Alteration‐Induced Volcano Instability at La Soufrière de Guadeloupe (Eastern Caribbean)
نویسندگان
چکیده
Volcanoes are unstable structures that deform laterally and frequently experience mass wasting events. Hydrothermal alteration is often invoked as a mechanism contributes significantly to volcano instability. We present study combines laboratory experiments, geophysical data, large-scale numerical modeling better understand the influence of on stability, using La Soufrière de Guadeloupe (Eastern Caribbean) case study. Laboratory experiments variably altered (advanced argillic alteration) blocks show uniaxial compressive strength, Young's modulus, cohesion decrease function increasing alteration, but internal friction angle does not change systematically. Simplified cross sections were prepared (a homogenous volcano, containing zone identified by recent electrical survey, with an artificially enlarged area mechanical properties assigned zones corresponding unaltered rock. Numerical performed these sections, hydro-thermo-mechanical code, (a) importance upscaled values in models (b) increases deformation collapse volume. Finally, we combined published muon tomography data our create 3D strength map, exposing low-strength beneath southern flank coincident hydrothermal system. conclude decreases stability thus expedites spreading likelihood events associated volcanic hazards. its evolution, should therefore be monitored at active volcanoes worldwide.
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ژورنال
عنوان ژورنال: Journal Of Geophysical Research: Solid Earth
سال: 2021
ISSN: ['2169-9356', '2169-9313']
DOI: https://doi.org/10.1029/2021jb022514