There are several hazards associated with Mt. Saint Hellen’s. Lava domes, lahars, pyroclastic flows,
There are several hazards associated with Mt. Saint Hellen’s. Lava domes, lahars, pyroclastic flows,
It was one of the most deadly eruptions in America. Mt. Saint Helens height used to be 9,677 ft making it the 5th highest peak in Washington. It’s height was reduced to 1,300 ft after it exploded in 1980. Mt. Saint Helens is almost 53 km west of Mt. Adams and approximately 80 km Northeast of Vancouver, Washington.…
4.Mount St. Helens Has produced four major explosive eruptions since 1479, and dozens more smaller eruptions.Producing pyroclastic flows,lava flows, and lahars. During the past 4,000 years, Mount St. Helens has erupted more frequently than any other volcano in the Cascade Range. Volcanic mudflows filled rivers with rocks, sand, and mud, damaging 27 bridges. Over the course of 17 episodes, lava eruptions began filling the crater, building a lava dome that reached 876 feet above the crater floor.…
Helens, a stratovolcano, is located in Southwestern Washington. It is ranked 5 on the explosivity index. The eruption at Mount St. Helens was triggered by an earthquake that occurred at 8:32 am on the eighteenth of May, 1980. Scientists had been monitoring seismic activity for months before the eruption. When the volcano erupted, over 230 square miles were within the direct blast of the eruption. All 230 miles were completely totaled. Hot mud, which was moving at over 90 miles per hour, which cleared away everything that was in its path. The volcano, which used to be a symmetrical cone that stood at about 9,600 feet tall, is now horseshoe shaped and only stands at 8,300 feet tall. The landscape has been permanently altered since that day. More than 200 homes were destroyed in the blast. Over 185 miles of roads and over 15 miles of railways were also destroyed. Ash was blasted out of the volcano at over 650 miles per hour. Nearly 540 million tons of that ash drifted and settled over 2,220 square miles, reaching across seven states before finally ending in Minnesota. The cost to repair all of the damage caused by the eruption cost well over 1.1 billion dollars. It is considered to be the most destructive volcano in the United…
Covering over 85% of Hawaii, Mauna Loa meaning long mountain, is the earth's largest volcano. Located on the main island of Hawaii, Mauna Loa pushes 12 million cubic meters of lava into Hawaii each day. It rises over 4 km above sea level. But, below the sea, it drops another 5km to the sea floor which is then indented another 8km under the weight of this giant land form. This means the total height of this volcano is a whooping 17km high from the base of the volcano to the crest. It is amid the earth's most currently active volcanos with its most recent eruption in 1984 being both extremely beautiful and destructive. It has been documented erupting 33 times between 1843 and 1984 at 5-6 year intervals and scientists currently expect an eruption…
Overview To all the residents in the village of Boomsdale, recently Dr. Bigbrain with the United States Geological Survey (USGS) has detected small earthquakes coming from Mt. Thunder. For those of you that do not yet know, Mt. Thunder is an active stratovolcano and these earthquakes could be related to an impending volcanic eruption. There are three types of volcanos which include: shield volcanos, scoria cone volcanos, and stratovolcanoes. Unfortunately, stratovolcanoes are the most dangerous, explosive, and deadly volcanoes. The reason for stratovolcano’s explosive tendency is because of the type of magma contained in the volcano’s magma chamber located underground beneath Mt. Thunder.…
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 show that the impacts vary from volcano to volcano, place to place.…
Beginning in the year 62 CE, violent earthquakes rocked the region, warning of volcanic activity. The eruption, beginning that fateful August morning, lasted over 24 hours. The eruption was the first one ever recorded in history. An explosion came from the mountain and fine ash fell on the…
First, we will discuss Mount St. Helens Volcano. Mount St. Helens is a stratovolcano located in the Pacific Northwest of the United States within Washington State. A stratovolcano is also known as a composite cone, which is “a large symmetrical structure that consists of alternating layers of explosively erupted cinders and ash interspersed with lava flows (Lutgens, 2012.)” Due to the cone shape of the volcano, stratovolcanoes are known for creating large explosive eruptions that can eject vast amounts of pyroclastic material. Mount St. Helens is a part of the Pacific Ocean Ring of Fire that spans across the ocean along the shorelines of continents that are located along the ocean. Within the Ring of Fire the mountain range which Mount St. Helens is a part of in the United States is called the Cascade Range. Of the 13 active volcanoes that are a part of the Cascade Range, Mount St. Helens is one of the more active volcanoes with its last major eruption occurring in May 1980 (Lutgens, 2012.)…
Mount St. Helens, in Washington States, violently erupted. At 8:32 A.M. a 5.1 magnitude earthquake struck about one mile below the mountain, causing the largest landslide in history. The snow and ice moved at speeds of more than 175 miles per hour and removed over 1300 feet from the summit, sweeping away almost the entire North side of the mountain. The landslide raised temperatures about 60 degrees higher than usual. There was a lot of ash that came out of the volcano when it erupted as well. The ash caused a major problem to the townspeople because it contaminated the oil systems, clogged air filters, and scratched any moving surfaces, like cars and other vehicles. Particularly small, finer ash particles caused electrical shorts in transformers. This caused town wide blackouts. Also, the elevation of the mountain dropped from 9677 feet to 8363 feet. It decreased more than 1300…
The United States contains in its history the most significant volcanic eruption to occur in the lower forty-eight states. When Mount St. Helen's erupted, the effects were seen by many, and scientists were fascinated with learning about the volcano. Much research was conducted looking into the economic, ecological, and personal aspects of the eruption. Mount St. Helens proves to be a memorable landmark to all Americans and still a source of fascination today for a variety of persons.…
Has anyone in your family every been in a natural disaster? If you have how bad was it, do you think it was as bad as hurricane Katrina. Or was it a small disaster. In the past 4,000 years, Mt. saint Helens has erupted more than the other Cascade Range volcanoes. 3,600 years ago the Native Americans had to abandoned their hunting because of the enormous eruption that was four times as enormous as may 1980’s eruption. When it erupted in 1980 the ash rose over 80,000 feet.…
On May 18th, 1980 in the state of Washington of the United States Mount St. Helens erupted sending volcanic ash, steam, water, and debris to a height of about 60,000 feet. Fifty-seven people were either killed or went missing after the eruptions. Before the big eruption in 1980 there was minor eruptions in 1898, 1903, and 1932.…
The most recent eruptive period was in the 1980’s. Due to USGS (United States Geological Survey) geologists observations of a large bulge measuring 140m on the north face of the volcano. Using modern laser and radar technology they were able to track the movements of this bulge in order to predict when the volcano was in danger of erupting from a an observation tower 6 miles away. With this data collected the authorities were convinced to shut off the volcano to the local populations who make use of the volcano’s fertile soil for a large logging business and many recreational users who walk dogs or come to enjoy the views. As will be shown later, the shutting of the volcano saved many local thousands of tourists, workers and locals lives alone.…
Imagine you're one of the people that decide to ignore the officials warnings of an eruption on Mount St. Helens. It's May 18, 1980, 8:32 a.m. and you hear a rumble and feel the earth move. Behind you, you hear a thunderous noise. When you turn around, you see a humongous landslide headed your way. Mount St. Helens in Washington State has erupted, immediately a cloud of gas, rock, and hot ash shot up in the air and race down the mountainside at an unimaginable speed. The eruption created a mass of destruction, which effected many people locally and worldwide. The environment in the area was forever changed.…
The landward side of the andesite line has explosive eruption as it is located at subduction zones while the seaward side is locate at oceanic ridges. The explosiveness of the eruption has to do with the flow of the magma and for the landward side the magma originated from the subduction zone. This zone has magma that are of high viscosity, they are granitic-andesitic and excrude at 700-9000c, have thick short flows that has slaggy surface, they cover large distance at slow pace to be specific 10m/hr on flat surface and 100m/hr on slopes. They are said to be explosive because they have ash associated with the eruptions as well as being acidic at times. With this type of magma a variety of eruptions can occur all of which are explosive. Some of these include strombolian ,vulcanian and vesuvian, plinian and pelean eruptions. Strombolian eruptions are of short…