Since I have a scientific mind, it occurs that the explanation for describing earthquake types
can be accomplished in either a "global" sense or a "linear" sense (Venus v Mars)
This is the simplest way to explain the differences in oscillatory and trepidatory earthquakes.
For the scientific community -
And for the simpler minded -
This is a trepidatory earthquake type movement
This is oscillatory earthquake type movement
And this is a combination of both types.
I bet you will never think of earthquakes in quite the same way again!