first suspected mapping of gravitational anomalies in 1965 , uplifted marine terrace @ restoration point (foreground in picture above), seattle fault s existence , hazard established set of 5 reports published in science in 1992. these reports looked @ timing of abrupt uplift , subsidence around restoration point , alki point (distant right side of picture), tsunami deposits on puget sound, turbidity in lake paleosediments, rock avalanches, , multiple landslides around lake washington, , determined these happened 1100 years ago (between a.d. 900–930), , due earthquake of magnitude 7 or greater on seattle fault.
representation of yahos spirit.
although a.d. 900–930 earthquake on thousand years ago, local native legends have preserved association of powerful supernatural spirit – yahos, noted shaking, rushes of water, , landsliding – 5 locales along trace of seattle fault, including spirit boulder called psai-yah-hus near fauntleroy ferry dock in west seattle.
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