

et al. 2020

Volcanica

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Glacially-and magmatically-derived seismic events have been noted to heavily overlap in their characteristics, thus there exists the potential for false-alarms or missed warnings at ice-covered volcanoes. Here we present the first study to specifically investigate icequakes at an ice-covered volcano in Southern Chile. Two months of broadband seismic data collected at Llaima volcano in 2015 were analyzed in order to quantify, characterize, and locate potential glacially-derived seismic events at one of the most active ice-covered volcanoes in the region. We find over 1,000 repeating seismic events across 11 families, the largest of which contains 397 events. Approximate locations and characteristics of the largest families lead us to conclude that these events were derived from persistent stick-slip motion along the ice-rock interface at the base of a glacier near the volcano summit. These results have implications for future seismic monitoring at Llaima volcano and other ice-covered active volcanoes in the region. Resumen Se ha observado que los fenómenos sísmicos derivados de los glaciares y magmáticos se superponen en gran medida en las características, por lo que existe la posibilidad de que se produzcan falsas alarmas o de que se pasen por alto las alertas en los volcanes cubiertos de hielo. Aquí presentamos el primer estudio que apunta específicamente a los terremotos en un volcán cubierto de hielo en el sur de Chile. Se analizaron dos meses de datos sísmicos de banda ancha recolectados en el volcán Llaima en 2015 para cuantificar, caracterizar y localizar eventos sísmicos derivados de glaciares en uno de los volcanes cubiertos de hielo más activos de la región. Encontramos más de 1,000 eventos sísmicos repetidos en 11 familias, el más grande de los cuales contiene 397 eventos. Las ubicaciones y características aproximadas de las familias más grandes nos llevan a la conclusión de que estos eventos se derivaron de un movimiento persistente de stick-slip a lo largo de la interfase de la roca de hielo en la base de un glaciar cerca de la cima del volcán. Estos resultados tienen implicaciones para el futuro monitoreo sísmico en el volcán Llaima y otros volcanes activos cubiertos de hielo en la región.

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“…; Völker et al, 2011) and largely composed of basaltic to andesitic composition lavas (de Maisonneuve et al, 2012). Up to 54 documented eruptions have occurred at the volcano since the 17 th century (Naranjo and Moreno, 2005;Franco et al, 2019). The most recent episode, from 2007 to 2009, was the strongest since the 1950's with ash columns reaching 7 km above sea level and lahars generated by melting glacial ice (Franco et al, 2019).…”

Section: Llaima Volcanomentioning

confidence: 99%

“…We defined the grid of source nodes using a 29 m horizontal and 37 m vertical resolution. A previous study used a seismic velocity of 2.5 kms -1 for the surface layer to calculate seismic power for continuous tremor recorded during the 2007-2009 eruptive period (Franco et al, 2019). A compilation of seismic velocity profiles for andesitic-basaltic volcanoes suggest that P-wave velocities range from approximately 0.5 kms -1 at the surface up to 6 kms -1 at 4 km depth (Lesage et al, 2018).…”

Section: Location Of Largest Familiesmentioning

confidence: 99%

“…Llaima volcano has had at least two permanent seismic stations for monitoring activity since 2006, with more stations added during and after the 2007-09 eruptive episode (Franco et al, 2019). Why have the sequences of low-frequency, low-amplitude families described here not been detailed in previous work or in the OVDAS seismic catalog for the volcano?…”

Section: Llaima Icequakesmentioning

confidence: 99%

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Investigating potential icequakes at Llaima volcano, Chile

Lamb¹,

Lees²,

Marı́n³

et al. 2019

Preprint

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Glacially- and magmatically-derived seismic events have been noted to heavily overlap in characteristics, thus there exists the potential for false-alarms or missed warnings at ice-covered volcanoes. Here we present the first study to specifically target icequakes at an ice-covered volcano in Southern Chile. Two months of broadband seismic data collected at Llaima volcano in 2015 were analyzed in order to quantify, characterize, and locate glacially-derived seismic events at one of the most active ice-covered volcanoes in the region. We find over 1,000 repeating seismic events across 11 families, the largest of which contains 397 events. Approximate locations and characteristics of the largest families lead us to conclude that these events were derived from persistent stick-slip motion along the ice-rock interface at the base of a glacier near the volcano summit. These results have implications for future seismic monitoring at Llaima volcano and other ice-covered active volcanoes in the region.

show abstract

Eruptive sequence and seismic activity of Llaima volcano (Chile) during the 2007–2009 eruptive period: Inferences of the magmatic feeding system

Cited by 17 publications

References 69 publications

Thermal Remote Sensing for Global Volcano Monitoring: Experiences From the MIROVA System

Thermal Remote Sensing for Global Volcano Monitoring: Experiences From the MIROVA System

Investigating potential icequakes at Llaima volcano, Chile

Investigating potential icequakes at Llaima volcano, Chile

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