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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br /> <br /> <br />Chapter 4: Hazard Identification and Risk Assessment 122 <br />Table 4-61. Earthquake Risk Index (FEMA National Risk Index) <br />Jurisdiction Rating Score <br />Kittitas County Very High 93.0 <br />Risk Index scores are calculated using an equation that combines scores for Expected Annual Loss due to natural hazards, Soci al <br />Vulnerability and Community Resilience (Expected Annual Loss x Social Vulnerability / Community Resilience = Risk Index). <br /> <br />Table 4-62 represents the earthquake Total Risk Score for the Kittitas County, based on the Risk <br />Assessment Methodology, as defined in Section 4.3 of this Plan. <br />Table 4-62. Earthquake Total Risk Score <br />Hazard <br />Event <br />Probability Consequence Total Risk <br />Probability <br />Factor Extent Vulnerability Impact Consequence <br />Score <br />Total Risk <br />Score* <br />Earthquake 2 12 16 33 61 59 <br />Consequence: Sum of all weighted factors. <br />Extent: Sum of the weighted Extent factors. <br />Vulnerability: Sum of the weighted Vulnerability factors. <br />Impact: Sum of the weighted Impact factors. <br />Total Risk Score = Probability x Consequence <br />* Normalized to 100 <br />Total Risk Score Legend <br />Classification Probability <br />Factor Extent Vulnerability Impact Consequence <br />Score <br />Total Risk <br />Score <br />Low (L) 1 0 – 6 0 – 6 0 – 12 0 – 24 0 – 24 <br />Medium (M) 2 7 – 12 7 – 12 13 – 26 25 – 50 25 – 52 <br />High (H) 3 13 – 18 13 – 18 27 – 39 51 – 75 53 and above <br />The legend—specifically the assignment of low, medium, and high—provides an additional means to qualitatively assess the probability factor, sum of <br />weighted factors, and the total risk scores for each hazard. The Consequence Score represents the sum of the Extent, Vulnerability, and Impact Factors. <br />The Total Risk Score is a measure of Probability and Consequence. <br />