Geotechnical characterisation of stratocone crater wall sequences, White Island Volcano, New Zealand

Moon, Vicki G.; Bradshaw, Jennifer; Smith, Richard T.; Lange, Willem P. de

doi:10.1016/j.enggeo.2005.07.014

Cited by 60 publications

(45 citation statements)

References 37 publications

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“…Initially, an estimated height for the volcano was derived based on the dip of the inclined joints in the lava flows (42°; Moon et al, 2005). These "bedding" joints represent the topography on which the lava has been emplaced; this dip angle is also in keeping with the friction angle for clean joints (Table 1).…”

Section: Reconstruction Of Edificementioning

confidence: 99%

Geomorphic development of White Island Volcano based on slope stability modelling

Moon

Bradshaw

Lange

2009

Engineering Geology

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Section: Reconstruction Of Edificementioning

confidence: 99%

Geomorphic development of White Island Volcano based on slope stability modelling

Moon

Bradshaw

Lange

2009

Engineering Geology

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“…Owing to difficulties of accessing rocks deep within volcanoes, most previous studies estimated edifice rock strength from surface or borehole samples, and they commonly focused on rocks that were progressively weakened by acid sulfate-argillic hydrothermal alteration (Watters et al 2000;Hürlimann et al 2001;Thomas et al 2004;Zimbelman et al 2004;Moon et al 2005; Thompson et al 2008) and thereby promoted edifice instability (Lopez and Williams 1993;Reid et al 2001 weaken edifice rocks (Voight et al 1983;Donnadieu et al 2001), but they did not examine its ramifications.…”

Section: Introductionmentioning

confidence: 98%

Volcano collapse promoted by progressive strength reduction: new data from Mount St. Helens

et al. 2010

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Rock shear strength plays a fundamental role in volcano flank collapse, yet pertinent data from modern collapse surfaces are rare. Using samples collected from the inferred failure surface of the massive 1980 collapse of Mount St. Helens (MSH), we determined rock shear strength via laboratory tests designed to mimic conditions in the pre-collapse edifice. We observed that the 1980 failure shear surfaces formed primarily in pervasively shattered older dome rocks; failure was not localized in sloping volcanic strata or in weak, hydrothermally altered rocks. Our test results show that rock shear strength under large confining stresses is reduced ∼20% as a result of large quasi-static shear strain, as preceded the 1980 collapse of MSH. Using quasi-3D slope-stability modeling, we demonstrate that this mechanical weakening could have provoked edifice collapse, even in the absence of transiently elevated pore-fluid pressures or earthquake ground shaking. Progressive strength reduction could promote collapses at other volcanic edifices.

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“…For stability and rockfall analysis, their local orientation, as well as joint spacing is of high relevance. It is expected that due to cooling processes (DeGraff and Aydin, 1993), generally a sub-horizontal and two orthogonal sub-vertical joint faces should have developed in the lava flows (Moon et al, 2005). Figure 7b shows that it is possible to identify all of them from the point cloud data.…”

Section: Structural Analysismentioning

confidence: 92%

Use of terrestrial laser scanning for engineering geological applications on volcanic rock slopes – an example from Madeira island (Portugal)

Nguyen

Fernández-Steeger

Wiatr

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract. This study focuses on the adoption of a modern, widely-used Terrestrial Laser Scanner (TLS) application to investigate volcanic rock slopes in Ribeira de João Gomes valley (Funchal, Madeira island). The TLS data acquisition in May and December 2008 provided information for a characterization of the volcanic environment, detailed structural analysis and detection of potentially unstable rock masses on a slope. Using this information, it was possible to determine specific parameters for numerical rockfall simulations such as average block size, shape or potential sources. By including additional data, such as surface roughness, the results from numerical rockfall simulations allowed us to classify different hazardous areas based on run-out distances, frequency of impacts and related kinetic energy. Afterwards, a monitoring of hazardous areas can be performed in order to establish a rockfall inventory.

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Geotechnical characterisation of stratocone crater wall sequences, White Island Volcano, New Zealand

Cited by 60 publications

References 37 publications

Geomorphic development of White Island Volcano based on slope stability modelling

Geomorphic development of White Island Volcano based on slope stability modelling

Volcano collapse promoted by progressive strength reduction: new data from Mount St. Helens

Use of terrestrial laser scanning for engineering geological applications on volcanic rock slopes – an example from Madeira island (Portugal)

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