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The passive roof duplex model of Brocher et al. (2001), [111] relying on seismic tomography data from the "Seismic Hazards Investigation in Puget Sound" (SHIPS) experiment, retains the thrusting slab and master ramp concepts, but interprets the Tacoma fault as a reverse fault (or back thrust) that dips north towards the south dipping Seattle ...
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 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 ...
State Route 503 (SR 503) is a 54.11-mile-long (87.08 km) state highway serving Clark and Cowlitz counties in the U.S. state of Washington.The highway travels north from a short concurrency with SR 500 in Orchards through Battle Ground, the eastern terminus of SR 502, and communities in rural Clark County before crossing the Lewis River on the Yale Bridge.
I-5 at Oregon state line in Vancouver: Highway 99 at Canadian border in Blaine: 1957 [26] current Main north–south corridor in Western Washington; completed in 1969. [36] Officially designated the Purple Heart Trail since 2013. [57] I-82: 132.57: 213.35 I-90 / US 97 in Ellensburg: I-82 / US 395 at Oregon state line near Plymouth: 1957 [30]
They towed a 9-plus-mile-long cable, called a streamer, behind the boat, which used 1,200 hydrophones to capture returning echoes. “That gives us a picture of what the subsurface looks like ...
A newly found fault line with a rare slanted angle shows why an earthquake rattled New York City in April harder than its epicenter in New Jersey — and may be a bigger seismic activity threat ...
On October 15, 1927, the North Trunk Highway was opened between Seattle and Everett, providing a shorter and more direct route that would later be designated as US 99 and the Pacific Highway. [39] [40] The Bothell Highway was renovated from Seattle to Lake Forest Park in 1939, including a widening to four lanes and straightening of some ...