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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br /> <br /> <br />Chapter 4: Hazard Identification and Risk Assessment 114 <br />Figure 4-14. USGS National Seismic Hazard Map <br /> <br /> <br />The earthquake annualized frequency value represents the modeled frequency of an earthquake hazard <br />occurrence per year. A higher annualized frequency value results in higher EAL and Risk Index scores. <br />Table 4-52 outlines the annualized frequency for earthquakes, based on FEMA NRI data, for Kittitas <br />County. <br />Table 4-52. Earthquake Annualized Frequency (FEMA National Risk Index) <br />Location Events on Record <br />(2021 Dataset) Annualized Frequency <br />Kittitas County N/A 0.287% chance per year <br />Annualized frequency is defined as the expected frequency or probability of a hazard occurrence per year. <br />4.6.4.5. Past Events <br />Washington, especially the Puget Sound basin, has a history of frequent earthquakes. According to the <br />DNR, earthquakes occur almost every day throughout the State. However, most are too small to be felt <br />or cause damage. Larger magnitude earthquakes, which result in damage, occur less frequently.142F <br />142 More <br /> <br />142 Washington State Department of Natural Resources. (n.d.). Earthquakes and Faults. Retrieved from <br />https://www.dnr.wa.gov/programs-and-services/geology/geologic-hazards/earthquakes-and-faults.