More than a third of Oregon has high or very high landslide susceptibility. That's according to a recently released map by the State Department of Geology. High risk areas are categorized by historic slide activity, slope, and land composition. This is the first time since 1982, when the U.S. Geological Survey published a nationwide overview, that Oregon's slide hotspots were identified. Ali Ryan Hansen is a spokeswoman for the State Department of Geology.