Cascadia 1 4 5 0
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By the early 1990s, Washington state officials knew the full scope of the Northwest's earthquake menace.
It went from something like a magnitude 6.8 quake that shakes for up to 40 seconds...
- M 6.8 Nisqually quake in 20011
- 125 displaced people
- 1 death
- $2 billion in damage
...to something 2,000 times more powerful, a potential magnitude 9.0 quake that would shake for up to five minutes:
- Projected M 9.0 Cascadia quake2
- 915,000 displaced people
- 14,600 deaths
- $81 billion in damage
Since then, geologists have discovered more than two dozen faults across Washington.
- Active
- Potentially active
Today, about 5.4 million people in Washington live in the zone endangered by a magnitude 9.0 Cascadia megaquake, an increase of 1.6 million since 1990, according to a Seattle Times analysis.3
MOUNT VERNON
EVERETT
Areas of strong shaking or higher from a potential Cascadia quake
Population increase in these areas:
1.6 million
Cascadia 1 4 5 0
(from 1990 to 2014)
+42%
Cascadia 1 4 5 0 2
OLYMPIA
CENTRALIA
LONGVIEW
Source: U.S. Geological Survey; U.S. Census Bureau
- Severe
- Very strong
- Strong
Yet Washington lags nearly all other quake-prone states in policies to reduce the risk, with, for example, no seismic-safety laws for schools, hospitals and other vulnerable buildings, according to a policy analysis this year.
Magnitude 9.0 earthquakes strike the Northwest about every five centuries. But some were only 200 years apart – and it's been 316 years since the last one.
The Big One will shake the entire Pacific Northwest for four to five minutes, longer than the five biggest quakes in Washington's recorded history combined. Communities will lose power and remain dark for weeks. Some 14,600 people could perish in Washington and Oregon, according to the Federal Emergency Management Agency.
It's likely to be one of the worst disasters the United States has ever faced.
And it isn't the worst earthquake that threatens Seattle. The Northwest's biggest city lies above a different fault that could wreak more havoc locally than The Big One.
The number of people endangered by a magnitude 7.2 Seattle fault quake has increased by 1.2 million since 1990.
MOUNT VERNON
Areas of strong shaking or higher from a potential Seattle quake
LA PUSH
Population increase in these areas:
1.2 million
(from 1990 to 2014)
+40%
SEATTLE
SHELTON
Source: U.S. Geological Survey; U.S. Census Bureau
- Violent
- Severe
- Very strong
- Strong
Read the continuing series:
| Look up Cascadian or Cascadia in Wiktionary, the free dictionary. |
Cascadia and Cascadian are terms that derive from the Cascade Range and may refer to:
Places[edit]
Regional[edit]
- Cascadia Channel, a deep-sea channel in the Pacific Ocean
- Cascadia (region) or Pacific Northwest, a region of North America
- Cascadia (bioregion), the environmental interactivity of the Pacific Northwest of North America
- Cascadia (independence movement), a proposed country located within the Cascadia bioregion of the Pacific Northwest of North America
- Cascadia subduction zone, a convergent plate boundary that separates the Juan de Fuca and North America plates
Other uses[edit]
- Cascadia, a former plant genus now included in Saxifraga
- Cascadia, the codename of Windows Terminal
- Freightliner Cascadia, a semi truck
- Cascadia Code, a monospaced font from Microsoft
- METAtropolis: Cascadia, a science fiction story collection audiobook
See also[edit]
- 1700 Cascadia earthquake, a magnitude 8.7 to 9.2 megathrust earthquake that occurred in the Cascadia subduction zone on January 26, 1700