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2025 Hazard Mitigation Plan <br />Kittitas Gounty, Washington <br />Figure 4-11 illustrates earthquake events greater than Magnitude 4.1 within 20 miles of Kittitas County <br />Figure 4-11. Earthquake History in Kittitas County Area <br />4.6.4,3. HazardExtenUlntensity <br />Earthquakes are measured both in terms of their inherent magnitude and in terms of their local intensity. <br />There are several standard measures of earthquakes, including the Richter Scale and the Modified <br />Mercalli lntensity (MMl) scale. The Richter Scale measures the magnitude or amount of energy an <br />earthquake releases. Magnitude is measured by seismographs. The MMI scale is an observed <br />measurement of the earthquake's intensity felt at the earth's surface and it varies depending on the <br />observer's location atthe earthquake's epicenter. The MMI Scale is comprised of 12 increasing levels, <br />designated by Roman numerals, which range from imperceptible shaking to catastrophic destruction. <br />Furthermore, the MMI can be used to map earthquake impacts.133 <br />Table 4-50 correlates the MMI Scale with the Richter Scale and effects of ground shaking. <br />133 Pacific Northwest Seismic Network. (n.d.). Magnitude/lntensity. Retrieved from <br />https ://pnsn.orq/outreach/about-earthq uakes/maqnitude-i ntensitv. <br />''?ei' <br />a <br />i <br />l- <br />! <br />b-r <br />w*,-.4* <br />I'rbw 2", Kiflitas <br />\i <br />*+,, <br />s <br />iJ <br />).(- ^ , a,F <br />Elum <br />o <br />77 25.5o 4.25 8.5 <br />c8rmin. HERE,Nallonal olher <br />Magnltude <br />- <br />Rivsr f__] Municipalities <br />a <br />Sour@s: <br />Gounty WA: Earthquake History <br />-. - state Road I xinitas county <br />! 4.1 <br />a 4.2 <br />a 4.3 <br />a 4.5 <br />O5 <br />- <br />lnterstale f//- aostyn <br />E US Hignway i-- rakes <br />Chapter 4: Hazard ldentification and Risk Assessment 109