  We study the motion of a domain wall on an ultrathin magnetic film using the
magneto-optical Kerr effect (MOKE). At tiny magnetic fields, the wall creeps
only via thermal activation over the pinning centers present in the sample. Our
results show that this creep dynamics is highly intermittent and correlated. A
localized instability triggers a cascade, akin to aftershocks following a large
earthquake, where the pinned wall undergoes large reorganizations in a compact
active region for a few seconds. Surprisingly, the size and shape of these
reorganizations display the same scale-free statistics of the depinning
avalanches in agreement with the quenched Kardar-Parisi-Zhang universality
class.
