Seismicity accompanying the 1999 eruptive episode at Telica Volcano, Nicaragua

Rodgers, Mel; Roman, Diana C.; Geirsson, H.; LaFemina, Peter; Muñoz, Angélica; Guzmán, Carlos E; Tenorio, Virginia

doi:10.1016/j.jvolgeores.2013.08.010

Cited by 28 publications

(28 citation statements)

References 42 publications

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“…We further note that most 'background' seismic events at Telica are low-frequency events commonly associated with gas or fluid flow through constricted pathways (Chouet and Matoza, 2013). The sealing-pressurization-explosion model is similar to that proposed for longer-term seismic quiescence prior to recent eruptive episodes at Telica (Rodgers et al, 2013;Geirsson et al, 2014;Rodgers et al, 2015), but also explains the observed relationship between the duration of the closed-system phase and the energy of the ensuing explosion.…”

Section: Mechanism Of Precursory Seismic Quiescencesupporting

confidence: 67%

“…Telica is characterized by persistent restlessness (incandescence, high rates of degassing, and hundreds of low-frequency (LF) seismic events/day), interrupted by VEI 1 Vulcanian phreatic explosions every few years (e.g., in 2004, 2006, 2007Global Volcanism Program, 2009a, 2009b. More explosive (VEI 2) eruptions occurred in 1999in , 2011in (Rodgers et al, 2013Geirsson et al, 2014;Rodgers et al, 2015;Global Volcanism Program, 2015). Beginning in November 2009, we deployed the TESAND (Telica Seismic and Deformation) network to record continuous broadband seismic, infrasound, and GPS data with the aim of characterizing background and low-level eruptive processes at persistently restless volcanoes.…”

Section: Introductionmentioning

confidence: 99%

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Assessing the likelihood and magnitude of volcanic explosions based on seismic quiescence

Roman

Rodgers

Geirsson

et al. 2016

Earth and Planetary Science Letters

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Available online xxxx Editor: P. Shearer Keywords: volcano monitoring volcanic hazards phreatic explosions seismic quiescence Telica VolcanoVolcanic eruptions are generally forecast based on strong increases in monitoring parameters such as seismicity or gas emissions above a relatively low background level (e.g., Voight, 1988;Sparks, 2003). Because of this, forecasting individual explosions during an ongoing eruption, or at persistently restless volcanoes, is difficult as seismicity, gas emissions, and other indicators of unrest are already in a heightened state. Therefore, identification of short-term precursors to individual explosions at volcanoes already in heightened states of unrest, and an understanding of explosion trigger mechanisms, is important for the reduction of volcanic risk worldwide. Seismic and visual observations at Telica Volcano, Nicaragua, demonstrate that a) episodes of seismic quiescence reliably preceded explosions during an eruption in May 2011 and b) the duration of precursory quiescence and the energy released in the ensuing explosion were strongly correlated. Precursory seismic quiescence is interpreted as the result of sealing of shallow gas pathways, leading to pressure accumulation and eventual catastrophic failure of the system, culminating in an explosion. Longer periods of sealing and pressurization lead to greater energy release in the ensuing explosion. Near-real-time observations of seismic quiescence at restless or erupting volcanoes can thus be useful for both timely eruption warnings and for forecasting the energy of impending explosions.

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Section: Mechanism Of Precursory Seismic Quiescencesupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Assessing the likelihood and magnitude of volcanic explosions based on seismic quiescence

Roman

Rodgers

Geirsson

et al. 2016

Earth and Planetary Science Letters

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“…The past eruptive story of Telica comprises at least ten important eruptions of vulcanian and strombolian styles since 1527, including the 1982 eruption that emitted a 3.7-4.3-km high column, from which ash fallout covered a distance of 37 km from the crater to the city of Corinto (novák and Přichystal 2006). Currently, small explosive events are expected to take place every 1-5 years (Rodgers et al 2013). For the past 5 years, SO 2 emissions have remained rather low, ranging between 70 and 200 t day …”

Section: Telica Volcanomentioning

confidence: 99%

Measurements of volcanic SO2 and CO2 fluxes by combined DOAS, Multi-GAS and FTIR observations: a case study from Turrialba and Telica volcanoes

Conde

Robidoux

Avard³

et al. 2014

Int J Earth Sci (Geol Rundsch)

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crateric SO 2 emissions, and electrochemical/nDIR multicomponent gas analyser system (multi-GaS) instruments for measuring CO 2 /SO 2 ratios of excerpts of the volcanic plume. This study aims to quantify the representativeness of excerpts of CO 2 /SO 2 ratios measured by Multi-GaS as a fraction of the whole plume composition, by comparison with simultaneously measured CO 2 /SO 2 ratios using crosscrater Fourier transform infrared spectroscopy (FTIR). Two study cases are presented: Telica volcano (nicaragua), with a homogenous plume, quiescent degassing from a deep source and ambient temperature, and Turrialba volcano (Costa Rica), which has a non-homogeneous plume from three main sources with different compositions and temperatures. Our comparison shows that in our "easier case" (Telica), FTIR and Multi-GaS CO 2 /SO 2 ratios agree within a factor about 3 %. In our "complicated case" (Turrialba), Multi-GaS and FTIR yield CO 2 /SO 2 ratios differing by approximately 13-25 % at most. These results suggest that a fair estimation of volcanic CO 2 emissions can be provided by the combination of DOaS and Multi-GaS instruments for volcanoes with similar degassing conditions as Telica or Turrialba. Based on the results of this comparison, we report that by the time our measurements were made, Telica and Turrialba were emitting approximately 100 and 1,000 t day −1 of CO 2 , respectively.

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“…Repeating LF waveforms have been observed in many different types of volcanic settings, including dome-forming eruptions at Redoubt, Alaska; Unzen, Japan; Mount St Helens, Washington; Bezymianny, Kamchatka; and SHV Lamb et al, 2015;Thelen et al, 2011;West, 2013;Green and Neuberg, 2006;Ottemöller, 2008;De Angelis, 2009]; at persistently restless volcanoes such as Telica, Nicaragua, and Shishaldin, Alaska [Rodgers et al, 2013[Rodgers et al, , 2015aPetersen, 2007]; and at basaltic systems such as Kilauea, Hawaii [Battaglia et al, 2003]. Repeating families (multiplets) are often used to improve locations [Battaglia et al, 2003], determine depth of explosive activity [West, 2013;Thelen et al, 2011], constrain source mechanisms , and assess the stability of seismic sources [Rodgers et al, 2013] and the stability of stress fields [West, 2013]. Figure 1) began erupting in 1995, and for the last 20 years has repeatedly transitioned between quiescent, effusive, and explosive phases of activity ( Figure 2) [Kokelaar, 2002;Wadge et al, 2014].…”

Section: Seismicity During Dome-forming Eruptionsmentioning

confidence: 99%

“…Repeating earthquakes are found during most significant seismic swarms at volcanoes [ West , ], and their presence alone is not indicative of eruptive processes. Repeating LF waveforms have been observed in many different types of volcanic settings, including dome‐forming eruptions at Redoubt, Alaska; Unzen, Japan; Mount St Helens, Washington; Bezymianny, Kamchatka; and SHV [ Power et al , ; Lamb et al , ; Thelen et al , ; West , ; Green and Neuberg , ; Ottemöller , ; De Angelis , ]; at persistently restless volcanoes such as Telica, Nicaragua, and Shishaldin, Alaska [ Rodgers et al , , ; Petersen , ]; and at basaltic systems such as Kilauea, Hawaii [ Battaglia et al , ]. Repeating families (multiplets) are often used to improve locations [ Battaglia et al , ], determine depth of explosive activity [ West , ; Thelen et al , ], constrain source mechanisms [ Green and Neuberg , ], and assess the stability of seismic sources [ Rodgers et al , ] and the stability of stress fields [ West , ].…”

Section: Introductionmentioning

confidence: 99%

Quiescent‐explosive transitions during dome‐forming volcanic eruptions: Using seismicity to probe the volcanic processes leading to the 29 July 2008 vulcanian explosion of Soufrière Hills Volcano, Montserrat

et al. 2016

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The July 2008 vulcanian explosion at Soufrière Hills Volcano (SHV), Montserrat, was preceded by one of the largest seismic swarms observed since the start of the eruption. We analyze the spectral and waveform properties of the earthquakes in this swarm and compare these observations to models of subsurface volcanic processes. We observe an initial volcano‐tectonic (VT) swarm, followed by a large low‐frequency (LF) swarm. We observe that the spectral content of LF events changes over time to carry more energy at lower frequencies. This shift to a lower frequency spectral content is concurrent with an increase in LF event rates. Ash‐venting occurred a few hours before peak event rate. There was a subsequent increase in the higher‐frequency energy component of LF events, concurrent with a decrease in event rates. Seismic quiescence occurred in the final 7 h before the vulcanian explosion. Our observations of VT seismicity are consistent with a model of decoupled gas ascent prior to magma emplacement. Changes in spectral properties and event rates suggest changes in conduit properties and/or pressure changes during magma ascent and stalling in the few days before the explosion. This interpretation is supported by previous petrological observations. Our analysis of repeating earthquakes suggests that hybrid and long‐period events are part of the same source process and should not be considered separate classifications, at least at SHV. Our analysis highlights the potential of using simple spectral and waveform analyses for understanding changes in the magmatic system during transitions between quiescence and eruption.

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Seismicity accompanying the 1999 eruptive episode at Telica Volcano, Nicaragua

Cited by 28 publications

References 42 publications

Assessing the likelihood and magnitude of volcanic explosions based on seismic quiescence

Assessing the likelihood and magnitude of volcanic explosions based on seismic quiescence

Measurements of volcanic SO2 and CO2 fluxes by combined DOAS, Multi-GAS and FTIR observations: a case study from Turrialba and Telica volcanoes

Quiescent‐explosive transitions during dome‐forming volcanic eruptions: Using seismicity to probe the volcanic processes leading to the 29 July 2008 vulcanian explosion of Soufrière Hills Volcano, Montserrat

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