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dc.contributor.authorMoon, Vicki G.
dc.contributor.authorBradshaw, Jennifer
dc.contributor.authorde Lange, Willem P.
dc.date.accessioned2010-05-02T23:51:33Z
dc.date.available2010-05-02T23:51:33Z
dc.date.issued2009
dc.identifier.citationMoon, V., Bradshaw, J. & de Lange, W. (2009). Geomorphic development of White Island Volcano based on slope stability modelling. Engineering Geology, 104(1-2), 16-30.en
dc.identifier.urihttps://hdl.handle.net/10289/3835
dc.description.abstractWhite Island shows many geomorphic features associated with stratovolcanoes that have undergone major sector collapse, most notably the flat-floored amphitheatre comprising the present crater. ArcGIS is used to develop a reconstructed pre-failure cone and 2D limiting-equilibrium stability analysis is undertaken of the reconstructed cone. Water table ranges from 0% (dry) to 100% (saturated) are assumed and earthquake accelerations of 0–0.5 g bracket the likely range of accelerations expected in a volcanic setting; geotechnical data from Moon et al. [Moon, V., Bradshaw, J., Smith, R. and de Lange, W., 2005. Geotechnical characterization of stratocone crater wall sequences, White Island Volcano, New Zealand. Engineering Geology, 81: 146–178] are used. The models suggest that flank failure is a feasible explanation for the present-day geomorphology, and indicate that there were at least two retrogressive failures. The best model sees a core of hydrothermally altered material overlying relatively unaltered andesite lavas and breccias, where accelerations of 0.17 g (saturated slope) to 0.45 g (dry slope) are required to initiate failure (F = 1.0). The failure modelled was relatively small (volume of 0.21 km3), and would have mostly involved hydrothermally altered materials with some fresh rock mass. Two toreva blocks are recognised occupying the seaward margin of the amphitheatre, with a lobe of debris offshore suggested as the debris avalanche deposits. Modification of both the outer slopes of the island and the inner crater walls has occurred since the failure event, especially on the southwestern margin of the crater. Modelling suggests that further failure of the inner walls is likely and poses a significant hazard to tourists visiting the island; further outer slope failures are unlikely.en
dc.language.isoen
dc.publisherElsevieren_NZ
dc.subjectWhite Islanden
dc.subjectvolcanic slope stabilityen
dc.subjectedifice failureen
dc.subjectstratovolcanoen
dc.titleGeomorphic development of White Island Volcano based on slope stability modellingen
dc.typeJournal Articleen
dc.identifier.doi10.1016/j.enggeo.2008.08.003en
dc.relation.isPartOfEngineering Geologyen_NZ
pubs.begin-page16en_NZ
pubs.elements-id33688
pubs.end-page30en_NZ
pubs.issue1-2en_NZ
pubs.volume104en_NZ


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