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• W3190300892 abstract "Abstract Many explosive volcanic eruption sequences are characterized by exceedingly unsteady behavior, often punctuated by multiple explosive phases, separated by hours to days. What causes this unsteady behavior is not fully understood. Here, we explore one possible mechanism: stress‐driven failure of the volcanic conduit wall rock. We present a multiphase conduit flow model that predicts the shear and normal tractions exerted on the conduit wall, and couple (one way) these tractions with a numerical model of host rock failure. While analytical estimations of host rock stress serve as useful guides, analytical approximations which ignore shear tractions are insufficient to adequately predict conduit instability. Failure generally initiates near the fragmentation depth, where shear tractions are highest and magma pressure is low relative to the lithostatic stress. Shear tractions on the conduit wall, caused by viscous drag, promote strain localization and failure. The in situ stress state not only determines the range of conduit pressures which promotes failure, but also influences the style of failure. The mechanism that is most likely to lead to the disruption of flow, where wall rock moves radially into the conduit along normal faults, occurs in extensional stress regimes when large shear tractions at the fragmentation depth enhance normal fault formation. The results of this study indicate that conduit stability strongly depends on the ambient stress field and the nature of conduit flow at the fragmentation depth." @default.
• W3190300892 created "2021-08-16" @default.
• W3190300892 creator A5009593284 @default.
• W3190300892 creator A5023754718 @default.
• W3190300892 date "2021-08-01" @default.
• W3190300892 modified "2023-09-27" @default.
• W3190300892 title "Stress‐Driven Failure of Cylindrical Volcanic Conduits" @default.
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• W3190300892 doi "https://doi.org/10.1029/2021jb022278" @default.
• W3190300892 hasPublicationYear "2021" @default.
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