20 Facts about Mount St. Helens - KULR8.com | Montana's News Leader | Billings, MT

20 Facts about Mount St. Helens

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Where were you when Mt. St. Helens erupted? Let us know your stories and feel free to post your photos too! More facts about #MountStHelens here :http://bit.ly/1II4dRg

Posted by KHQ Local News on Monday, May 18, 2015
Mt. St. Helens ash at WSU

Today marks the 35th anniversary of the #MtStHelens eruption. Here's some raw footage of the ash & its impact to Washington State University. Video courtesy of The Edward R. Murrow College of Communication, Washington State University #WSU #GoCougs

Posted by Washington State University on Monday, May 18, 2015
During the past 4,000 years, Mount St. Helens has erupted more frequently than any other volcano in the Cascade Range. During the past 4,000 years, Mount St. Helens has erupted more frequently than any other volcano in the Cascade Range.
March 20, 1980—A magnitude 4.2 earthquake signaled the reawakening of the volcano after 123 years. March 20, 1980—A magnitude 4.2 earthquake signaled the reawakening of the volcano after 123 years.
Morning of May 18, 1980— The largest terrestrial landslide in recorded history reduced the summit by 1,300 feet and triggered a lateral blast. Morning of May 18, 1980— The largest terrestrial landslide in recorded history reduced the summit by 1,300 feet and triggered a lateral blast.
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MOUNT ST. HELENS -

MOBILE USERS CLICK HERE TO VIEW SLIDESHOW AND FACTS

It was 36 years ago that Mount St. Helens erupted. 

The blast took more than 1,300 feet off the top and rained volcanic ash for miles around. Eastern Washington was covered in volcanic ash, and the cloud drifted east across the United States in 3 days and encircled Earth in 15 days.

Here are some more facts about the volcano, which remains active to this day, courtesy of the U.S. Geological Survey. 

*Photos used in slideshow courtesy of USGS, KHQ, and KHQ viewers via Facebook.

1 - During the past 4,000 years, Mount St. Helens has erupted more frequently than any other volcano in the Cascade Range. 

2 -  Most of Mount St. Helens is younger than 3,000 years old (younger than the pyramids of Egypt).

3 -  3,600 years ago—Native Americans abandoned hunting grounds devastated by an enormous eruption four times larger than the May 18, 1980 eruption. 

4 - 1792 —Captain George Vancouver named the volcano for Britain's ambassador to Spain, Alleyne Fitzherbert, also known as Baron St. Helens. 

5 - 1975—U.S. Geological Survey geologists forecasted that Mount St. Helens would erupt again, “possibly before the end of the century.” 

6 - March 20, 1980—A magnitude 4.2 earthquake signaled the reawakening of the volcano after 123 years. 

7 - Spring 1980—Rising magma pushed the volcano's north flank outward 5 feet per day. 

8 - Morning of May 18, 1980— The largest terrestrial landslide in recorded history reduced the summit by 1,300 feet and triggered a lateral blast. 

9 - Within 3 minutes, the lateral blast, traveling at more than 300 miles per hour, blew down and scorched 230 square miles of forest. 

10 - Within 15 minutes, a vertical plume of volcanic ash rose over 80,000 feet. 

11 - Afternoon of May 18, 1980—The dense ash cloud turned daylight into darkness in eastern Washington, causing streetlights to turn on in Yakima and Ritzville. 

12 - The volcanic ash cloud drifted east across the United States in 3 days and encircled Earth in 15 days. 

13 - Lahars (volcanic mudflows) filled rivers with rocks, sand, and mud, damaging 27 bridges and 200 homes and forcing 31 ships to remain in ports upstream. 

14 - The May 18, 1980 eruption was the most economically destructive volcanic event in U.S. history. 

15 - Small plants and trees beneath winter snow, and roots protected by soil, survived the May 18, 1980 eruption and now thrive. 

16 - Thousands of birds, mammals, reptiles, amphibians, and millions of hatchery fingerlings perished in the eruption. 

17 - Effects of the May 18, 1980 eruption continue today. Biologists help wild salmon and steelhead by giving them a tank-truck ride to the pristine, clear creeks above sediment-choked rivers.

18 - October 1980 to 1986— Over the course of 17 episodes, lava eruptions began filling the crater, building a lava dome that reached 876 feet above the crater floor. 

19 - September 2004—Mount St. Helens reawakened, and it erupted continuously until January 2008. 

20 -  During the 1980 to 1986 and the 2004 to 2008 eruptions—Lava oozed onto the crater floor, building domes taller than the Empire State Building and restoring 7 percent of the volume lost in 1980. 

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