  Dynamic mechanical analysis (DMA) measurements as a function of temperature,
frequency, and dynamic force amplitude are used to perform a detailed study of
the domain wall motion in LaAlO3. In previous DMA measurements Harrison et
al.[Phys. Rev. B69,144101(2004)] found evidence for dynamic phase transitions
of ferroelastic domain walls in LaAlO3. In the present work we focus on the
creep-to-relaxation region of domain wall motion using two complementary
methods. We determine, in addition to dynamic susceptibility data, waiting time
distributions of strain jerks during slowly increasing stress. The present
dynamic susceptibility data can be well fitted with a power law, where a
crossover from stochastic DW motion to the pinned regime is well described
using the scaling function of Fedorenko et al.[Phys. Rev. B70, 224104(2004)].
