A 12 million cubic meter landslide occurred in Wulong county in southwest China’s Chongqing Municipality on Friday. There are some excellent blog posts on this rockslide at Dave’s Landslide Blog. This massive failure occurred in the vicinity of a mine (Iron ore?) being run by a private company since 2004 after Chinese government geologists labeled the site dangerous resulting in it being closed in 2000 after over 50-years of production. (Photo from Suomen Kuvalehti via Dave’s Landslide Blog)
The Utah Geologic Survey has released a "Landslide Susceptibility Map of Utah". They apparently relied quite heavily on GIS based thresholding of existing slope angles but only after they had statistically analyzed failure angles for particular geologic units. So it sounds like they throw the known landslides, the geologic map of Utah and a DEM into the GIS a blend it all up. Perhaps a slight oversimplification!