This filter is found in
.It creates a motion blur by adding thin trails along vertical borders.
Preview
All your setting changes will appear in the Preview without affecting the image until you click on OK. It reproduces a part of the image only, centred on the first modified area it has encountered.
Parameter Settings
The following illustrations are based on this image:
Wind: This option is the most suggestive of a moving effect. Trails are thin.
Blast: This option wants to suggest a blast due to an explosion. Trails are thick.
You can select the direction, Left or Right the wind comes from.
Leading: Trails will start from the front border, falling on the object itself. It suggests that a violent wind is pulling color out.
Trailing: Trails start from the back border of the object.
Both: Cumulates both effects.
Threshold: It's the threshold to detect borders. The higher it is, the fewer the detected borders will be.
Strength: Higher values increase the strength effect.