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Mount St. Helens: How did the volcano "shake" itself after the earthquake? Science | News



On May 18, 1980, Mount St. Helens exploded in the USA, Washington. This measure, measured at 5 on the Volcanic Explosive Index, was declared to be the most catastrophic in modern US history. A huge column of volcanic material has risen 80,000 feet into the atmosphere, and ashes have been introduced in 11 countries, killing at least 57 people and damaging over 770 million pounds

. represents a threat from the time of its last period of activity in forty and thirteenth years.

However, during the documentary "The Fire Under Us," the Amazon Prime showed that a series of small earthquakes showed that magma again began to move below.

Series 1

995 showed: Mount St. Helens began on March 20th.

"It shook wakefulness with an earthquake up 4.1.

"During the next 29 days, the mountain continued to shake with hundreds of thrills.

"The frequency reached the maximum of March 25 from 22 significant earthquakes in one eight-hour period .

"In response to the growing threat, the forestry service began to evacuate staff and created the first closure zones and warned residents of the danger of earthquake-induced avalanches"

He showed how earthquakes became more frequent, and opened the second crater.

He added: "Then on March 27, the eruption of steam and ash opened a new crater on top of the summit, and the debut of the debut volcano in Washington.

"A few days later, the second, larger crater was formed next to the first."

"Then a terrible discovery – the north side of St. Helens deformed, creating a 200-foot high bulge that was

Not later, than in two months, May 18, there was some significant activity.

At 8:32 am an earthquake of magnitude 5.1 below the northern slope trigger ed this part of the volcano to slide about seven seconds after a push.

The landslide, the largest in recorded history, traveled at 110 to 155 mph and moved across the Western Lake of the Spirit.

The displacement subjected to a magnetism dacite in the neck of St. Helens at a much lower pressure, causing charged gas, partially molten stone and high pressure steam above it to erupt a few seconds after the onset of the shear.

The resulting blast laterally directed the pyroclastic flow of very hot volcanic gases, ash and pumice formed from a new lava, while a rough old stone occupied the earth – first moving at a speed of 220 km / h, but quickly accelerating to 670 mph [19659022] Passed through a moving avalanche and spread out, destroying a total of about 240 square kilometers of forest.

A huge ash cloud, emerging north of the northern foot of St. Helens, was visible around the surrounding areas.

A relatively supersonic lateral explosion, loaded with volcanic debris, caused devastation to 19 kilometers from the volcano.


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