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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br />Figure 4-14. USGS National Seismic Hazard Map <br />trrrscs <br />Frequency of Damaglng Earthquake Shaking Around the U.S <br />l- <br />!LT---------r'-- <br />,'l I <br />I <br />i <br />oMlnn€E on <br />t <br />oLlncoln lngtonq_{\t C <br />I Erpeclad numbor <br />of occuatcnce! of <br />I <br />drmaging <br />osrlhqu.ksg <br />rhaking <br />ln 10,000 yolta <br />I , 25O <br />tot) - 25c <br />5C - ltYJ <br />at-50 <br />10-20 <br />2-4 <br />OAu6lln ant <br />ALska <br />t\ <br />Pu€rto Rl.o t U.S. Vkgh lrltndrr t:s!5pKted <br />tbrBclonla <br />srlhq!ake! <br />DrludPd <br />I <br />fry,th <br />Hrwrii <br />6Honotutur> <br />) <br />1O <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 lndex 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 />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..la2 More <br />1a2 Washington State Department of Natural Resources. (n.d.). Earthquakes and Faults. Retrieved from <br />https:/iwww.dnr.wa.qov/proqrams-and-services/qeoloqv/qeologic-hazards/earthquakes-and-faults. <br />N/A 0.287% chance per yearKittitas County <br />Annualized frequency is defined as the expected frequency or probability of a hazard occurrence per year. <br />Location Events on Record Annualized Frequency <br />Chapter 4: Hazard ldentification and Risk Assessment 114