On the genesis of a massive Holocene rock avalanche deposit in the Yeso River catchment, Andes Cordillera of central Chile

Melo, Vicente; Easton, Gabriel; Rebolledo, Sofía

doi:10.1016/j.geomorph.2022.108214

Cited by 3 publications

(2 citation statements)

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“…[C] The Valenzuela and the Los Ciegos PDCs are compared to other block-and-ash and pumice flows also reported by Tost et al [2014]. The Antuco 7.1 ka [Romero et al 2022] and Marmolejo 2.4 ka [Melo et al 2022] debris avalanches are also plotted for comparison.…”

Section: Geochemistrymentioning

confidence: 99%

“…A future debris avalanche of San José is not unlikely as its Pleistocene neighbor Mt. Marmolejo volcano produced a debris avalanche traveling 20 km west and descending 3.4 km from its source, only 2.4 ka BP [Thiele 1981;Melo et al 2022]. Hence, we urge incorporating the potential collapse events in the hazard assessment and their related debris avalanche hazard zones.…”

Section: Hazard Implicationsmentioning

confidence: 99%

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Rapid growth and catastrophic destruction events of Planchón Volcano, Southern Andes

Naranjo,

Romero,

Contreras

et al. 2024

Volcanica

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During the Late Pleistocene-to-Holocene, the mafic Planchón volcano (35.2 °S, Southern Andes) experienced two important destructive events: a sector collapse to the west and a multiphase explosive eruption transforming the east summit area. We provide new field and laboratory evidence, including geochemical, geochronologic, and geological-morphological analysis, to reconstruct the evolution, triggering mechanisms, and physical parameters of these events.The lateral collapse (48~ka BP) was mainly predisposed by a tectonically westward-inclined substratum and rapid edifice growth rates (0.3–0.48 km3 ka-1). The resulting Planchón-Teno debris avalanche became valley-confined traveling at c. 260 km h-1 up to 95 km distance and forming an 8.6 ± 1.3 km3 deposit. The resulting 4.1 km wide amphitheater was later destroyed at c. 7 ka BP by the multiphase Valenzuela phreatomagmatic eruptions, forming a c. 2.5 km diameter caldera. The case of the Planchón volcano warns that rapidly growing mafic volcanoes imply a substantial catastrophic hazard increase for the surrounding areas.

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Section: Geochemistrymentioning

confidence: 99%

Section: Hazard Implicationsmentioning

confidence: 99%