  Characterizing the interaction between water and microscopic defects is one
of the long-standing challenges in understanding a broad range of cracking
processes. Different physical aspects of microscopic events, driven or
influenced by water, have been extensively discussed in atomistic calculations
but have not been accessible in microscale experiments. Through the analysis of
the emitted noises during the evolution of individual, dynamic microcracking
events, we show that the onset of a secondary instability known as hybrid
events occurs during the fast healing phase of microcracking, which leads to
(local) sudden increase of pore water pressure in the process zone, inducing a
secondary instability, which is followed by a fast-locking phase on the
microscopic faults (pulse-like rupture).
