New answers tagged style
I like the term Radial Motion Blur as it describes both the appearance of the effect and how to achieve it in post processing (most Photoshop editors have a "radial blur" function). Zoom Blur does describe how to achieve the effect, though.
Zoom Burst, or Zoom Blur are a couple of variations of names of the effect you're talking about. More info on how to achieve it here, here, or here.
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