Correction to: Rock Mechanics and Rock Engineering 54, 5483–5492 (2021) https://doi.org/10.1007/s00603-021-02420-3


In the original version of this article, Eq. (1) has an incorrect form. The corrected Eq. (1) is:

$$ M = \lg [x^{3} \Delta \sigma /\kappa_{0} ]^{2/3} - 6.07. $$
(1)

None of the results of this publication were affected by this typo.