On 4th June 2012 a series of debris flows were caught on video within  the Rif Blanc watershed in the department of Hautes-Alpes in France.  The debris flows are now on Youtube:

The location of the landslide is at Lat: 45.0424, Long: 6.4265.  The Google Earth perspective view shows the location of the video and the catchment well:

Thanks to Alexandre Mathieu for highlighting these videos and for providing more details.