Assessing the role of hydrothermal alteration on volcano morphology, instability, and unpredictable volcanic hazards

Deliverables

Publications

Phreatic eruptions at Whakaari Volcano driven by hydrothermal mineralisation and magmatic gas input

Author(s): Sophie C. Pearson-Grant, Michael J. Heap, Adrian E. Croucher
Published in: Communications Earth & Environment, Issue 6, 2025, ISSN 2662-4435
Publisher: Springer Science and Business Media LLC
DOI: 10.1038/S43247-025-03057-8

Origin and Affinities of the Malmberget Iron Oxide-Apatite Deposit, Northern Sweden: Insights From Magnetite Chemistry and Fe-O Isotopes

Author(s): Jens S. Henriksson, Valentin R. Troll, Ellen Kooijman, Ilya Bindeman, Tomas Naeraa, Tobias E. Bauer
Published in: Earth Science, Systems and Society, Issue 4, 2025, ISSN 2634-730X
Publisher: Geological Society of London
DOI: 10.3389/ESSS.2024.10126

Compaction and Permeability Evolution of Tuffs From Krafla Volcano (Iceland)

Author(s): Michael J. Heap, Kamal Bayramov, Gabriel G. Meyer, Marie E. S. Violay, Thierry Reuschlé, Patrick Baud, H. Albert Gilg, Claire E. Harnett, Alexandra R. L. Kushnir, Francesco Lazari, Anette K. Mortensen
Published in: Journal of Geophysical Research: Solid Earth, Issue 129, 2024, ISSN 2169-9313
Publisher: American Geophysical Union (AGU)
DOI: 10.1029/2024JB029067

Hydrothermal weakening and slope instability at Vulcano (Italy) analyzed using drones and in-situ strength measurements

Author(s): Benjamin F. De Jarnatt, Thomas R. Walter, Michael J. Heap, Daniel Müller, Antonino Fabio Pisciotta
Published in: Communications Earth & Environment, Issue 7, 2026, ISSN 2662-4435
Publisher: Springer Science and Business Media LLC
DOI: 10.1038/S43247-025-03014-5

Volcanic crisis reveals coupled magma system at Santorini and Kolumbo

Author(s): Marius P. Isken, Jens Karstens, Paraskevi Nomikou, Michelle Maree Parks, Vincent Drouin, Eleonora Rivalta, Gareth J. Crutchley, Mahmud Haghshenas Haghighi, Emilie E. E. Hooft, Simone Cesca, Thomas R. Walter, Sebastian Hainzl, Joachim Saul, Dimitris Anastasiou, Kostas Raptakis, Nikolai M. Shapiro, Jannes Münchmeyer, Quentin Higueret, Jean Soubestre, Florent Brenguier, Rebeckah S. Hufstetler, Kaisa R. Autumn, Maria Tsakiri, Dietrich Lange, Heidrun Kopp, Morelia Urlaub, María Blanch Jover, Jonas Preine, Christian Hübscher, Mahdi Motagh, Daniel Müller, Torsten Dahm, Christian Berndt
Published in: Nature, Issue 645, 2025, ISSN 0028-0836
Publisher: Springer Science and Business Media LLC
DOI: 10.1038/S41586-025-09525-7

Fracture dynamics and topographic controls at Mount Thorbjörn during the Svartsengi 2023–2024 volcanic unrest, Iceland

Author(s): Maria Hurley, Nicolas Oestreicher, Alina V. Shevchenko, Gregory P. De Pascale, Magnús T. Gudmundsson, Egill Á. Gudnason, Gylfi P. Hersir, Benjamin F. De Jarnatt, Alea Joachim, Joël Ruch, Fabio L. Bonali, Thomas R. Walter
Published in: Journal of Volcanology and Geothermal Research, Issue 466, 2026, ISSN 0377-0273
Publisher: Elsevier BV
DOI: 10.1016/J.JVOLGEORES.2025.108407

Effects of Regional Stress State and Pore Fluid Pressure on the Onset and Style of Caldera Collapse

Author(s): Matías A. Villarroel, Martin P. J. Schöpfer, John Browning, Eoghan P. Holohan, Claire E. Harnett, Carlos J. Marquardt, Pamela P. Jara
Published in: Journal of Geophysical Research: Solid Earth, Issue 130, 2025, ISSN 2169-9313
Publisher: American Geophysical Union (AGU)
DOI: 10.1029/2024JB031054

The thermal properties of submarine rhyolite lavas from Havre volcano (Kermadec arc, Pacific Ocean)

Author(s): Rebecca Carey, Michael Heap, Samuel Mitchell, Fabian Wadsworth
Published in: Volcanica, Issue 8, 2025, ISSN 2610-3540
Publisher: Volcanica
DOI: 10.30909/VOL/JTFG1051

Post-failure deformation mode switching in volcanic rock

Author(s): Jamie I. Farquharson, Michael J. Heap, Lucille Carbillet, Patrick Baud
Published in: Royal Society Open Science, Issue 11, 2024, ISSN 2054-5703
Publisher: The Royal Society
DOI: 10.1098/RSOS.240792

Spatial distribution of alteration and strength in a lava dome: Implications for large-scale volcano stability modelling

Author(s): Agata Poganj, Michael J. Heap, Patrick Baud
Published in: Journal of Volcanology and Geothermal Research, Issue 463, 2025, ISSN 0377-0273
Publisher: Elsevier BV
DOI: 10.1016/J.JVOLGEORES.2025.108344

The thermal properties of submarine rhyolite lavas from Havre volcano (Kermadec arc, Pacific Ocean)

Author(s): Rebecca Carey, Michael Heap, Samuel Mitchell, Fabian Wadsworth
Published in: Volcanica, Issue 8, 2025, ISSN 2610-3540
Publisher: Volcanica
DOI: 10.30909/VOL/JTFG1051

Microbial dissolution of Gran Canaria lapilli in small-scale flow through columns: carbon dioxide removal potential

Author(s): Thomas Corbett, Elisabeth Odelius, Tora Uebel, Tove Jonsson, Abhijeet Singh, Sara Vicca, Mathilde Hagens, Tetyana Budnyak, Oleg Tkachenko, Reinaldy Poetra, Jens Hartmann, Ivan A. Janssens, Harun Niron, Michiel Van Tendeloo, Siegfried E. Vlaeminck, Anna Neubeck
Published in: npj Materials Degradation, Issue 9, 2025, ISSN 2397-2106
Publisher: Springer Science and Business Media LLC
DOI: 10.1038/S41529-025-00611-9

Spatio-temporal evolution of the fumarolic field of La Fossa cone (Vulcano Island, Italy) in 2021–2024

Author(s): Simone Lentini, Marcello Bitetto, Luciano Curcio, Malte Seefeld, Angelo Vitale, Pierfrancesco Dellino, Daniel Müller, Roberto Sulpizio, Thomas R. Walter, Alessandro Aiuppa
Published in: Volcanica, Issue 8, 2025, ISSN 2610-3540
Publisher: Volcanica
DOI: 10.30909/VOL/TAYR9210

Insights into the internal structure and mechanical behavior of Copahue volcano (Argentina-Chile)

Author(s): Matías Tramontini, Marina Rosas-Carbajal, Michael J. Heap, Pascale Besson, Jacques Marteau, Sebastian Garcia, Fabio I. Zyserman
Published in: Journal of Volcanology and Geothermal Research, 2026, ISSN 0377-0273
Publisher: Elsevier BV
DOI: 10.1016/J.JVOLGEORES.2026.108644

Hyperspectral mapping of density, porosity, stiffness, and strength in hydrothermally altered volcanic rocks

Author(s): Samuel T. Thiele, Gabor Kereszturi, Michael J. Heap, Andréa de Lima Ribeiro, Akshay V. Kamath, Maia Kidd, Matías Tramontini, Marina Rosas-Carbajal, Richard Gloaguen
Published in: Solid Earth, Issue 16, 2025, ISSN 1869-9529
Publisher: Copernicus GmbH
DOI: 10.5194/SE-16-1249-2025

Deep crustal assimilation during the 2021 Fagradalsfjall Fires, Iceland

Author(s): James M. D. Day, Savannah Kelly, Valentin R. Troll, William M. Moreland, Geoffrey W. Cook, Thor Thordarson
Published in: Nature, Issue 632, 2024, ISSN 0028-0836
Publisher: Springer Science and Business Media LLC
DOI: 10.1038/S41586-024-07750-0

From alteration to avalanche: A 3D framework for exploring hydrothermal weakening of lava domes

Author(s): K.D. Ní Nualláin, C.E. Harnett, A. Hrysiewicz, M.J. Heap, T.R. Walter, M. Rosas-Carbajal
Published in: Journal of Volcanology and Geothermal Research, Issue 472, 2026, ISSN 0377-0273
Publisher: Elsevier BV
DOI: 10.1016/J.JVOLGEORES.2026.108566

The influence of temperature (up to 120 °C) on the thermal conductivity of variably porous andesite

Author(s): Michael J. Heap, Gunel Alizada, David E. Jessop, Ben M. Kennedy, Fabian B. Wadsworth
Published in: Journal of Volcanology and Geothermal Research, Issue 452, 2024, ISSN 0377-0273
Publisher: Elsevier BV
DOI: 10.1016/J.JVOLGEORES.2024.108140

Anatomy of a fumarole field: drone remote-sensing and petrological approaches reveal the degassing and alteration structure at La Fossa cone, Vulcano, Italy

Author(s): Daniel Müller, Thomas R. Walter, Valentin R. Troll, Jessica Stammeier, Andreas Karlsson, Erica de Paolo, Antonino Fabio Pisciotta, Martin Zimmer, Benjamin De Jarnatt
Published in: Solid Earth, Issue 15, 2024, ISSN 1869-9529
Publisher: Copernicus GmbH
DOI: 10.5194/SE-15-1155-2024

Influence of cristobalite and diktytaxitic textures on the physical properties of submarine rhyolite lavas from Havre volcano (Kermadec volcanic arc, Pacific Ocean)

Author(s): Michael J. Heap, Samuel J. Mitchell, Rebecca J. Carey, Alexandra R.L. Kushnir
Published in: Journal of Volcanology and Geothermal Research, Issue 466, 2025, ISSN 0377-0273
Publisher: Elsevier BV
DOI: 10.1016/J.JVOLGEORES.2025.108392

The influence of hydrothermal alteration on permeability: A field study

Author(s): Agata Poganj, Michael J. Heap, Patrick Baud
Published in: Journal of Volcanology and Geothermal Research, Issue 473, 2026, ISSN 0377-0273
Publisher: Elsevier BV
DOI: 10.1016/J.JVOLGEORES.2026.108574

Origin of Silicic Magmatism at the Katla Volcanic Complex, South Iceland

Author(s): Valentin R. Troll, Frances M. Deegan, Jussi S. Heinonen, Caroline Svanholm, Chris Harris, Christian M. Lacasse, Harri Geiger, Agata Poganj, Louise Thomas, Malin Andersson, Romain Meyer, Thorvaldur Thordarson
Published in: Geochemistry, Geophysics, Geosystems, Issue 26, 2025, ISSN 1525-2027
Publisher: American Geophysical Union (AGU)
DOI: 10.1029/2025GC012319

Petrophysical properties of hydrothermally-altered pyroclastic deposits from Deception Island (Bransfield Strait, Antarctica)

Author(s): Michael J. Heap, Adelina Geyer, Jasmine Dibben, James Hickey, Guillem Gisbert, Oriol Vilanova-Pagès, Jordi Ibañez-Insa, Antonio Polo-Sánchez, Santiago Giralt, Maëlys Moulin, Antonio M. Álvarez-Valero
Published in: Journal of Volcanology and Geothermal Research, Issue 466, 2025, ISSN 0377-0273
Publisher: Elsevier BV
DOI: 10.1016/J.JVOLGEORES.2025.108399

Origin and Affinities of the Malmberget Iron Oxide-Apatite Deposit, Northern Sweden: Insights From Magnetite Chemistry and Fe-O Isotopes

Author(s): Jens S. Henriksson, Valentin R. Troll, Ellen Kooijman, Ilya Bindeman, Tomas Naeraa, Tobias E. Bauer
Published in: Earth Science, Systems and Society, Issue 4, 2024, ISSN 2634-730X
Publisher: Geological Society of London
DOI: 10.3389/ESSS.2024.10126

Applications and implications of monitoring surface hydrothermal deposits at Lastarria Volcano, Chile, using multispectral satellite data and cloud computing

Author(s): Guosheng Gao, Thomas R. Walter, Daniel Müller, Pouria Marzban, Simon Plank
Published in: Geothermics, Issue 127, 2025, ISSN 0375-6505
Publisher: Elsevier BV
DOI: 10.1016/J.GEOTHERMICS.2025.103255

Control of pore geometry on the strength, elastic anisotropy and acoustic emission output of vesicular lavas from Nevados de Chillán, Chile

Author(s): Fernanda Merchán, John Browning, Gloria Arancibia, David Healy, Valentina Mura, Camila Pineda, Michael J. Heap, Patrick Baud, Jorge E. Romero, Matias Clunes, Luis Felipe Orellana, Diego Morata
Published in: Bulletin of Volcanology, Issue 88, 2026, ISSN 1432-0819
Publisher: Springer Science and Business Media LLC
DOI: 10.1007/S00445-026-01968-8

Long-term deformation of coastal volcanoes in SE-Asia: linking displacement rates, volcanic activity and flank instabilities

Author(s): Edgar U. Zorn, Falk Amelung, Francesco Massimetti, Marco Laiolo, Diego Coppola, Thomas R. Walter, Yan Lavallée, Herlan Darmawan
Published in: Bulletin of Volcanology, Issue 88, 2026, ISSN 1432-0819
Publisher: Springer Science and Business Media LLC
DOI: 10.1007/S00445-025-01915-Z

Hyperspectral mapping of density, porosity, stiffness, and strength in hydrothermally altered volcanic rocks

Author(s): Samuel T. Thiele; Gabor Kereszturi; Michael J. Heap; Andréa de Lima Ribeiro; Akshay Kamath; Maia Kidd; Matías Tramontini; Marina Rosas-Carbajal; Richard Gloaguen
Published in: eISSN:, 2025
DOI: 10.5194/EGUSPHERE-2025-1904

Buried hydrothermal alteration zones create mechanical weaknesses within lava domes; the case of Merapi volcano, Central Java, Indonesia

Author(s): Valentin R. Troll, Thomas R. Walter, Herlan Darmawan, Michael J. Heap, Claire E. Harnett, Frances M. Deegan, Nadhirah Seraphine, Harri Geiger, Daniel Müller
Published in: GeoSaxonia 2024, 2024
Publisher: DGGV
DOI: 10.48380/YM4P-P569

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