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1 Correction to: Pure Appl. Geophys. https://doi.org/10.1007/s00024-020-02637-3
The publication of this article unfortunately contained a mistake. There was an error in Eq. 5. The corrected equation is given below.
$$ z = \frac{{M_{1} - M_{2} }}{{\sqrt {\frac{{S_{1}^{2} }}{{n_{1} }} + \frac{{S_{2}^{2} }}{{n_{2} }}} }} $$
The original article has been corrected.
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Li, Y., Chen, X. Correction to: Variations in Apparent Stress and b Value Preceding the 2010 Mw8.8 Bio-Bío, Chile Earthquake. Pure Appl. Geophys. 178, 4289 (2021). https://doi.org/10.1007/s00024-021-02863-3
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DOI: https://doi.org/10.1007/s00024-021-02863-3