Where are the earthquake fault lines in Washington state?
Most faults in Washington are a mix of a strike-slip fault and a thrust or reverse fault. These combination faults are called oblique faults and include the Seattle fault, southern Whidbey Island fault zone, and Darrington–Devils Mountain fault zone.
Does the San Andreas fault run through Washington State?
Just north of the San Andreas, however, lies another fault line. Known as the Cascadia subduction zone, it runs for seven hundred miles off the coast of the Pacific Northwest, beginning near Cape Mendocino, California, continuing along Oregon and Washington, and terminating around Vancouver Island, Canada.
Where is the Seattle fault zone?
The Seattle fault zone is a 4- to 7-km-wide east-trending fault zone that extends from the Cascade Range foothills on the east across the Puget Lowland to Hood Canal, crossing Lake Sammamish, Lake Washington, Puget Sound, Bainbridge Island, and the Kitsap Peninsula.
Does Seattle sit on a fault line?
Second, the Seattle Fault, which runs east to west just south of downtown Seattle. It ends up near the Cascade Mountains and west onto the Olympic Peninsula. The Seattle Fault zone crosses Bainbridge Island, West Seattle, South Seattle, and Mercer Island.
What is the largest fault in the Washington area?
| Seattle Fault | |
|---|---|
| Length | 70 km (43 mi) |
| Tectonics | |
| Plate | North American |
| Status | Active |
Will Seattle sink?
Climate change is expected to accelerate rising sea levels during the next century. Central estimates indicate that Seattle will experience 10 inches of sea-level rise by 2050, and 28 inches by 2100, and 47 inches by 2150.
Where are US fault lines?
The New Madrid Seismic Zone (NMSZ) in the Central United States, comprising Arkansas, Illinois, Indiana, Kentucky, Missouri, Ohio, and Tennessee, also has the potential to produce large, destructive quakes—as it did in the winter of 1811-1812.
Where can I find information about active faults in Washington State?
Geologists from the Washington Geological Survey map and characterize faults throughout the state every year. We also combine and publish these data for the entire state. The Geologic Information Portal has a Natural Hazards single-topic map that shows active faults and earthquakes.
What does the Washington State seismic risk map show?
This map shows areas of seismic risk from high (red) to low (grayish-green). The map is from a 2007 report (click here to download) on seismic design categories in Washington. The map also shows potentially active faults from a separate 2014 report (click here to download). Earthquakes occur nearly every day in Washington.
How deep are faults and earthquakes in the Pacific Northwest?
In the Pacific Northwest we use the term ‘shallow’ to talk about faults and earthquakes less than 18 miles deep. These faults and earthquakes occur in the continental crust of North America. We use the term ‘deep’ to talk about faults and earthquakes deeper than about 18 miles.
Are there any maps that show the location of major faults?
State (Jennings, 1975; Witkind, 1975; 1975; 1975; 1976; Menges and Pearthree, 1983 #2073), regional (Nakata and others, 1982), and National Howard and others, 1978) maps were compiled to show the location and relative timing of major faults. These map compilations, however, did not provide much supporting data.