2004-2008 St Helens Eruptions
Mount St. Helens is an active stratovolcano found in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 154km south of Seattle, Washington and 80km northeast of Portland, Oregon. Mount St Helens is named after the British Diplomat and acquaintance of George Vancouver, Lord St Helens. Vancouver named the Area after his acquaintance after surveying the area in the late 18th century. The volcano is found in the Cascade Range and is part of the cascade volcanic arc, the particular region of volcanoes is known for its extravagant ash explosions and pyroclastic flows. The 2004-2008 eruptions of St Helens, Washington, Unites states has been recorded …show more content…
Activity of the Cascadia Fault is what had triggered the activity of St Helens in 1980 and in 2004. The Cascadia fault is a convergent plate boundary. The fault is a described as long and slopping, it starts in Northern Vancouver Island and expands down to Northern California. The Cascadia fault line separates the Juan de Fuca plate and the North American plate. Tectonic processes active in the Cascadia subduction zone region include accretion, subduction, deep earthquakes, and active volcanism of the Cascades. This volcanism has included such notable eruptions as Mount Mazama (Crater Lake) about 7,500 years ago, Mount Meager about 2,350 years ago, and Mount St. Helens in 1980. Major cities affected by a disturbance in this subduction zone would include Vancouver and Victoria, British Columbia; Seattle, Washington; and Portland, Oregon. The two tectonic plates involved in the subduction process at the convergent fault line are the Juan de Fuca plate and the North American plate. The Juan De Fuca plate being the denser oceanic plate is being subducted under the continental North American plate. Although the fault line is on the coast of the Northern American plate tectonic activity is also heavily present inland, evidence of this is the cascade volcanic arc formed by the tectonic movements at the fault …show more content…
One of the issues with geological features such as volcanoes is that it is impossible to know when it will become active again, we are only able to predict using the various technologies used to measure the different features of the volcano. The only thing communities can do is to be prepared for such an event. Things such as training the emergency rescue services in the area to be able to respond to an eruption or identifying the areas that are at high risk are things that can be done by the local community. The state government will have to be involved to make sure that the citizens are evacuated into a safe region and that there will be a steady food and water supply for them. The state/Federal government may also enlist the services of special emergency response teams specifically designed to deal with environmental disasters, these response teams may look to deal with the lava directly and divert away from the populated areas by spraying them with water or bombing them.
Mount St Helens is a mountain that must be kept under constant surveillance as it is located close to large towns, the Volcano has the potential to wipe out a lot of wild life and urbanized area, and therefore it is crucial that we use all instruments available to measure any changes that may indicate volcanic activity.
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On May 18th, 1980, Mount Saint Helen, a volcano in Washington erupted majorly. The eruption is the most studied volcano eruption. Mt. St. Helen was known as one of the most prestige volcanoes in the Cascade Range before its eruption on May 18, 1980. The eruption made a big blast that destroyed the northern part of the volcano, crushing millions of the trees below the mountain. The zone was further described as a big debris avalanche.
The Connecticut river valley was also formed from many rifts and faults that had developed. A rift valley is a region of lowland that forms where tectonic plates move apart, which is how the river valley was formed. On the other hand, the plate tectonics also formed the Appalachian mountains. The Appalachian mountains were formed by convergent boundaries, which is when two plates collide. The
These two plates push and shove each other causing small tremors throughout which can cause landslides,volcanic eruptions and once in a couple years, quakes with devastating results. The strongest earthquake recorded occurred in 1991 with a measure of 7.6 on the Richter scale. This earthquake left 4 dead and buildings as well as bridges and road were completely destroyed. If another Earthquake occurs, the coastal cities would be the most affected ones as they are closer to the plates.
On May 18th, 1980, thirty-five years ago, Mt St. Helens erupted and changed the course of history. This towering Washington volcano is part of the Pacific Ring of Fire. During the eruption the mountain spewed hot gases, rocks and, ash into the sky causing a mud flow down the mountain 's sides. According to the National Oceanic and Atmospheric Administration," this was the deadliest and most economically destructive volcanic event in the history of the United States".
El Chichón is often overlooked in comparison to other historic eruptions, yet the 1982 eruptions provide important lessons on preparation for volcanic disasters and the influence volcanoes can have on climate. The 1982 eruption of El Chichón is the largest
The hot material deep within the surface of the Earth melts to produce magma beneath the Pacific Plate. Each of the volcanoes in the Hawaiian island chain go through a series of stages in their lifetime. In short, the shield stage, postshield stage, erosional stage, rejuvenated stage, coral atoll stage, and the guyot stage. The shield stage is divided into three phases, the submarine, explosive, and subaerial. Following the gentle explosions of the pre shield stage, the submarine phase begins with pillow lava eruptions.
little movement from the tectonic caused big things such as earthquake, but what exactly is San Andreas Fault? San Andreas fault is major fracture of the Earth’s crust in extreme western north America (Brittanica). San Andreas fault have caused so many earthquakes in U.S.A, causing many destruction, and causing lost of lifes. Now, What made Northridge Earthquake so destructive? While the Northridge earthquake was happening Californian people couldn’t predict it (u-s-history.com).
At 3:11 p.m. the next day, an 8.5-magnitude quake hit southern Chile. The epicentre of this powerful tremor was off the Chilean coast under the Pacific Ocean, as the Nazca oceanic plate was subducted 50 feet down under the South American plate. The earthquake caused huge amounts of debris to slide down the mountains of the region. It was also the reason for a series of tsunamis of the coast of Chile (This Day In History, 2009).
There are many natural disasters that affect the world, for example, volcanoes. Mount St. Helens is known to be the most active volcano in the Cascade Range in Washington; effecting the people and the state. It was first recognized as a volcano in 1835! Before the eruption on May 18,1980, Mount St. Helens was a beautiful symmetrical cone, 3,000 meters above sea level. For most of the 20th century, many people viewed this mountain and recreation area as a beautiful and peaceful place, but after the volcano erupted in 1980 that view point was shattered.
Yellowstone is located in the middle of the North American Plate. In addition, both places have different types of crust. Hawaii has oceanic crust; Yellowstone has continental crust. This means that oceanic crust is lower in the ground. Continental crust is higher then oceanic crust.
Earthquakes are the biggest threat to Juneau. The city has a history of very violent earthquakes. The earthquakes in Juneau are caused by crustal stress accumulated by the North American and Pacific plates. The city also experiences activity from the Queen Charlotte-Fairweather fault system. This fault system has caused large earthquakes in the past.
Mauna Loa has 2 trails to get to the top, which is Ancient times (First Ascent) and Ainapo (Easiest Route). The last time it erupted was in 1984. Mauna Loa is a shield volcano which traditionally it doesn’t produce a lot of violent eruption. It began by a slow 3-year period of a slow increase of an earthquake beneath the volcano. It started on March 25, 1984 between 1:25 and
REVIEW OF LITERATURE INTRODUCTION-History of Kilauea Kilauea has been constantly erupting since 1983 and has not stopped! It is around 4,000 feet tall or 1,219 meters above sea level. It is part of the main land of Hawaii and takes up about fourteen percent of the land. By 1995 five-hundred acres were covered with cooled lava which is within twelve years or eruption. When Kilauea was formed it was formed by a hotspot which is when hot magma breaks through the center plate.
Throughout geologic history, tectonic plate boundaries have diverged, converged and transformed the Earth, causing the surface of the Earth to be in a constant state of change. Plate tectonics, at present, is observed only on the Earth and “refers to a particular mode of convection in a planetary mantle, which is made of silicate rocks” (Korenaga 2012, p. 87). The lithosphere of the Earth is divided into plates which move at different velocities over the mantle, with much of the Earth’s seismic and volcanic activity occurring when these different plates interact at plate boundaries. Volcanic activity, therefore, occurs at two types of plate boundaries: mid-ocean ridges and subduction zones. Plate tectonics also influence the evolution of the