# 4.8.3.2. Interpolated Ground Motion¶

groundMotion(gmTag, 'Interpolated', *gmTags, '-fact', facts)

This command is used to construct an interpolated GroundMotion object, where the motion is determined by combining several previously defined ground motions in the load pattern.

 gmTag (int) unique tag among ground motions in load pattern gmTags (list (int)) the tags of existing ground motions in pattern to be used for interpolation facts (list (float)) the interpolation factors. (optional)