Study on Electric-Magnetic-Acoustic Signal Regularity and Its Correlation during Rock Shear Failure

Figure 7

Correlation coefficient of signals (sample 1). (a) Stress vs. electric signals. (b) AE energy vs. electric signals. (c) Stress vs. EMR energy. (d) AE energy vs. EMR energy.

(a)

(b)

(c)

(d)