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The Seattle Fault was first recognized as a significant seismic hazard in 1992, when a set of reports showed that about 1,100 years ago it was the scene of a major earthquake of about magnitude 7 – an event that entered Native American oral traditions. Extensive research has since shown the Seattle Fault to be part of a regional system of faults.
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 ...
("Earthquake Fault Zones" were called "Special Studies Zones" prior to January 1, 1994.) The maps are distributed to all affected cities, counties, and state agencies for their use in planning and controlling new or renewed construction. Local agencies must regulate most development projects within the zones.
The proximity of the Convergence Zone to the King-Snohomish County line is the reason that cities located just north or south of the line, which are located within the rain shadow of the Olympic Mountains, approach Seattle in annual precipitation. The effect of the Puget Sound Convergence Zone nearly offsets that of the rain shadow. [4]
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UTC time: 2001-02-28 18:54:32: ISC event: 1780664: USGS-ANSSComCat: Local date: February 28, 2001 (): Local time: 10:54:32 a.m. [1] Magnitude: 6.8 M w [1]: Depth: 57 km (35 mi) [1] Epicenter: 1]: Type: Normal [2]: Areas affected: Pacific Northwest: Total damage: $1–4 billion [3]: Max. intensity: MMI VIII (Severe) [4]: Peak acceleration: 0.3 g [4]: Tsunami: No: Casualties: 1 dead (heart ...
Law enforcement in Seattle swept into the protester-controlled Capitol Hill Occupied Protest Zone Wednesday, reportedly arresting at least 31 people. Known as CHOP, the zone several blocks long ...