An Effective Method for Borehole Imaging of Buried Tunnels

Figure 5

LSM imaging of the tunnel in cluttered scenario. (a) Cross-hole measurement configuration; (b) surface moving array measurement configuration. Results achieved with borehole measurement configuration: (c) normalized logarithmic plot of the LSM indicator; (d) binarized LSM indicator with threshold 0.75; (e) binarized LSM 3D indicator in the whole region. Results achieved with surface measurement configuration: (f) normalized logarithmic plot of the LSM indicator; (g) binarized LSM indicator with threshold 0.75; (h) binarized LSM 3D indicator in the whole region.

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