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Triggering Processes in Rock Fracture
- We study triggering processes in triaxial compression experiments under a 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 swarmlike 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.
Verfasserangaben: | Joern Davidsen, Grzegorz KwiatekORCiD, Elli-Maria CharalampidouORCiD, Thomas Goebel, Sergei Stanchits, Marc Rueck, Georg DresenORCiDGND |
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DOI: | https://doi.org/10.1103/PhysRevLett.119.068501 |
ISSN: | 0031-9007 |
ISSN: | 1079-7114 |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/28949624 |
Titel des übergeordneten Werks (Englisch): | Physical review letters |
Verlag: | American Physical Society |
Verlagsort: | College Park |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2017 |
Erscheinungsjahr: | 2017 |
Datum der Freischaltung: | 20.04.2020 |
Band: | 119 |
Seitenanzahl: | 8 |
Fördernde Institution: | Chemical Sciences, Geosciences, and Biosciences division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy (DOE) [DE-FG02-04ER15571]; DOE; Alexander von Humboldt foundation through the Feodor Lynen program |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Peer Review: | Referiert |