Figure 5

Plots of the intrinsic mode components and residuals. (a) At the surface of the inlet section of the right cave (b) At the rock surrounding the vault of the YK68 + 376 section.

Plots of the intrinsic mode components and residuals. (a) At the surface of the inlet section of the right cave (b) At the rock surrounding the vault of the YK68 + 376 section.