Arc volcano activity driven by small-scale metasomatism of the magma source

Vlastelić, Ivan; Sainlot, N.; Samaniego, Pablo; Bernard, Benjamin; Nauret, François; Hidalgo, Silvana; Auclair, Delphine; Gannoun, Abdelmouhcine

doi:10.1038/s41561-023-01143-0

Cited by 5 publications

(3 citation statements)

References 58 publications

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“…After an 80-year pause, Tungurahua reawakened in late 1999, undergoing alternating phases of quiescence and explosive activity until March 2016 (Vlastélic et al 2023). The eruptions produced tephra fallout that usually affected the western and southwestern sectors of the volcano (Eychenne et 1b, c and d).…”

Section: Introductionmentioning

confidence: 99%

“…The 2006 tephra contained coarser particles (> 500 µm) than the 2015 and 2016 materials, which had similar GSDs (Figure S1). During the 1999-2016 eruptive activity, the magma composition of Tungurahua was primarily andesitic (Hall et al 1999;Hall and Mothes 2008;Samaniego et al 2008;Vlastélic et al 2023). The surface composition of tephra specimens was analysed by Guevara (2015) and revealed low concentrations of anions and cations in the leachate, which is typical of purely magmatic eruptions (Ayris and Delmelle 2012).…”

Section: Introductionmentioning

confidence: 99%

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A quantitative assessment of crop vulnerability to tephra hazard at Tungurahua volcano, Ecuador: understanding the effect of volcanic and biological factors

Ligot,

Viera,

Peñaherrera

et al. 2024

Bull Volcanol

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Crops are regularly impacted by tephra from explosive volcanic eruptions, causing signi cant economic losses and jeopardizing farmers' livelihood at the local to regional scales. Crop vulnerability to tephra remains poorly understood, impeding the construction of robust risk models for agriculture. Previous studies of crop vulnerability to tephra are semi-quantitative and consider tephra accumulation as the only hazard intensity metric. Here, we provide a robust evaluation of crop vulnerability based on the analysis of 700 sets of quantitative data, allowing for the assessment of the in uence of various volcanic and non-volcanic factors. We collected farmers' perceptions of damage to fodders, root and tuber crops, leafy crops, legumes, cereals, tree fruits, non-tree fruits, and estimations of their yield loss due to the

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A quantitative assessment of crop vulnerability to tephra hazard at Tungurahua volcano, Ecuador: understanding the effect of volcanic and biological factors

Ligot,

Viera,

Peñaherrera

et al. 2024

Bull Volcanol

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“…more recently, an eruptive episode that lasted since 1999 until 2016 (Bernard et al 2016;Samaniego et al 2011;Vlastélic et al 2023). In addition, during the Late Holocene, Tungurahua experienced Plinian eruptions and sector collapses (Le Pennec et al , 2013, which demonstrate the potential of Tungurahua volcano to generate long-runout distance pyroclastic density currents (PDCs) and thick fallout deposits, posing a permanent threat to the surrounding communities, such as the city of Baños and other villages in the Tungurahua and Chimborazo Provinces (Fig.…”

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confidence: 99%

Probabilistic hazard assessment for pyroclastic density currents at Tungurahua volcano, Ecuador

Aravena,

Tadini,

Bevilacqua

et al. 2024

Preprint

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We assess the volcanic hazard derived from pyroclastic density currents (PDCs) at Tungurahua volcano, Ecuador, using a probabilistic approach based on the analysis of calibrated numerical simulations. We address the expected variability of explosive eruptions at Tungurahua volcano by adopting a scenario-based strategy, where we consider three cases: small magnitude violent Strombolian to Vulcanian eruption (VEI 2), intermediate magnitude sub-Plinian eruption (VEI 3), and large magnitude sub-Plinian to Plinian eruption (VEI 4–5). PDCs are modeled using the branching energy cone model and the branching box model, considering reproducible calibration procedures based on the geological record of Tungurahua volcano. The use of different calibration procedures and reference PDC deposits allows us to define uncertainty ranges for the inundation probability of each scenario. Numerical results indicate that PDCs at Tungurahua volcano propagate preferentially toward W and NW, where a series of catchment ravines can be recognized. Two additional valleys of channelization are observed in the N and NE flanks of the volcano, which may affect the city of Baños. The mean inundation probability calculated for Baños is small (6 ± 3%) for PDCs similar to those emplaced during the VEI 2 eruptions of July 2006, February 2008, May 2010, July 2013, February 2014 and February 2016, and on the order of 13 ± 4% for a PDC similar to that produced during the sub-Plinian phase of the August 2006 eruption (VEI 3). The highest energy scenario (VEI 4–5), for which we present and implement a novel calibration procedure based on a few control points, produces inundation areas that nearly always include inhabited centers such as Baños, Puela and Cotaló, among others. This calibration method is well suited for eruptive scenarios that lack detailed field information, and could be replicated for poorly-known active volcanoes around the world.

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Probabilistic, scenario-based hazard assessment for pyroclastic density currents at Tungurahua volcano, Ecuador

Aravena,

Tadini,

Bevilacqua

et al. 2024

Bull Volcanol

View full text Add to dashboard Cite

We assess the volcanic hazard posed by pyroclastic density currents (PDCs) at Tungurahua volcano, Ecuador, using a probabilistic approach based on the analysis of calibrated numerical simulations. We address the expected variability of explosive eruptions at Tungurahua volcano by adopting a scenario-based strategy, where we consider three cases: violent Strombolian to Vulcanian eruption (VEI 2), sub-Plinian eruption (VEI 3), and sub-Plinian to Plinian eruption (VEI 4–5). PDCs are modeled using the branching energy cone model and the branching box model, considering reproducible calibration procedures based on the geological record of Tungurahua volcano. The use of different calibration procedures and reference PDC deposits allows us to define uncertainty ranges for the inundation probability of each scenario. Numerical results indicate that PDCs at Tungurahua volcano propagate preferentially toward W and NW, where a series of catchment ravines can be recognized. Two additional valleys of channelization are observed in the N and NE flanks of the volcano, which may affect the city of Baños. The mean inundation probability calculated for Baños is small (6 ± 3%) for PDCs similar to those emplaced during recent VEI 2 eruptions (July 2006, February 2008, May 2010, July 2013, February 2014, and February 2016), and on the order of 13 ± 4% for a PDC similar to that produced during the sub-Plinian phase of the August 2006 eruption (VEI 3). The highest intensity scenario (VEI 4–5), for which we present and implement a novel calibration procedure based on a few control points, produces inundation areas that nearly always include inhabited centers such as Baños, Puela, and Cotaló, among others. This calibration method is well suited for eruptive scenarios that lack detailed field information, and could be replicated for poorly known active volcanoes around the world.

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Arc volcano activity driven by small-scale metasomatism of the magma source

Cited by 5 publications

References 58 publications

A quantitative assessment of crop vulnerability to tephra hazard at Tungurahua volcano, Ecuador: understanding the effect of volcanic and biological factors

A quantitative assessment of crop vulnerability to tephra hazard at Tungurahua volcano, Ecuador: understanding the effect of volcanic and biological factors

Probabilistic hazard assessment for pyroclastic density currents at Tungurahua volcano, Ecuador

Probabilistic, scenario-based hazard assessment for pyroclastic density currents at Tungurahua volcano, Ecuador

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