Mount St. Helens

Mount St. Helens last erupted on May 18, 1980, making it around 41 years old since its most recent eruption. However, the actual age of the volcano itself is over 40,000 years old, with its first-known eruptive activity dating back to about 40,000 years ago.

Some birds that lived on Mount St. Helens before the eruption in 1980 included the northern spotted owl, northern goshawk, and varied thrush. These birds inhabited the diverse habitats of the mountain, ranging from forested areas to alpine meadows.

Mt. St. Helens has had several different styles of eruptions through its history. The types of eruptions vary from explosive to dome building.

The explosive history of Mt. St. Helens is relatively well known from the May 18, 1980 eruption that captured world attention at the time. The eruption style was typical of this volcano, pyroclastic flows and lahars were both generated. The flank collapse was more than likely a result of the earthquake under the flank at the time, and is believed to have been the trigger of the eruption itself.

Dome building eruptions have been the most common types of eruptions since the 1980 explosive eruption. There have been several lava domes generated since the summit eruption that generated the crater.

Although they have not been witnessed in historical time, Mt. St. Helens does have a history of passive lava eruptions out of flank vents. This type of eruption although it hasn't been witnessed in a rather long time, it is believed that these types of eruptions have been just as common if not more common than the explosive eruptions we have seen in historical times.

Mount St. Helens is located along the Cascadia Subduction Zone, where the Juan de Fuca Plate is subducting beneath the North American Plate. This subduction zone is a convergent plate boundary, resulting in the volcanic activity that built the mountain and led to its catastrophic eruption in 1980.

One surprising research finding about the aftermath of the eruptions of Mount St. Helens was the speed at which plant and animal life started to rebound and recolonize the devastated area. Scientists were amazed at how quickly ecosystems began to recover, with new plant growth appearing within weeks and new species of insects and animals returning within years. This rapid recovery challenged previous notions about the resilience of nature in the face of such catastrophic events.

The crater at Mount St. Helens is about 1.2 miles (1.9 km) in diameter. It was created during the catastrophic eruption in 1980, which also caused the summit of the mountain to collapse.

If you're talking about mt st Helens then it last erupted on 1st October 2004, but it is most notorious for its catastrophic eruption on 18th May 1980 at 8:32 am.

So about 7 years. =)

The 1980 eruption of Mount St. Helens did not produce lava flows. It was an explosive eruption that prudiced an ash plume and pyroclastic flows. Pyroclastic flows are avalanche-like masses of superheated ash, rock, and gas. Pyroclastic flows from the initial lateral plast reached as far as 19 miles. Ash blown high into the atmosphere was carried by the wind for thousands of miles.

Some of the immediate responses to the Mt St Helens eruption in 1980 were....

Mobilising helicopters to search and rescue those in the vicinity of the catastrophic blast.

People setting up emergency treatment in nearby towns as they were closer than having to go to the hospitals

Face masks were sent from the US when they all ran out. President Carter sent 2 million more over.

It was triggered by an earthquake measuring 5.1 on the Richter scale, caused an eruption, reducing the elevation of the mountain's summit from 9,677 ft (2,950 m) to 8,365 ft (2,550 m) and replacing it with a 1 mile (1.6 km) wide horseshoe-shaped crater. The earthquake was caused by a sudden surge of magma from the Earth's mantle. The debris avalanche was up to 0.7 cubic miles (2.9 km3) in volume.

Plug dome volcanoes typically eject viscous magma, which is known as rhyolite lava. This lava is thick and flows slowly, leading to the formation of steep-sided domes as it cools and hardens. As a result, plug dome volcanoes tend to have explosive eruptions due to the high pressure build-up of gas within the viscous magma.

No they are not alike. guess you would want to know the answer... ... Here is the reason, because different volcano have different forms of volcanoes and erupting. there are 2 different forms of volcanoes, 1 active and non active. There are also 2 forms of erupting methods too, 1 slow and fast. If the volcano erupts fast, you would not be able to escape it if you are near it. But if the volcano erupts slowly, you might have a chance to escape it even though you are near. (But slow or fast is not the thing that matters most nor if it is active or not. The most important thing is the ashes! If you breath in to much ashes, you would die or suffocate),this is just for eduacational use.

It can take several decades to centuries for Mount St. Helens to develop into a climax community. The speed of recovery depends on various factors, including the severity of the eruption, the availability of nearby vegetation and seeds, and the ecological processes involved in succession.

A mountain forms around a volcano because each volcanic eruption can release large amounts of lava and other volcanic materials, which can accumulate over time and gradually build up the height and size of the volcano. With each eruption, new layers of lava and ash are added to the existing structure, creating a larger and taller mountain over time.

Strong tremors indicating magma flow, aleted athorities that something was about to happen.

No one forsaw the amount of destruction that happened.

Look for quotes by a man named Harry Truman. ( Not the president )

Magma gets pushed through a vent due to the build-up of pressure beneath the Earth's surface. As the magma rises, it creates fractures in the rocks above, eventually reaching the surface through the vent. This process is driven by the buoyancy of the magma and the force of gas expansion within it.

It could poison the atmosphere with ash and smoke and destroy countless numbers of trees and forests and animal life.

After the eruption of Mount St. Helens in 1980, the landscape was drastically altered, with vast areas of forest destroyed, leaving behind acres of barren land covered in ash and pumice. The eruption also caused the formation of a large crater at the summit of the volcano, which eventually filled with water to create a new crater lake. The surrounding ecosystem underwent a process of recovery and regeneration, with new plant life gradually colonizing the devastated areas.

Mount St. Helens is located on the mainland in the state of Washington, USA. It is part of the Cascade Range of mountains.

Mount St. Helens is monitored by the United States Geological Survey (USGS) using a network of seismometers, GPS stations, gas sensors, and web cameras. This monitoring helps scientists detect any signs of potential volcanic activity and keep the public informed of any changes in the volcano's behavior.

The swineherd wishes for Helen's whole race to be destroyed because she brought about the Trojan War, which caused immense suffering and loss of life. He blames Helen for the destruction and chaos that ensued, and sees the elimination of her race as a way to prevent further harm from coming to the world.

The population of Mount St. Helens, a census-designated place, decreased from around 2,950 residents before the eruption in 1980 to approximately 2,550 residents after the eruption. The eruption caused widespread destruction, including the loss of homes and infrastructure, leading to a decline in population in the area.

The Mount St. Helens cryptodome was caused by the intrusion of magma beneath the volcano, creating a bulge in the surface as pressure built up. This bulge eventually collapsed, triggering a massive eruption in 1980 that devastated the surrounding area.

It is likely that Mount St. Helens will erupt again in the upcoming years, and unfortunately, there is no way to prevent this occurrence. However, when an eruption is impending, the USGS will provide short-term forecasts and warnings. This way, people in the area will be able to evacuate.