Porosity, strength, and alteration – Towards a new volcano stability assessment tool using VNIR-SWIR reflectance spectroscopy

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dc.citation.issueJanuary 2023
dc.citation.volume602
dc.contributor.authorKereszturi G
dc.contributor.authorHeap M
dc.contributor.authorSchaefer LN
dc.contributor.authorDarmawan H
dc.contributor.authorDeegan FM
dc.contributor.authorKennedy B
dc.contributor.authorKomorowski J-C
dc.contributor.authorMead S
dc.contributor.authorRosas-Carbajal M
dc.contributor.authorRyan A
dc.contributor.authorTroll VR
dc.contributor.authorVilleneuve M
dc.contributor.authorWalter TR
dc.contributor.editorPetrone CM
dc.date.accessioned2024-11-14T20:43:11Z
dc.date.available2024-11-14T20:43:11Z
dc.date.issued2023-01-15
dc.description.abstractVolcano slope stability analysis is a critical component of volcanic hazard assessments and monitoring. However, traditional methods for assessing rock strength require physical samples of rock which may be difficult to obtain or characterize in bulk. Here, visible to shortwave infrared (350–2500 nm; VNIR–SWIR) reflected light spectroscopy on laboratory-tested rock samples from Ruapehu, Ohakuri, Whakaari, and Banks Peninsula (New Zealand), Merapi (Indonesia), Chaos Crags (USA), Styrian Basin (Austria) and La Soufrière de Guadeloupe (Eastern Caribbean) volcanoes was used to design a novel rapid chemometric-based method to estimate uniaxial compressive strength (UCS) and porosity. Our Partial Least Squares Regression models return moderate accuracies for both UCS and porosity, with R2 of 0.43–0.49 and Mean Absolute Percentage Error (MAPE) of 0.2–0.4. When laboratory-measured porosity is included with spectral data, UCS prediction reaches an R2 of 0.82 and MAPE of 0.11. Our models highlight that the observed changes in the UCS are coupled with subtle mineralogical changes due to hydrothermal alteration at wavelengths of 360–438, 532–597, 1405–1455, 2179–2272, 2332–2386, and 2460–2490 nm. These mineralogical changes include mineral replacement, precipitation hydrothermal alteration processes which impact the strength of volcanic rocks, such as mineral replacement, precipitation, and/or silicification. Our approach highlights that spectroscopy can provide a first order assessment of rock strength and/or porosity or be used to complement laboratory porosity-based predictive models. VNIR-SWIR spectroscopy therefore provides an accurate non-destructive way of assessing rock strength and alteration mineralogy, even from remote sensing platforms.
dc.description.confidentialfalse
dc.identifier.citationKereszturi G, Heap M, Schaefer LN, Darmawan H, Deegan FM, Kennedy B, Komorowski JC, Mead S, Rosas-Carbajal M, Ryan A, Troll VR, Villeneuve M, Walter TR. (2023). Porosity, strength, and alteration – Towards a new volcano stability assessment tool using VNIR-SWIR reflectance spectroscopy. Earth and Planetary Science Letters. 602. January 2023.
dc.identifier.doi10.1016/j.epsl.2022.117929
dc.identifier.eissn1385-013X
dc.identifier.elements-typejournal-article
dc.identifier.issn0012-821X
dc.identifier.number117929
dc.identifier.piiS0012821X22005659
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/72007
dc.languageEnglish
dc.publisherElsevier B V, Amsterdam
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S0012821X22005659
dc.relation.isPartOfEarth and Planetary Science Letters
dc.rights(c) 2022 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectuniaxial compressive strength
dc.subjectadvanced argillic alteration
dc.subjectdebris avalanche
dc.subjectphyllosilicates
dc.subjecthyperspectral remote sensing
dc.subjecthydrothermal alteration
dc.titlePorosity, strength, and alteration – Towards a new volcano stability assessment tool using VNIR-SWIR reflectance spectroscopy
dc.typeJournal article
pubs.elements-id458429
pubs.organisational-groupOther
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