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- W2065219544 abstract "Abstract Approximately every 100,000 years the Earth experiences catastrophic caldera-forming “supereruptions” that are considered to be one of the most hazardous natural events on Earth. Utilizing new temperature-dependent, viscoelastic numerical models that incorporate a Mohr-Coulomb failure criterion, we find that eruptive failure of the largest magma chambers is a function of the geometry of the overlying roof and the location of the brittle-ductile transition. In particular, the ductile halo created around the hot magma chamber buffers increasing overpressures and prevents pressure relief via magmatic injection from the magma chamber. The numerical results indicate that as chamber volume increases, the higher temperatures in the host rock and the decrease in the roof aspect ratio cause a shift from reservoir-triggered eruption to an external roof-triggered mechanism. Specifically, as overpressure increases within the largest magma chambers, extensive uplift in the overlying roof promotes the development of through-going faults that may trigger eruption and caldera collapse from above. We find that for magma chamber volumes > 103 km3, and roof aspect ratios (depth/width)" @default.
- W2065219544 created "2016-06-24" @default.
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- W2065219544 date "2012-10-01" @default.
- W2065219544 modified "2023-10-04" @default.
- W2065219544 title "Catastrophic caldera-forming eruptions: Thermomechanics and implications for eruption triggering and maximum caldera dimensions on Earth" @default.
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- W2065219544 doi "https://doi.org/10.1016/j.jvolgeores.2012.06.009" @default.
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