Puget Sound faults about 1100 years ago (AD 900—930) an earthquake of magnitude 7+ uplifted Restoration Point and Alki Point, dropped West Point (the three white triangles in the Seattle Basin on the map), caused rockslides in the Olympics, landslides into Lake Washington, and a tsunami on Puget Sound. It extends as far east as (and probably terminates at) the Rattlesnake Mountain Fault Zone (RMFZ; the southern extension of the SWIF) near Fall City. This seems geologically reasonable, as both the SWIF and RMFZ appear to be the contact between Tertiary Crescent Formation basement of Puget Sound on the west and the older
Puget Sound AVA Puget Sound AVA The Puget Sound AVA is an American Viticultural Area in western Washington state. It is the only AVA in the state of Washington that is located west of the Cascade Mountains. The AVA encompasses the entire Puget Sound area from the Canada–US border to just south of Olympia. Rainfall in the Puget Sound AVA ranges from to annually, which is similar to many European grape growing areas and the Willamette Valley AVA in Oregon. Most of that rainfall occurs in the winter time. Summers are mild, sunny and dry. Irrigation is a necessity in some of the