Figure 7
From: Pre-earthquake anomaly extraction from borehole strain data based on machine learning
Accumulated results of abnormal days of boreholes strain data in Guza station. (A) is the cumulative result of abnormal days during the Wenchuan earthquake, and the red and blue lines represent the results of the sigmoidal fitting; (B) is the cumulative result of abnormal days during the Lushan earthquake, and the red and blue lines represent the results of the sigmoidal fitting.
