Triggering processes in rock fracture

Jörn Davidsen, Grzegorz Kwiatek, Elli-Maria Christodoulos Charalampidou, Thomas Goebel, Sergei A. Stanchits, Marc Rück, Georg H. Dresen

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Abstract

We study triggering processes in tri-axial compression experiments under constant displacement rate on sandstone and granite samples using spatially located acoustic emission events and their focal mechanisms. We present strong evidence that event-event triggering plays an important role in the presence of large-scale or macrocopic imperfections while such triggering is basically absent if no significant imperfections are present. In the former case, we recover all established empirical relations of aftershock seismicity including the Gutenberg-Richter relation, a modified version of the Omori-Utsu relation and the productivity relation — despite the fact that the activity is dominated by compaction-type events and triggering cascades have a swarm-like topology. For the Gutenberg- Richter relations, we find that the b -value is smaller for triggered events compared to background events. Moreover, we show that triggered acoustic emission events have a focal mechanism much more similar to their associated trigger than expected by chance.
Original languageEnglish
Article number068501
Number of pages6
JournalPhysical Review Letters
Volume119
Issue number6
Early online date8 Aug 2017
DOIs
Publication statusPublished - 11 Aug 2017

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    Davidsen, J., Kwiatek, G., Charalampidou, E-M. C., Goebel, T., Stanchits, S. A., Rück, M., & Dresen, G. H. (2017). Triggering processes in rock fracture. Physical Review Letters, 119(6), [068501]. https://doi.org/10.1103/PhysRevLett.119.068501