This is just awesome:
The flow looks like it's really cooking along... until people make an appearance in the video and you see just how much it's been sped up. The flow is actually moving at around 50 cm per hour, which to us fast-living humans makes it practically solid ground.
More info over at the AGU Landslide Blog.
And I totally agree with the first commenter over at the post. This thing needs some Benny Hill music, starting right when the first person pops into the frame. WIN.