Articles | Volume 10, issue 4
Solid Earth, 10, 1385–1395, 2019
https://doi.org/10.5194/se-10-1385-2019
Solid Earth, 10, 1385–1395, 2019
https://doi.org/10.5194/se-10-1385-2019

Research article 21 Aug 2019

Research article | 21 Aug 2019

What happens to fracture energy in brittle fracture? Revisiting the Griffith assumption

Timothy R. H. Davies et al.

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AR by Tim Davies on behalf of the Authors (25 Jul 2019)  Author's response    Manuscript
ED: Publish as is (25 Jul 2019) by David Healy
ED: Publish as is (25 Jul 2019) by Susanne Buiter(Executive Editor)
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Short summary
Griffith (1921) assumed that energy used to create new surface area by breaking intact rock immediately becomes surface energy which is not available for further breakage. Our lab data disprove this assumption; we created much more new surface area, 90 % on submicron fragments, than the energy involved should allow. As technology allows ever smaller fragments to be measured, continued use of the Griffith assumption will lead to incorrect energy budgets for earthquakes and rock avalanches.