Data from: Rupture Termination in Laboratory-Generated Earthquakes
Ke, Chun-Yu; McLaskey, Gregory C.; Kammer, David S.
These data are from Laboratory Earthquake Experiments from the Cornell 3 m apparatus in support of the following research: Loading a 3-meter granite slab containing a saw-cut simulated fault, we generated rupture events that spontaneously nucleate, propagate, and arrest before reaching the ends of the sample. These rupture events have a slip distribution that varies along the fault and make them more similar to natural earthquakes than standard stick-slip events that rupture the entire sample. Through LEFM (Linear Elastic Fracture Mechanics), we showed how the balance between energy release rate and fracture energy governs the termination of a rupture. In our experiments, fracture energy is essentially constant compared to the orders-of-magnitude variations in energy release rate so ruptures terminate because they run out of available strain energy. The utility of the model for both 3-m rock experiments and 200-mm PMMA experiments, and the similarity of fracture energy coefficient between the two materials, verifies the adequacy of PMMA as an analog to crustal rock in this context. Finally, the LEFM-based model provides a framework for linking friction properties and on-fault stress conditions to observable earthquake sequences
This work was sponsored by USGS Earthquake hazards grant G18AP00010 and National Science Foundation grants EAR-1645163, EAR-1763499, and EAR-1847139.
Linear Elastic Fracture Mechanics; Laboratory Earthquake; Stick-Slip; Dynamic Rupture; Rupture Arrest; Fracture Energy
Ke, C.-Y., McLaskey, G. C., Kammer, D. S. (2018) Rupture Termination in Laboratory-Generated Earthquakes. Geophysical Research Letters 45(23):12784-12792. https://doi.org/10.1029/2018GL080492
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