...
The value of the amplitude spectrum at a specific frequency calculated by as Short Time Fourier Transform.
User-defined Function
Lets the user specify a mathematical function of the original seismic and the position of the sample in question.
For example you could use the function "abs(s)" to find the absolute value of the seismic.
From the Variables drop-down list you can choose from different variables such as I, inline trace position. Hoovering over a variable name brings up a description.
From the Functions drop-down list you can choose from many different mathematical functions such as abs(). Hoovering over a function name brings up a description.
Dip and Coherence
Right-clicking on a Seismic Line or a Seismic Brick Cube and selecting "Seismic Trace Attributes..." pops up the following dialog:
...