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Eugene -Springfield Area Natural Hazards Mitigation Plan <br />2. Hazard Descriptions <br />2,500 buildings, and a combined building and land value of about $950 <br />million would be affected. <br />• 8,350 buildings are located in the high shallow landslide susceptibility zone, <br />with close to $5 billion worth of land and buildings exposed. <br />• Annual historic landslide losses range from $99,000-$306,000; in extreme <br />years (such as 1996), this increases to several million. <br />• Damage and losses from landslides alone, induced by a local crustal or a <br />Cascadia Subduction Zone earthquake, may result in an estimated 2,770 <br />buildings being moderately to completely damaged and close to 600 <br />residents in need of shelter. In most communities, <5% of earthquake <br />damage would come from landslides. However, in some communities, <br />potential landslides triggered by the earthquakes could cause a 20% increase <br />in damage and losses. <br />Based upon these conclusions, DOGAMI considers the overall risk of landslide in <br />the study area to be moderate. The Steering Committee concurs. <br />A summary of Impact Risks is in Table 2-10. <br />Table 2-10 Landslide - Impact Risks <br />Cascading Incident <br />A <br />Civil Unrest <br />-Ranking <br />No Known <br />Dam or Levee Failure <br />Low <br />Epidemic <br />Low <br />Hazardous Materials <br />Low <br />2.7.8 Existing Hazard Mitigation Activities <br />In Eugene and Springfield, mitigation of the landslide hazard is accomplished <br />through land use and development regulations. Both require geotechnical analysis <br />of steep slopes prior to development to determine whether a development is <br />appropriate for the area. <br />The probability of volcanic activity impacting Eugene -Springfield is low. <br />Vulnerability to volcanic activity is moderate for the Eugene -Springfield area. <br />2.8.1 Causes and Characteristics of the Hazard <br />The Cascade Range, which runs from British Columbia through Washington, <br />Oregon, and into northern California, contains more than a dozen major volcanoes <br />and hundreds of smaller volcanic features. In the past 200 years, seven of the <br />2-51 January 2020 <br />