1. . []

The difference between the maximum displacement of a wave and the point of no displacement, or the null point. The common symbol for amplitude is a.

See: amplitude anomalyattenuationattributebright spotdilatationdim spotfilterfootprintgainpeakpolarityrarefactionreflection coefficientspectralspectrumsuppressiontime slicetroughtrue-amplitude recoverywaveformwaveletwiggle trace

2. . []

The amount of displacement of a seismic wavelet measured from peak to trough.