Anatomy of a high-silica eruption as observed by a local seismic network: The June 2011 Puyehue-Cordón Caulle event (southern Andes, Chile)
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Date
Authors
FARIAS VEGA, CRISTIAN ALEX
Basualto, Daniel
Tassara, Andrés
Lazo-Gil, Jonathan
Franco-Marin, Luis Enrique
Cardona, Carlos
San Martín, Juan
Gil-Cruz, Fernando
Calabi-Floddy, Marcela
Farías, Cristian
Basualto, Daniel
Tassara, Andrés
Lazo-Gil, Jonathan
Franco-Marin, Luis Enrique
Cardona, Carlos
San Martín, Juan
Gil-Cruz, Fernando
Calabi-Floddy, Marcela
Farías, Cristian
Authors
Date
Datos de publicación:
10.5194/se-14-69-2023
Keywords
Data Handling - Digital Storage - Seismology - Silica - Structural Dynamics - Explosive Eruption - High Silicas - Hypocentre - Natural Phenomenon - Near Fields - Puyehue - Rhyolitic Eruptions - Seismic Networks - Velocity Modeling - Volcanic Complex - Volcanoes - Focal Mechanism - Geodesy - Lava Flow - Network Analysis - Satellite Data - Seismic Source - Seismicity - Silica - Volcanic Earthquake - Volcanic Eruption - Los Rios [chile] - Puyehue-cordon Caulle - Southern Volcanic Zone
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Abstract
High-silica explosive eruptions are one of the most dangerous natural phenomena, yet it is unclear which processes are involved in this infrequent kind of event. We present the first systematic characterization of near-field seismicity associated with a large high-silica eruption analyzing data recorded before, during and after the 4 June 2011 rhyolitic eruption of Puyehue-Cordón Caulle Volcanic Complex (PCCVC). Results of a first-level data processing, developed by the Southern Andean Volcano Observatory (OVDAS) to monitor unrest and the evolution of the eruption, are complemented here with the relocation of hypocenters into a local 1D velocity model, the time series of the b value and the computation of the focal mechanism. This information allows us to define several phases before and after the onset of the eruption, describing details of the space-Time evolution of seismicity, defining and characterizing the seismic sources, and identifying the structural control of the magmatic intrusion and stress variations during the eruption. Our results illuminate several underlying processes, with emphasis on the possible role that basement structures had on the storage, transport and evacuation of magma. Integrating our results with previous findings based on satellite geodesy and petrology of erupted materials, we discuss general conceptual models regarding destabilization of structurally controlled acidic magmatic systems, the pass from unrest to eruption, and changes in eruptive style and waning phases of eruptions, with broader implications for monitoring and forecast of violent silicic eruptions. © 2023 Elsevier B.V., All rights reserved.
Description
Keywords
Data Handling , Digital Storage , Seismology , Silica , Structural Dynamics , Explosive Eruption , High Silicas , Hypocentre , Natural Phenomenon , Near Fields , Puyehue , Rhyolitic Eruptions , Seismic Networks , Velocity Modeling , Volcanic Complex , Volcanoes , Focal Mechanism , Geodesy , Lava Flow , Network Analysis , Satellite Data , Seismic Source , Seismicity , Silica , Volcanic Earthquake , Volcanic Eruption , Los Rios [chile] , Puyehue-cordon Caulle , Southern Volcanic Zone
Citation
10.5194/se-14-69-2023