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
Port Washington Narrows Port Washington Narrows The Port Washington Narrows is a tidal strait located in Bremerton, Washington, United States. The northwest entrance is marked on the west side by Rocky Point, and the southeast entrance is located at Point Turner on the west side and Point Herron on the east side. It is located between downtown Bremerton and the Manette Peninsula. It is through this channel that Dyes Inlet drains into Sinclair Inlet and into Puget Sound. Tidal currents attain velocities in excess of 4 knots at times. The Narrows divide the city of Bremerton into east and west portions, which are