Figure 4
From: Pre-earthquake anomaly extraction from borehole strain data based on machine learning
Areal strain data (\(S_{a}\)) and shear strain data (\(S_{13}\) and \(S_{24}\)). (A) is the borehole strain data of Guza Station from 2007 to 2008, the dashed line represents the moment of the Wenchuan earthquake occurred; (B) is the borehole strain data of Guza Station from 2011 to 2013, and the dashed line represents the moment of the Lushan earthquake occurred.
