• Cascadia 1 4 5 0
• Cascadia 1 4 5 0 2

By the early 1990s, Washington state officials knew the full scope of the Northwest's earthquake menace.

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1. Yet not once in recorded history has it caused a major earthquake—or, for that matter, any quake to speak of. By contrast, other subduction zones produce major earthquakes occasionally and minor ones all the time: magnitude 5.0, magnitude 4.0, magnitude why are the neighbors moving their sofa at midnight.
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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 Templates for pages 2 3 download free. 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

(from 1990 to 2014)

+42%

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) Coolant 2 0.

+40%

Cascadia 1 4 5 0

SEATTLE

SHELTON

Cascadia 1 4 5 0 2

Source: U.S. Geological Survey; U.S. Census Bureau

• Violent
• Severe
• Very strong
• Strong

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