From time to time, extremely instructive films on natural hazard risks appear on the internet, how horrible they sometimes might be though. An impressive example is this movie showing a rockfall in Taiwan in August 2013. Such movies help to actually see the behaviour of large rocks impacting an asphalt road. Such observations are rare and help to improve models that are used to predict the runout distance and energies of large falling rocks. In the beginning of this movie, one can also see the rock mass detaching in the release zone (upper centre in the movie frame after 0:03 seconds).
