**1. n. [Geophysics]**

A measure of the similarity of two seismic traces.

**See:**
correlation,
phantom,
seismic trace,
semblance

**3. n. [Geophysics]**

The similarity of two mathematical functions as evaluated in the frequency domain.

**See:**
correlation

**4. n. [Geophysics]**

A quantitative assessment of the similarity of three or more functions, also called semblance.