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Cooling-dominated cracking in thermally stressed volcanic rocks

Browning, J; Meredith, P; Gudmundsson, A; (2016) Cooling-dominated cracking in thermally stressed volcanic rocks. Geophysical Research Letters , 43 (16) pp. 8417-8425. 10.1002/2016GL070532. Green open access

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Abstract

Most studies of thermally induced cracking in rocks have focused on the generation of cracks formed during heating and thermal expansion. Both the nature and the mechanism of crack formation during cooling are hypothesized to be different from those formed during heating. We present in situ acoustic emission data recorded as a proxy for crack damage evolution in a series of heating and cooling experiments on samples of basalt and dacite. Results show that both the rate and the energy of acoustic emission are consistently much higher during cooling than during heating. Seismic velocity comparisons and crack morphology analysis of our heated and cooled samples support the contemporaneous acoustic emission data and also indicate that thermal cracking is largely isotropic. These new data are important for assessing the contribution of cooling-induced damage within volcanic structures and layers such as dikes, sills, and lava flows.

Type: Article
Title: Cooling-dominated cracking in thermally stressed volcanic rocks
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/2016GL070532
Publisher version: http://dx.doi.org/10.1002/2016GL070532
Language: English
Additional information: Copyright © 2016 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: thermal cracking; acoustic emission; thermal stress; cooling joints
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1508323
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