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Volume 6, issue 2
Solid Earth, 6, 553–572, 2015
https://doi.org/10.5194/se-6-553-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Solid Earth, 6, 553–572, 2015
https://doi.org/10.5194/se-6-553-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 21 May 2015

Research article | 21 May 2015

Syn-eruptive, soft-sediment deformation of deposits from dilute pyroclastic density current: triggers from granular shear, dynamic pore pressure, ballistic impacts and shock waves

G. A. Douillet et al.

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Cited articles

Allen, J. and Banks, N.: An interpretation and analysis of recumbent-folded deformed cross-bedding, Sedimentology, 19, 257–283, 1972.
Alsop, G. and Marco, S.: Soft-sediment deformation within seismogenic slumps of the Dead Sea Basin, J. Struct. Geol., 33, 433–457, 2011.
Alsop, G. I. and Marco, S.: Tsunami and seiche-triggered deformation within offshore sediments, Sediment. Geol., 261, 90–107, 2012.
Andrews, G. D. and Branney, M. J.: Emplacement and rheomorphic deformation of a large, lava-like rhyolitic ignimbrite: Grey's Landing, southern Idaho, Geol. Soc. Am. Bull., 123, 725–743, 2011.
Bernard, J., Kelfoun, K., Le Pennec, J.-L., and Vargas, S. V.: Pyroclastic flow erosion and bulking processes: comparing field-based vs. modeling results at Tungurahua volcano, Ecuador, B. Volcanol., 76, 1–16, 2014.
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Short summary
Sedimentary beds can exhibit signs of local deformation in pyroclastic strata. Patterns are reviewed and trigger mechanisms interpreted. During an eruption, basal granular flows can have a fluidized behavior, inducing over- or underpressure at the bed interface. Basal shear can overturn strata. Large blocks ejected ballistically deform the ground when landing. Explosions at the vent produce shock waves that can destabilize a bed. These syn-eruptive triggers are specific to explosive volcanism.
Sedimentary beds can exhibit signs of local deformation in pyroclastic strata. Patterns are...
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