Laserfiche WebLink
2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br /> <br /> <br />Chapter 4: Hazard Identification and Risk Assessment 108 <br />ones) on the fault.130F <br />130 A quaternary fault (i.e., potentially active faults) are those that have moved in the <br />past 1.6 million years).131F <br />131 <br />4.6.4.2. Hazard Location <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 Island fault zone are under major cities <br />and pose a significant 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.132F <br />132 <br /> <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 /> <br /> <br />130 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#active-faults- <br />and-future-earthquakes. <br />131 U.S. Geological Survey. (n.d.) What is a "Quaternary" fault? Retrieved from https://www.usgs.gov/faqs/what- <br />quaternary-fault. <br />132 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.