Editing Seattle Fault (section)

== Notable earthquake ==
{{See also|Lake Washington sunken forests}}
First suspected from mapping of gravitational anomalies in 1965<ref>{{Harvnb|Danes|others|1965}}.</ref> and an uplifted [[marine terrace]] at Restoration Point (foreground in picture above), the Seattle Fault's existence and likely hazard were definitively established by a set of five reports published in ''Science'' in 1992.  These reports looked at the timing of abrupt uplift and subsidence around Restoration Point and [[Alki Point, Seattle|Alki Point]] (distant right side of picture),<ref>{{Harvnb|Bucknam|others|1992}}.</ref> [[tsunami deposit]]s on Puget Sound,<ref>{{Harvnb|Atwater|Moore|1992}}.</ref> turbidity in lake paleosediments,<ref>{{Harvnb|Karlin|Abella|1992}}.</ref> rock avalanches,<ref>{{Harvnb|Schuster|others|1992}}.</ref> and multiple landslides around Lake Washington,<ref>{{Harvnb|Jacoby|others|1992}}.</ref> and determined that all these happened about 1,100 years ago (between 923 and 924 [[Common Era|CE]],<ref>{{cite journal | doi=10.1126/sciadv.adh4973 | date=2023 | volume=9 | issue=39 | last1=Black | first1=Bryan A. | last2=Pearl | first2=Jessie K. | last3=Pearson | first3=Charlotte L. | last4=Pringle | first4=Patrick T. | last5=Frank | first5=David C. | last6=Page | first6=Morgan T. | last7=Buckley | first7=Brendan M. | last8=Cook | first8=Edward R. | last9=Harley | first9=Grant L. | last10=King | first10=Karen J. | last11=Hughes | first11=Jonathan F. | last12=Reynolds | first12=David J. | last13=Sherrod | first13=Brian L. | title=A multifault earthquake threat for the Seattle metropolitan region revealed by mass tree mortality | journal=Science Advances | pages=eadh4973 | pmid=37756412 | pmc=10530078 | bibcode=2023SciA....9H4973B }}</ref> and most likely due to an earthquake of magnitude 7 or greater on the Seattle Fault.
[[File:ayahos3.png|thumb|left|upright=1.2|Representation of the a'yahos spirit.]]

Although the 923-924 CE earthquake was over a thousand years ago, local traditional stories have preserved an association of a powerful supernatural spirit – a'yahos, noted for shaking, rushes of water, and landsliding – with five locales along the trace of the Seattle Fault, including a "spirit boulder" called [[Psai-Yah-hus]] near the [[Fauntleroy, Seattle|Fauntleroy]] ferry dock in West Seattle.<ref>{{Harvnb|Ludwin|others|2005}}; {{Harvnb|Buerge|1985}}.</ref>
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