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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br />ones) on the fault..130 A quaternary fault (i.e., potentially active faults) are those that have moved in the <br />past 1.6 million years). 131 <br />4.6.4.2. HazardLocation <br />Kittitas County is located in an area with high seismic activity with numerous local faults. The State of <br />Washington has dozens of active faults and fault zones, some of which are in remote areas. However, <br />some faults such as the Seattle faults and the southern Whidbey lsland fault zone are under major cities <br />and pose a significanl hazard. The largest active fault that will affect the State and the entire Pacific <br />Northwest is the CSZ. The CSZ is capable of producing some of the largest and most damaging <br />earthquakes in the world. Although larger faults produce larger earthquakes, other faults regardless of <br />their size can cause significant damage if they rupture..132 <br />There are a series of active fault systems within Kittitas County, most of which are located in the eastern <br />portion of the County. Figure 4-10 illustrates the fault systems located within Kittitas County. <br />Figure 4-10. Fault Systems Located Within Kittitas County <br />130 Washington State Department of Natural Resources. (n.d.). Earthquakes and Faults. Retrieved from <br />https:/iwww.dnr.wa.gov/proqrams-and-servicesiqeoloqyiqeoloqic-hazards/earthquakes-and-faults#active-faults- <br />and-future-earthquakes. <br />131 U.S. Geological Survey. (n.d.) What is a "Quaternary" fault? Retrieved from https://www.usgs.qov/faqs/what- <br />quaternarv-fault. <br />132 Washington State Department of Natural Resources. (n.d.). Earthquakes and Faults. Retrieved from <br />https://www.dnr.wa.gov/proqrams-and-services/geoloqv/qeoloqic-hazards/earthquakes-and-faults. <br />I <br />l <br />I <br />I <br />I <br />) <br />,\ Klttltas\:l <br />\! <br />A{t)>rrY <br /> f*? <br />!. <br />tt <br />li <br />I' <br />il <br />lr <br />7.5 1 <br />f <br />\ <br />30 <br />NOM. <br />Kittitas County WA: Fault Systems <br />-^ <br />state Road <br />ActiveFaull I lMunicipslilies <br />River (///Traoaynvwtersnea <br />lnterstate I i t"fu" <br />Us HigtMay I rittltas county <br />Chapter 4: Hazard ldentification and Risk Assessment 108