The blast and the landslide (debris avalanche) removed the upper 396 m (1,306.8 ft) of the volcano. The blast devastated 596 square kilometers (229 square miles) and destroyed timber valued at several millions of dollars. The photograph in the poster shows Mount St.
What was Mount Saint Helens blast radius?
The 600 km2(230 mi2) devastated area was blanketed by a deposit of hot debris carried by the blast. Sources/Usage: Public Domain. Plinian eruption column from May 18, 1980 Mount St. Helens.
How far was the Mt St Helens eruption felt?
(AP) — Mount St. Helens erupted yesterday with a violence blast that blew 600 feet off its summit. the eruption was felt 200 miles away, belching ash and hot gas that blotted out the sun for more than 100 miles. At least nine people were killed.
What is the diameter of Mt St Helens?
About 3,500 feet
The blast cloud traveled as far as 17 miles northward from the volcano and the landslide traveled about 14 miles west down the North Fork Toutle River.
Lava Dome Dimensions.
| Elevation of top of dome | 7,155 feet |
|---|---|
| Height | 876 feet above 1980 crater floor |
| Diameter | About 3,500 feet |
| Volume | 97 million cubic yards |
How wide and deep is the crater of Mt St Helens?
View is looking south into the crater of Mount St. Helens formed by an enormous landslide on May 18, 1980. The newly-formed crater is about 2 km wide (east-west), 3 km long (north-south), and about 600 m deep.
How far away were trees blown down Mt St Helens?
Within 10 kilometers (6.2 miles) north, it didn’t matter whether the trees were on the near or far sides; the blast cloud “followed topography, eroding timber as it slowed down into each valley and up over each succeeding traverse ridge.” Where it passed, the trees were simply gone, leaving behind nothing but shattered
How far did the ash spread from Mt St Helens?
During the 9 hours of vigorous eruptive activity on May 18, 1980, about 540 million tons of ash from Mount St. Helens fell over an area of more than 22,000 square miles (57,000 square kilometers).
How far away was the furthest victim from Mt. St. Helens?
During the eruption, 57 people were killed. 7: How far away was the furthest victim? The farthest victim was about 13 miles away.
How much bigger would the Yellowstone than Mt. St. Helens?
The three caldera-forming eruptions at Yellowstone (2.1 million years ago, 1.3 million years ago, and 640,000 years ago), were respectively about 2,500, 700, and 1,000 times larger than the 1980 eruption of Mt. St. Helens in the state of Washington.
How far can ash travel from a volcano?
Bottom Line: Volcanic Ash Can Travel 10,000s of Miles!
How far volcanic ash travels depend on a variety of factors, but ash from powerful volcanos have hovered in the atmosphere for years, traveling 10,000s of miles.
How big was the bulge on the northern face of Mount St. Helens?
450 feet
Helens underwent a catastrophic and deadly eruption, triggering the largest landslide ever recorded. Earlier in the year, thousands of small earthquakes, venting steam, and a growing bulge protruding 450 feet (140 m) indicated that magma was rising in the volcano.
How big was the 1980 eruption of Mount St. Helens?
22,000 square miles
During the 9 hours of vigorous eruptive activity on May 18, 1980, about 540 million tons of ash from Mount St. Helens fell over an area of more than 22,000 square miles (57,000 square kilometers).
How big was Mt St Helens eruption compared to atomic bombs?
In total, Mount St. Helens released 24 megatons of thermal energy, seven of which were a direct result of the blast. This is equivalent to 1,600 times the size of the atomic bomb dropped on Hiroshima.
Where is the largest crater on Earth?
Johannesburg, South Africa
At roughly 62 miles (100 kilometers) in diameter, the Vredefort crater, located near the present-day city of Johannesburg, South Africa, is the largest and oldest-known impact crater on the planet.
What is the deepest crater on Earth?
The Vredefort impact structure /ˈfrɪədəfɔːrt/ is the largest verified impact structure on Earth. The crater, which has since been eroded away, was around 160–300 km (100–200 mi) across when it was formed.
How deep was the deepest ever recorded volcano?
But in May of 2009, scientists captured the deepest ocean eruption ever found. Nearly 4000 feet below the surface of the Pacific Ocean – in an area between Samoa, Fiji and Tonga – the West Mata volcano was discovered.
How long did it take to clean up after Mount St. Helens?
Mount St. Helens: 40 Years of Recovery | Earth And The Environment.
Did they know Mt St Helens was going to explode?
In 1980, Mt St. Helens’ continued seismicity warned scientists at monitoring stations that the volcano might erupt, but the danger zone around the mountain turned out to be much too small.
Did any plants survive Mount St. Helens?
Plants such as willow, vine maple, and black cottonwood were able to re-sprout from roots protected in moist soil. Those plants are called survivors, and they were very important to the re-initiation of plants on the barren landscape. Some snow-protected Pacific silver fir and mountain hemlock trees also survived.
How far did Mt St Helens pyroclastic flow travel?
Pyroclastic flows from the May 18, 1980, eruption ran out no farther than 8 km (5 mi) from the vent. During the past 4,000 years, numerous pyroclastic flows are known to have traveled at least as far as 10 to 15 km (6 to 9 mi) and one older flow reached 20 km (12 mi) from source.
How far would Yellowstone eruption ash reach?
The eruption could be expected to kill as many as 90,000 people immediately and spread a 10-foot (3-meter) layer of molten ash as far as 1,000 miles (1,609 kilometers) from the park.