Possible structural control on the 2011 eruption of Puyehue-Cordón Caulle Volcanic Complex (southern Chile) determined by InSAR, GPS and seismicity

Wendt, Anja; Tassara, Andrés Ollero; Báez, J. C.; Basualto, Daniel; Lara, Luis E.; García, Francisco García

doi:10.1093/gji/ggw355

Cited by 17 publications

(40 citation statements)

References 55 publications

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“…The CSK and S1 descending and the ALOS-2 and RS2 time series do not show clear unambiguous uplift signals after February 2017; thus, we interpret this to mean that the 2016-2017 inflation event ended during February 2017. The spatial footprint of the 2016-2017 inflation is very similar to that of the 2012-2015 event ( Figure 1) and different from those of the preeruptive and coeruptive deformation signals (Euillades et al, 2017;Jay et al, 2014;Wendt et al, 2017). The InSAR and GPS time series indicate an additional pulse of ∼5 cm/year of inflation between May 2017 and May 2018 ( Figure 2), although more data are required to thoroughly confirm this.…”

Section: Insar Data and 2016-2018 Ground Deformationmentioning

confidence: 82%

“…Journal of Geophysical Research: Solid Earth 10.1029/2018JB016240 Table 5 Seismic Wave Velocities (Wendt et al, 2017) Note. The density of the first 8.5 km is from the gravity model of Sepulveda et al (2005) and was used as the background value of the upper crust.…”

Section: Finite Element Linear Viscoelastic Modelmentioning

confidence: 99%

“…Although other studies have assumed that most of the medium is viscoelastic (e.g., Del Negro et al, 2009;Hickey et al, 2013), we consider this an unlikely situation for the short timescales of ground deformation (months to years) and because all the preeruptive, coeruptive, and posteruptive deformation sources (Jay et al, 2014) are shallow (depths between 4 and 6 km) and located just beneath Cordón Caulle. We incorporate the effect of 1-D 10.1029/2018JB016240 elastic layering using the seismic velocity model of Wendt et al (2017) and the density models of Tasarova (2007) and Sepulveda et al (2005; Table 5).…”

Section: Finite Element Modelmentioning

confidence: 99%

“…Before 2010 the sparse volcano seismic network recorded an increase in the seismicity between June 2007 and January 2008 (Wendt et al, 2017), coincident with ∼20 cm of uplift during 2007(Jay et al, 2014. However, detailed earthquake statistics are only available after April 2010 ( Figure 10).…”

Section: Relation Between Deformation and Seismicitymentioning

confidence: 99%

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Renewed Posteruptive Uplift Following the 2011–2012 Rhyolitic Eruption of Cordón Caulle (Southern Andes, Chile): Evidence for Transient Episodes of Magma Reservoir Recharge During 2012–2018

et al. 2018

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The VEI 4 rhyolitic eruption of Cordón Caulle volcano in 2011–2012 was immediately followed by ∼0.77 m of exponentially decaying uplift during 2012–2015. In this study, we present evidence of additional transient pulses of inflation with interferometric synthetic aperture radar (InSAR) time series during 2016–2018. We also assess whether the 2012–2015 uplift can be explained by viscoelastic relaxation or not. InSAR detected ∼12 cm of uplift during 2016–2017 and ∼5 cm during 2017–2018. The three inflation episodes have very similar spatial scales and can be modeled with the same inflating sill (z ∼ 6 km), but their time evolution is significantly different. Numerical models of a pressurized reservoir surrounded by a viscoelastic shell do not have a better fit than a magma injection model to the 2012–2015 InSAR time series, indicating that magma injection is the most likely mechanism to explain this uplift signal. The spatial similarities of the three pulses suggest that they are produced by episodic magma injection. These magma injection pulses provide the heat to remobilize the crystal mush beneath the volcano on timescales of a few months, but the end of the uplift is not predicted by existing models. None of these uplift pulses were related to abnormal seismicity, and we speculate that they are mostly aseismic because they caused stresses of lower magnitude than the coeruptive stresses. The meter scale displacement observed at Cordón Caulle between 2007 and 2018 suggests that the volcano undergoes episodic cycles of inflation like those observed in silicic calderas.

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Section: Insar Data and 2016-2018 Ground Deformationmentioning

confidence: 82%

Section: Finite Element Linear Viscoelastic Modelmentioning

confidence: 99%

Section: Finite Element Modelmentioning

confidence: 99%

Section: Relation Between Deformation and Seismicitymentioning

confidence: 99%

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Renewed Posteruptive Uplift Following the 2011–2012 Rhyolitic Eruption of Cordón Caulle (Southern Andes, Chile): Evidence for Transient Episodes of Magma Reservoir Recharge During 2012–2018

et al. 2018

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“…The nine-month 2011-2012 eruption is the only one with instrumental observations at this volcano, and was preceded by several years of InSAR-detected ground deformation from 2007 to 2009 and early 2011 (figure 4a). Seismic observations are only available since mid-2010, and show a clear seismicity increase two months before the eruption [154], in agreement with the preeruptive ground deformation. Despite the seismic and deformation pre-cursors [150], there was no observed increase in temperatures of the fumarole fields even three weeks before the eruption with respect to a measurement made more than 1 year before ( figure 4b-d).…”

Section: (F) Cordón Caulle Chile: Subduction Zonementioning

confidence: 71%

Thoughts on the criteria to determine the origin of volcanic unrest as magmatic or non-magmatic

Pritchard

Mather

McNutt

et al. 2019

Phil. Trans. R. Soc. A.

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As our ability to detect volcanic unrest improves, we are increasingly confronted with the question of whether the unrest has a magmatic origin (magma on the move) or a non-magmatic origin from a change in the hydrothermal system (fluids that are not magma on the move) or tectonic processes. The cause of unrest has critical implications for the potential eruptive hazard (e.g. used in constructing Bayesian Event Trees), but is frequently the subject of debate, even at well-studied systems. Here, we propose a set of multi-disciplinary observations and numerical models that could be used to evaluate conceptual models about the cause of unrest. These include measurements of gas fluxes and compositions and the isotopic signature of some components (e.g. H 2 , He, C, SO 2 , H 2 O , CH 4 and CO 2 ), the spatial and temporal characteristics of ground deformation, thermal output, seismicity, changes in gravity, and whether there is topographic uplift or subsidence spanning hundreds to thousands of years. In several volcanic systems, both magmatic and non-magmatic unrest is occurring at the same time. While none of these observations or models is diagnostic on its own, we illustrate several examples where they have been used together to make a plausible conceptual model of one or more episodes of unrest and whether eruptions did or did not follow the unrest. This article is part of the Theo Murphy meeting issue ‘Magma reservoir architecture and dynamics’.

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Understanding multi-vent Plinian eruptions at Mt. Tongariro Volcanic Complex, New Zealand

2020

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Possible structural control on the 2011 eruption of Puyehue-Cordón Caulle Volcanic Complex (southern Chile) determined by InSAR, GPS and seismicity

Cited by 17 publications

References 55 publications

Renewed Posteruptive Uplift Following the 2011–2012 Rhyolitic Eruption of Cordón Caulle (Southern Andes, Chile): Evidence for Transient Episodes of Magma Reservoir Recharge During 2012–2018

Renewed Posteruptive Uplift Following the 2011–2012 Rhyolitic Eruption of Cordón Caulle (Southern Andes, Chile): Evidence for Transient Episodes of Magma Reservoir Recharge During 2012–2018

Thoughts on the criteria to determine the origin of volcanic unrest as magmatic or non-magmatic

Understanding multi-vent Plinian eruptions at Mt. Tongariro Volcanic Complex, New Zealand

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