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
Oyster Bay (Puget Sound) Oyster Bay (Puget Sound) Oyster Bay is an inlet in southern Puget Sound which branches off from Totten Inlet. The bay spans Mason and Thurston counties, in the U.S. state of Washington. Kennedy Creek empties into the bay at the U.S. Highway 101 overpass. Oyster Bay was named for the oyster industry it supports. The bay is the site of one of only four oyster reserves in Puget Sound where the Olympia oyster grows. Oyster Bay is one of the most productive chum salmon runs in the state with over 40,000 spawners a year, estimated to be two-thirds of the