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We measured the porosity and permeability of a porous volcanic rock during deformation in the brittle and ductile regimes. In the brittle regime, permeability decreases by a factor of 2\u20136 up to the peak stress due the closure of narrow pore throats but, following shear fracture formation, remains approximately constant as strain is accommodated by sliding on the fracture. In the ductile regime, permeability continually decreases, by up to an order of magnitude, as a function of strain. Although compaction in the ductile regime is localized, permeability is not reduced substantially due to the tortuous and diffuse nature of the compaction bands, the geometry of which was also influenced by a pore shape preferred orientation. Although the evolution of the permeability of the studied porous volcanic rock in the brittle and ductile regimes is qualitatively similar to that for porous sedimentary rocks, the porosity sensitivity exponent of permeability in the elastic regime is higher than found previously for porous sedimentary rocks. This exponent decreases during shear\u2010enhanced compaction toward a value theoretically derived for granular media, suggesting that the material is effectively granulating. Indeed, cataclastic pore collapse evolves the microstructure to one that is more granular. Understanding how permeability can evolve in a volcanic edifice will improve the accuracy of models designed to assist volcano monitoring and volcanic hazard mitigation.<\/jats:p>","DOI":"10.1029\/2022jb024600","type":"journal-article","created":{"date-parts":[[2022,6,16]],"date-time":"2022-06-16T18:18:16Z","timestamp":1655403496000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["The Permeability of Porous Volcanic Rock Through the Brittle\u2010Ductile Transition"],"prefix":"10.1029","volume":"127","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4748-735X","authenticated-orcid":false,"given":"Michael J.","family":"Heap","sequence":"first","affiliation":[{"name":"CNRS Institut Terre et Environnement de Strasbourg UMR 7063 Universit\u00e9 de Strasbourg  Strasbourg France"},{"name":"Institut Universitaire de France (IUF)  Paris France"},{"name":"Laboratory of Experimental Rock Mechanics Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne  Lausanne Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4628-6879","authenticated-orcid":false,"given":"Gabriel G.","family":"Meyer","sequence":"additional","affiliation":[{"name":"Laboratory of Experimental Rock Mechanics Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne  Lausanne Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2324-9290","authenticated-orcid":false,"given":"Corentin","family":"No\u00ebl","sequence":"additional","affiliation":[{"name":"Laboratory of Experimental Rock Mechanics Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne  Lausanne Switzerland"},{"name":"Dipartimento di Scienze della Terra La Sapienza Universit\u00e0 di Roma  Rome Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5341-208X","authenticated-orcid":false,"given":"Fabian B.","family":"Wadsworth","sequence":"additional","affiliation":[{"name":"Earth Sciences Durham University  Durham UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Baud","sequence":"additional","affiliation":[{"name":"CNRS Institut Terre et Environnement de Strasbourg UMR 7063 Universit\u00e9 de Strasbourg  Strasbourg France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7402-8263","authenticated-orcid":false,"given":"Marie E. 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