Table 1.

Comparison of exponents observed in M. xanthus to other systems

	Crystal deformation	Earthquake dynamics	M. xanthus behavior	Mean field value
Slip displacement, τ	1.4–1.6	1.3–2.5	1.9–2.2	3/2
Slip duration, α	—	∼2	2.2–2.6	2
Power spectrum of velocity, 1/(σνz)	2	1.8–3.4	1.5–1.8	2
Exponent relation: |(τ + σνz − 1)/(σνz) – α|	—	—	0.2–0.5	0

Observed exponents are consistent with mean field theoretical values and with exponents previously observed in other crackling noise systems (12, 29–33).