St. Helens released an amount of energy equivalent to 27,000 Hiroshima-sized nuclear weapons and ejected more than 1 cubic mile (4 km³) of material. A quarter of that volume was fresh lava in the form of ash, pumice, and volcanic bombs while the rest was fragmented, older rock. The removal of the north side of the mountain (13% of the cone's volume) reduced St. Helens' height by about 1,313 feet (400 m) and left a crater 1 to 2 miles (2 to 3 km) wide and 2,100 feet (640 m) deep with its north end open in a huge breach. More than 4 billion board feet (14.6 km³) of timber was damaged or destroyed, mainly by the lateral blast.
Downwind of the volcano, in areas of thick ash accumulation, many agricultural crops, such as wheat, apples, potatoes, and alfalfa, were destroyed. As many as 1,500 elk and 5,000 deer were killed, and an estimated 12 million Chinook and Coho salmon fingerlings died when their hatcheries were destroyed. Another estimated 40,000 young salmon were lost when they swam through turbine blades of hydroelectric generators when reservoir levels were lowered along the Lewis River to accommodate possible mudflows and flood waters.
The ash fall created some temporary but major problems with transportation, sewage disposal, and water treatment systems. Visibility was greatly decreased during the ash fall, closing many highways and roads.
Over a thousand commercial flights were cancelled following airport closures. Fine-grained, gritty ash caused substantial problems for internal-combustion engines and other mechanical and electrical equipment. The ash contaminated oil systems and clogged air filters, and scratched moving surfaces. Fine ash caused short circuits in electrical Transformers, which in turn caused power blackouts.
There were also indirect and intangible costs of the eruption. Unemployment in the immediate region of Mount St. Helens rose tenfold in the weeks immediately following the eruption By Nii Lomotey Engmann
The 1980 eruption of Mount St Helens was a VEI 5.
It is told that the eruption of 1980 could be heard all around the world
Mt. St. Helens did not have lava flow during its 1980 eruption. Instead, it underwent a catastrophic lateral blast that expelled hot ash, steam, and debris. The eruption resulted in a massive eruption column and pyroclastic flows.
FALSE
how many days did it take for the ash get in the air from the eruption from mt st Helens in 1980
The 1980 eruption of Mount St. Helens.
Mt St Helens first erupted on May 18, 1980
About 2 cubic km of material was erupted. About the size of the Mt St Helens eruption in 1980.
57 People died in the eruption.
The 1980 eruption of Mount St Helens was a VEI 5.
explosive
people died
fireweed
omg es teal
United States, Washington.
Mt. St. Helens benenfited humans by the rock from lava are used to build and repair roads in this day!
On May 18th 1980.