Depth-constrained cluster analysis

• Find minimum d, say dj

• Join xj and xj+1 (new xj)

• Recompute dj, dj-1

• Do it again...

Gill et al., 1993, Numerical zonation of log suites and logfacies recognition by multivariate clustering, AAPG Bulletin v. 77, no. 10, p. 1781-1791.

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