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Here, we analyze in natural time $\chi$, the slow propagation of amacroscopic crack in brittle heterogeneous materials through sudden jumps andenergy release events which are power law distributed with universal exponents.This macroscopic crack growth is currently believed to exhibit similarcharacteristics with the seismicity associated with earthquakes. Consideringthat the crack front is self affine and exhibits Family-Vicsek universalscaling, we show that the variance $\kappa_1 (\equiv\langle \chi^2\rangle-\langle \chi \rangle^2)$ of natural time is equal to 0.0686, which almostcoincides with the value $\kappa_1\approx 0.07$ obtained from the seismicitypreceding major earthquakes. This sheds light on the determination of theoccurrence time of an impending mainshock.

Macroscopic crack propagation in brittle heterogeneous materials analyzed in Natural Time