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Mount St. Helens Fast Facts

Here's a look at Mount St. Helens, ...

Posted: Apr 26, 2018 10:52 AM
Updated: Apr 26, 2018 10:52 AM

Here's a look at Mount St. Helens, the most active volcano in the Cascade Mountains in Washington.

Facts:
Mount St. Helens is a volcano in the Cascade Mountains, in the area called the Mt. St. Helens National Volcanic Monument. It is administered by the National Forest Service, not the National Park Service.

It is located in Washington, about 55 miles northeast of Portland, Oregon, and 95 miles south of Seattle.

Over the last 500 years, Mount St. Helens has had at least four major explosive eruptions and many minor eruptions.

Mount St. Helens was named by Commander George Vancouver for British diplomat Alleyne Fitzherbert, whose title was Baron St. Helens.

Timeline:
1792-1794 - The mountain is named while Commander Vancouver is surveying the northern Pacific coast.

1835 - Is first recognized as a volcano.

1857-1980 - Is inactive.

May 18, 1980 - Erupts.

Fifty-seven people are killed. Damage caused by the blast costs $1.1 billion (USGS).

Hot ash causes forest fires, and snow melt from the top of the mountain causes floods.

Volcanic ash spreads across the Northwest. More than 900,000 tons of ash are cleaned up from areas around Washington.

The 1980 eruption is the first eruption in the continental United States outside of Alaska since 1917.

1980-1986 - Many small eruptions occur.

September 2004 - Several days of unusual seismic activity lead seismologists to believe that an explosion resulting from steam buildup is likely to occur.

October 2004 - Several small steam and ash explosions occur.

March 8, 2005 - Releases a column of smoke and ash nearly six miles high, leaving a plume visible for more than 50 miles.

January 2008 - Eruptions that have occured continously since October 2004 cease.

July 2014 - Final preparations begin for what geophysicists call the "equivalent of a combined ultrasound and CAT scan" of the inside of the volcano. The joint project by scientists at Rice University, the University of Washington, the University of Texas at El Paso and others involves placing 3,500 seismic sensors around the volcano. The project will take four years and aims to improve volcanic monitoring and advance warning systems.

November 3, 2015 - Scientists investigating the interior of the volcano present the first results at the Geological Society of America convention, saying there is not only a magma chamber directly below Mount St. Helens, there are other chambers east of the mountain that appear to be connected, with magma flowing between them.

Spring 2016 - Over the course of eight weeks, more than 130 small earthquakes occur beneath the surface of Mount St. Helens.

Mississippi Coronavirus Cases

Data is updated nightly.

Cases: 473413

Reported Deaths: 9214
CountyCasesDeaths
Harrison32339474
Hinds30703575
DeSoto29814346
Jackson23263336
Rankin21111358
Lee14600217
Madison14043265
Jones13165218
Forrest12953233
Lauderdale11418297
Lowndes10249175
Lamar10048128
Pearl River8737209
Lafayette8078136
Hancock7324111
Washington6837147
Oktibbeha6820118
Neshoba6404201
Monroe6372158
Warren6326161
Pontotoc610393
Panola6071124
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Marshall5972118
Union564086
Pike5491133
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George457868
Scott451993
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Itawamba436198
Tippah436180
Simpson4268111
Copiah425586
Wayne424863
Tate4234100
Adams4219114
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Marion4032100
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Newton364474
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Jasper310262
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Clay288273
Chickasaw282164
Clarke277487
Calhoun259739
Holmes259485
Smith243947
Yalobusha216747
Tallahatchie215649
Walthall205557
Greene204045
Lawrence203831
Perry196453
Amite193751
Webster191941
Noxubee174538
Montgomery169853
Jefferson Davis165541
Carroll159937
Tunica148434
Benton139433
Kemper137439
Claiborne125634
Choctaw124925
Humphreys123337
Franklin115227
Quitman101825
Wilkinson99835
Jefferson86632
Sharkey62120
Issaquena1916
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Alabama Coronavirus Cases

Cases: 764839

Reported Deaths: 13048
CountyCasesDeaths
Jefferson1089971721
Mobile698041173
Madison48181574
Baldwin35619445
Shelby35053289
Tuscaloosa32903508
Montgomery32475655
Lee21787203
Calhoun19941374
Morgan19234315
Etowah18509422
Marshall17217258
Houston16028347
St. Clair14866275
Limestone14059179
Elmore13943241
Cullman13942234
Lauderdale13030266
Talladega12307211
DeKalb11829226
Walker10171306
Autauga9439124
Blount9357149
Jackson9055136
Coffee8625157
Colbert8287164
Dale8241151
Escambia6436103
Tallapoosa6353166
Covington6291154
Chilton6215129
Russell590154
Franklin561294
Chambers5211130
Dallas4610176
Marion4579114
Clarke449471
Pike448289
Geneva4223102
Winston404685
Lawrence4040101
Bibb394776
Barbour337067
Marengo319979
Monroe310346
Butler308483
Pickens298369
Randolph291655
Henry291455
Hale285281
Cherokee278249
Fayette270671
Washington242645
Crenshaw231664
Clay220761
Macon213254
Cleburne208746
Lamar186339
Conecuh176538
Lowndes168756
Coosa162531
Wilcox153934
Bullock146842
Perry134035
Sumter122935
Greene118541
Choctaw72225
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Occasional areas of rain and some scattered thunderstorms will be in store for most of the weekend. However, good news by later sections of next week, as cooler and drier air will work its way into our weather forecast.
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