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Eugene -Springfield Area Natural Hazards Mitigation Plan 4. Risk and Vulnerability MUSGS Understanding Risk °IiE ENE' urem IwecMuging wore .w., nu�.rs.mu,�.,�. Natural Hazard Potential Catastrophic and Chronic Physical Events • Past Recurrence Intervals • Future Probability • Speed of Onset • Magnitude • Duration • Spatial Extent N.Vulnerable System\ ' S Exposure, Sensitivity r Rlsk `t and Resilience of: 7 I • Population of I . Economy I • Land Use and Development Disaster, • Infrastructure and Facilities i I • Cultural Assets • Ecosystem Goods and Services Ability, Resources XX' and Willingness to: / \ • Mitigate • Respond / \ •Prepare •Recover Source: USGS-Oregon Portnersh;p far DisasterResilienre ResearcM1 Coliabormfon, 2006 Figure 4-1. Source: USGS — The Partnership for Disaster Resilience Research Collaborative, 2006 This section explains what risk assessments are, provides a summary of the Eugene - Springfield Regional Climate and Hazards Vulnerability Assessment conducted in 2013, and a description of the additional vulnerability and risk assessment efforts incorporated into this plan. 4.2.1 What is a Risk Assessment? A risk assessment consists of three phases (or levels): hazard identification, vulnerability assessment, and risk analysis (Figure 4-2). Risk assessments help to inform the local mitigation strategy. This assessment can be used to establish emergency preparedness and response priorities, for land use and comprehensive planning, and for decision making by elected officials, local departments, businesses, and organizations in the community. The Three Levels of Hazard Assessment Community -Wide Community- Wide Hazard Identification ' Vulnerability Assessment , Risk Analysis Figure 4-2. The Three Phases of a Risk Assessment. Source: Planning for Natural Hazards: Oregon Technical Resource Guide, 1998 4-2 January 2020