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The Seattle Fault is the structural boundary where 50–60 million years old (early Tertiary) basalt of the Crescent Formation on the south has been uplifted – the Seattle Uplift – and is tipping into the Seattle Basin, where the Tertiary bedrock is buried under at least 7 km (4.3 miles) of relatively softer, lighter sedimentary strata of ...
The Seattle Fault is a zone of complex thrust and reverse faults – between lines E and F on the map – up to 7 km wide and over 70 km long that delineates the north edge of the Seattle Uplift. It stands out in regard of its east–west orientation, depth to bedrock, and hazard to an urban population center.
The Tacoma Fault Zone marks the south end of the Seattle Uplift, of which the similar and related Seattle Fault Zone marks the north end. This uplift is believed to be either a slab of rock about 15 km thick being pushed up a ramp, or a wedge being popped up between these two faults, by tectonic forces from the south or south-west as tectonic plates riding on top of the Juan de Fuca plate are ...
The Seattle Fault cuts across Puget Sound, crossing the southern tip of Bainbridge Island and under Elliott Bay. [15] [better source needed] To the south, the existence of a second fault, the Tacoma Fault, has buckled the intervening strata in the Seattle Uplift.
Tectonic uplift is the geologic uplift of Earth's surface that is attributed to plate tectonics. While isostatic response is important, an increase in the mean elevation of a region can only occur in response to tectonic processes of crustal thickening (such as mountain building events), changes in the density distribution of the crust and ...
“As the company’s founder, my mission is to provide extraordinary adventures with partners committed to community uplift and conservation.” Key Moment: Sleeping under the stars in the ...
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Seattle was selected to host the World's Fair in 1962, revitalizing the downtown area and bringing the construction of the fairgrounds' centerpiece, the Space Needle. The 605-foot (184 m) observation tower became the symbol of the fair and a landmark for Seattle, and was the first new structure to surpass the Smith Tower in height. [15] [20]