Further reading:
Nielsen, S., Taddeucci, J., & Vinciguerra, S. (2010).
Experimental observation of stick-slip instability fronts.
Geophysical Journal International, 180, 697-702. https://doi.org/10.1111/j.1365-246x.2009.04444.x
Schubnel, A., Nielsen, S., Taddeucci, J., Vinciguerra, S., & Rao, S. (2011).
Photo-acoustic study of subshear and supershear ruptures in the laboratory.
Earth and Planetary Science Letters, 308(3-4), 424-432.
https://doi.org/10.1016/j.epsl.2011.06.013