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

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

Kereszturi, Gabor (author): Massey Univ, Sch Agr & Environm, Volcan Risk Solut, Palmerston North, New Zealand.

Heap, Michael (author): Univ Strasbourg, Inst Terre & Environm Strasbourg, CNRS, UMR 7063, 5 rue Descartes, F-67084 Strasbourg, France.;Inst Univ France IUF, Paris, France.

Schaefer, Lauren N. (author): US Geol Survey, Geol Hazards Sci Ctr, 1711 Illinois St, Golden, CO 80401 USA.

Darmawan, Herlan (author): Univ Gadjah Mada, Fac Math & Nat Sci, Dept Phys, Yogyakarta, Indonesia.

Deegan, Frances (author): Uppsala universitet,Naturresurser och hållbar utveckling

Kennedy, Ben (author): Univ Canterbury, Geol Sci, Christchurch, New Zealand.

Komorowski, Jean-Christophe (author): Univ Paris, Inst Phys Globe Paris, CNRS, Paris, France.

Mead, Stuart (author): Massey Univ, Sch Agr & Environm, Volcan Risk Solut, Palmerston North, New Zealand.

Rosas-Carbajal, Marina (author): Univ Paris, Inst Phys Globe Paris, CNRS, Paris, France.

Ryan, Amy (author): Univ Minnesota, Dept Earth & Environm Sci, Minneapolis, MN 55455 USA.

Troll, Valentin R. (author): Uppsala universitet,Naturresurser och hållbar utveckling

Villeneuve, Marlene (author): Univ Leoben, Subsurface Engn, Leoben, Austria.

Walter, Thomas R. (author): GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany.

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Massey Univ, Sch Agr & Environm, Volcan Risk Solut, Palmerston North, New Zealand Univ Strasbourg, Inst Terre & Environm Strasbourg, CNRS, UMR 7063, 5 rue Descartes, F-67084 Strasbourg, France.;Inst Univ France IUF, Paris, France. (creator_code:org_t)

Elsevier, 2023
2023
English.
In: Earth and Planetary Science Letters. - : Elsevier. - 0012-821X .- 1385-013X. ; 602

Related links:: https://doi.org/10.1...; show more...; https://uu.diva-port... (primary) (Raw object); https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

Volcano 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 Soufriere 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. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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By the author/editor: Kereszturi, Gabo ...; Heap, Michael; Schaefer, Lauren ...; Darmawan, Herlan; Deegan, Frances; Kennedy, Ben; show more...; Komorowski, Jean ...; Mead, Stuart; Rosas-Carbajal, ...; Ryan, Amy; Troll, Valentin ...; Villeneuve, Marl ...; Walter, Thomas R ...; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geology

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By the university: Uppsala University

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

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