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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br />Kittitas County Very High 93.0 <br />Risk lndex scores are calculated using an equation that combines scores for Expected Annual Loss due to natural hazards, Social <br />Vulnerability and Community Resilience (Expected Annual Loss x Social Vulnerability / Community Resilience = Risk Index). <br />Jurisdiction Rating Score <br />Table 4-61. Earthquake Risk Index (FEMA National Risk Index) <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 Probability <br />Factor Vulnerability lmpact <br />Earthquake 2 12 16 33 61 <br />Consequence: Sum of ail weighted factors. <br />Extent: Sum of the weighted Extent factors. <br />Vulnerability: Sum of the weighted Vulnerabilitv factors. <br />lmpactGlassificationVulnerability <br />Impact: Sum of the weighted lmpact factors. <br />Total Risk Score = Probability x Consequence <br />* Normalized to 100 <br />0 -24Low (L)1 0-6 0-6 0-12 0 -24 <br />Medium (M)2 7-12 7-12 13-26 25-50 25-52 <br />J 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 />weightedfactors,andthetotalriskscoresforeachhazard. TheConsequenceScorerepresentsthesumoftheExtent,Vulnerability,andlmpactFactors. <br />The Total Risk Score is a measure of Probabilitv and Conseouence. <br />TotalRisk <br />.irr,i ir i,lji j: <br />.-ljirl.rl;'r. <br />:':, i !rl <br />{llir:triri 11 lltt <br />Total Risk Score Legend <br />TotalRisk <br />Score <br />Chapter 4. Hazard ldentification and Risk Assessment 122