Mount St Helens Volcano 1980

Let’s begin with Mount St. Helens which is located in the pacific northwest of the United States. To be more specific it is located in Washington State and is a part of the Cascade mountain range that spans from California to Canada. It is a composite volcano, which has steep sides that are formed by alternating layers of lava

A volcano is an earth hazard that occurs on faults between tectonic plates on a destructive boundary and an eruption is a natural disaster. A primary impact happens immediately after the disaster and before any response like death or collapsing or destruction of buildings. A secondary impact occurs later after the disaster, such less farm produce or a reduction in tourism. The severity of these impacts will differ considerably in a MEDC and LEDC where volcanic eruptions have taken place. These may be seen in the Mount St. Helen volcano eruption as well as in the Iceland volcanic eruption. They may also

Imagine being on an island when all of a sudden an ear-shattering boom reverberates around you. On August 27, 1883, 10:02 in the morning, Krakatoa erupted with immense force on a modern-day Indonesia island. Almost a century later, Mount Saint Helens, located in the state of Washington, erupted at 8:30 a.m., on May 18, 1980. Although Mount Saint Helens and Krakatoa had a lot of distance from each other, they were both composite volcanoes. Composite volcanoes produce a thick lava that causes a lot of damage.

There are many differences between the volcanoes for example the explosivity of the two volcanoes most recent eruptions are completely different Kilauea is almost constantly flowing and has virtually no explosions at all it also has low viscosity lava flows running from it constantly where as MT st Helens is completely different in MT st Helens most devastating eruption in 1980

During this eruption, hot vapors escaped at temperatures around 1,800 degrees Fahrenheit. Ash was blown out and covered tens of thousands of miles in volcanic dust. When the initial magma chamber was finally emptied much of the roof to the chamber caved in causing a caldera that measures 45 miles long by 28 miles wide. Then the magma resurged form two domes. There are some lava flows that are just 70,000 years old, which is not very old in geologic time. This leads to questions as to whether the Yellowstone volcano is still active. Seismic studies show that shock waves from explosions and earthquakes travel through the Earth’s crust but is slowed when it passes under a caldera. There are areas under the caldera where the seismic velocity is slower than normal. There are spots where the slowdown occurs within depths as shallow as 1 mile. This may be because there is molten lava in the crust. There are other locations that indicate there is even more magma beneath the surface as deep as 100 miles. Seismic activity also indicates that there is magma beneath the crust in the mantle. Uplift is also occurring at about ½ and inch per year

“1980 Eruption of Mount St. Helens.” American Disasters: 201 Calamities That Shook the Nation, Checkmark Books, 2008, pp. 370–372.

It was May 18th, 1980. The eruption of Mount St. Helens occurred in Washington,United States. The exact time it had happened is at 8:32:17. The eruption happened 96 miles out South of Seattle, Washington and 50 miles northeast of Portland,Oregon. Many people died during this time. About 50 people had died. 250 homes were destroyed. Along with 47 bridges, 15 miles of railways, 185 miles of highway was also destroyed. Many tiny earthquakes had happened a couple days before the eruption had happened.

Feel free to stretch, it's been a long ride. We will be stopping by a restaurant later to get some lunch. In front of you, you can see Humphreys Peak, the tallest mountain in the San Francisco Peaks. The San Francisco Peaks is actually a volcanic mountain range and is part of the San Francisco volcanic field. The peaks were once a stratovolcano but is now eroded and are the remains of the volcano. It is the only stratovolcano in the San Francisco Volcanic Field. The tallest mountain, Humphreys Peak, is about twelve thousand, six hundred and thirty-three feet in elevation, which is also three thousand, eight hundred and fifty-one meters tall. In fact, Humphreys Peak is the tallest point in all of Arizona. Also in this area, are more than six hundred volcanoes. Most of the volcanoes found here are basalt cinder cones. These volcanoes are relatively small. They are also usually less than one thousand feet in elevation. Another fact about these basalt cinder cones is that they are formed within a range of a couple of months to a couple of years. The San Francisco Volcanic Field also has several lava domes. Lava domes are formed by dacite and rhyolite magmas. Both of those types of magma are very rich and high in silica. So, as a result, the dacite and rhyolite magmas are very viscous and thick. As a matter of fact, the magmas are so viscous is thick that when volcanoes erupt, the magma tends to pile up and form very steep sided masses, which are the domes.

On May 18th, 1980 one of the worst volcanic eruptions occurred in the United States. Triggered by an earthquake, Mount St. Helens erupted in Washington State at 8:39am. According to the National Oceanic and Atmospheric Administration, it was "the deadliest and most economically destructive event in the history of the United States." There were many effects from this terrible, natural event. People, animals, and the environment were all effected.

It goes on to explain some of the Europeans to first record the sighting of the mountain which happened May nineteenth seventeen ninety-two during the surveying of the northern Pacific Ocean. It was named by Vancouver for a British diplomat, "1st Baron St. Helens," on October twentieth seventeen ninety-two, but before this local Indians had already named it louwala-clough or smoky mountain. In eighteen twenty-nine Hall J. Kelley led a campaign and planned to rename this mountain and all others after one of the United States president, he had tried to rename Mt. St. Helen to Mount Washington. As horrible as the explosion in May og nineteen eighty claimed lives the paper says if the explosion had waited just one day later on Monday rather Sunday when all the people were at work such as loggers they believe the death poll would have been much more higher. A second eruption was noted to had occurred on may twenty-fifth, noone was thankfully hurt and a rather popular film was then created named The Eruption of Mount St. Helen. After all that occurred with the volcano and all it put everyone through president Ronald Reagan in nineteen eighty-two established the Mount St. Helens National Volcanic Monument, which still to this day remains a famous natural laboratory for the study of earth processes,nature, and catastrophes. The volcano and the area surrounding still have a long way to go before it recovers and has all the things it had

May 18, 1980 was a day that dawned sunny and beautiful. Mt. St. Helens stood out beautifully against the blue sky. The mountain had been rumbling quite a bit the past few days, and geologists were watching it carefully and monitoring vibrations. There had been a series of earthquakes from around March 12, up until present day. Over 170 earthquakes hit that were higher that 2.5 on the Richter scale in that short period of time. The earth shook with an earthquake that hit 5.0 on the Richter scale, at around 8:32 in the morning. That did it. Mount St. Helens blew apart with the force of over 500 times more powerful than the atomic bomb. The lateral blast traveled at over 300 miles an hour, and destroyed 230 square miles of forest in just 3 minutes.

The first historic eruption of Santa Maria was the second largest volcanic eruption in this century. It was the third large explosive eruption in 1902. Mount Pelee and Soufriere of St. Vincent erupted six months earlier.” It also states that “The 1902 eruption of Santa Maria lasted 19 days.” Latitude: 14.76, Longitude: -91.55, Elevation: 3772, Country: Guatemala, Type: Stratovolcano.

Mount St. Helens Location: Washington, United States Latitude: 46.20 N Longitude: 122.18 W height: 2,549 meters or 8,364 feet - 9,677 feet before May 18, 1980 Type: Stratovolcano Number of eruptions in past 200 years: 2-3 Latest Eruptions: Between 1660-1700, around 1800-1802, 1831, 1835, 1842-1844, 1847-1854, 1857, 1980-? Present thermal activity: strong steaming Nickname: Mount Fuji of the West Remarks: continuous intermittent activity since 1980 with occasional eruptions of steam and ash; occasional pyroclastic flows; intermittent dome forming. MSH is considered a young volcano that developed over the last 40,000 years and is one of the most active volcanoes in the Cascade Range. Geologists predicted that the

However, the Romans living in Southern Italy did not take the earthquakes as a sign of future danger because Mount Vesuvius had not been active since 8 BC, and they were left with a false sense of security. In 79 AD, the pressure in the volcano had built up again and the layer of lava within the volcano could not contain the gasses. For several days before the eruption, there had been tremors that could be felt in the surrounding area. When the eruption occurred, a large ash plume made an umbrella shaped cloud about 30 kilometres above the area (Klemetti). In addition to having a complex geologic process prior to the eruption, Mount Vesuvius had a great effect on its geological surroundings.

Ash plumes and steam rose into the bright blue sky as the underground earthquake shook the land and rattled windows all across the eighteen mile town. As the jet circled the island, in view of lovely beaches and emerald water, looming over this lush paradise was the screaming volcano. Volcanos erupt when the pressure inside of them becomes so great that the magma surges up and forces its way out. An exploding volcano can rip apart a mountain in just seconds, when the eruption is over, a landscape is changed forever. The united states is home to more volcanos than any other country except Indonesia, and Japan. The majority of these volcanoes are in Alaska. Until recently, there was no way to predict when a volcano would blow, although volcanoes give off many warning signs before they erupt. Including smaller earthquakes beneath the volcano, slight inflation, or swelling. The rising magma eventually causes the solid rock to break, sending earthquake signals. Most volcanoes give warning signs beginning weeks or months before they blow (Lindop).