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Eugene -Springfield Area Natural Hazards Mitigation Plan <br />2. Hazard Descriptions <br />slopes of 25 percent or greater" are not considered "suitable and available" under <br />the buildable land definition. <br />A summary of the results of the IMS-60 Study (Table 2-9) show the applicable zone <br />and associated estimated population and building and land value for each zone <br />identified in the study. As such, residential vulnerability to landslides is low. <br />Table 2-9 Summary of Exposure of Select Assets to Landslides <br />(Adapted from IMS-60 Tables 4-4 and 4-5 <br />Landslide Zone <br />Estimated <br />Estimated Building & <br />Population <br />Land Value <br />Existing Landslides <br />4,615 <br />$1.13B <br />Shallow Landslides — <br />4,649 <br />$4.92B <br />Highly Susceptible <br />Deep Landslides — Highly <br />5,232 <br />$0.87B <br />Susceptible <br />Table 2-9 Source: DOGAMIIMS-60 Landslide Hazard and RiskStudy. (Adapted from IMS-60 <br />Tables 4-4 and 4-5) 2018 <br />One additional analysis provided in the IMS-60 Study is the risk of earthquake - <br />induced landslides. The study indicates about 1.5% of the building damage, within <br />the overall study area, may be caused by landslides triggered by a Cascadia <br />Subduction Zone (CSZ) earthquake. By contrast, nearly 20% of the building <br />damage in the East Springfield study area following a CSZ earthquake may be from <br />landslides.63 <br />The Eugene -Springfield Steering Committee rated the Cities' vulnerability to <br />landslides as low, meaning less than 10% of the population and/or regional assets <br />would be affected by a landslide incident. Additionally, due to available resources <br />and the generally limited scale of a landslide, the area's overall capacity to deal <br />with such an incident is moderate. <br />2.7.7 Risk Assessment <br />The IMS-60 Study identified four primary conclusions about the risk of landslides <br />in the Eugene -Springfield area: <br />• Large, deep landslides area primary threat in the study area, and asset <br />exposure to these landslides is significant. More than 4,500 residents and <br />63 United States. DOGAMI. Landslide Hazard and Risk Study ofEugene-Springfield and Lane <br />County, Oregon. 2018. Accessed August 2019. https://www.oregongeoiogy.org/l)ubs/ims/IMS- <br />60/IMS 60 report.pdf <br />2-50 January 2020 <br />