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 Allyn-Grapeview. Evan planted several varieties of "Vitis labrusca" there. The Puget Sound AVA contains many wineries, most of which get their grapes from Eastern Washington. There are about 12 wineries that either grow their own grapes or buy grapes from growers in the 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