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Rupture Energetics in Crustal Rock From Laboratory‐Scale Seismic Tomography

Aben, FM; Brantut, N; Mitchell, TM; David, EC; (2019) Rupture Energetics in Crustal Rock From Laboratory‐Scale Seismic Tomography. Geophysical Research Letters 10.1029/2019gl083040. (In press). Green open access

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Abstract

The energy released during earthquake rupture is partly radiated as seismic waves and mostly dissipated by frictional heating on the fault interface and by off‐fault fracturing of surrounding host rock. Quantification of these individual components is crucial to understand the physics of rupture. We use a quasi‐static rock fracture experiment combined with a novel seismic tomography method to quantify the contribution of off‐fault fracturing to the energy budget of a rupture and find that this contribution is around 3% of the total energy budget and 10% of the fracture energy Gc. The off‐fault dissipated energy changes the physical properties of the rock at the early stages of rupture, illustrated by the 50% drop in elastic moduli of the rock near the fault, and thus is expected to greatly influence later stages of rupture and slip. These constraints are a unique benchmark for calibration of dynamic rupture models.

Type: Article
Title: Rupture Energetics in Crustal Rock From Laboratory‐Scale Seismic Tomography
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2019gl083040
Publisher version: https://doi.org/10.1029/2019gl083040
Language: English
Additional information: Copyright © 2019 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: rupture energetics, laboratory seismology, ultrasonic tomography, fault damage zone, fracture energy
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/10077613
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