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It's said that the amount of light reaching the lake's water is so small, that you can't see your hand if you dunk it tino the water

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This image shows the result of the avalanche that destroyed the forest around Spirit Lake

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David Alexander JOhnston was an American USGS volcanologist who was killed by the eruption. He had been investigating the volcano for a long time, and was the first person to notice the eruption.
This image was taken 13 hours before his death.

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Being the most devastating eruption in North American history, the eruption column rose 24 km into the atmosphere, and deposited ash in 11 U.S. states. The eruption caused the biggest avalanche in global history, that, with a speed of 177 to 249 km/h, destroyed the landscape of an area of 62 km2. The Lake Spirit is covered with trees, railroad and highways were destroyed, ash covered massive amounts of land. It all together caused 3.03 billion dollars in damage.

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This is a graph showing the earthquakes during the eruption of the volcano.

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It’s a volcano located in the Skamania County, in the state of Washington (United States).

It’s 96 miles (154 km) south of Seattle, and 50 miles (80 km) northeast of Portland.

It’s part of the Pacific Ring of Fire, the the most active volcanic region on the earth.

It’s located on the North American plate on a convergent boundary.

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Human and economic consequences of the eruption

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Human and economic consequences of the eruption

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The eruption killed 57 people(four of them were indirect), in the lateral blast, ashfall, and lahars. The causes to death included asphyxiation, thermal injuries, and trauma. Also 200 homes were destroyed or damaged.

For a limited time, some people living near the eruption suffered from post traumatic stress syndrome: depression, troubled sleep, irritability, ans a sense of powerlessness.

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Ancestral stages of eruptive activity: The first eruptions, called Spirit Lake Stage, took place from 40.000 to 8.000 years ago.

After sleeping for 4.000 years, a volcano stage called “The Smith Creek and Pine Creek eruptive periods” started.

The new era called Castle Creek and Sugar Bowl eruptive periods started around 400BCE, putting an end to the previous one.

The Kalama and Goat Rock periods go from 1480 until 1980, when the latest eruption took place.

The modern eruptive period goes from the eruption in 1980 until nowadays.

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The eruption was caused by an earthquake. The earthquake caused the entire weakened north face of the mountain to slide away, creating the largest landslide ever recorded. This allowed the partly molten, high-pressure gas- and steam-rich rock in the volcano to suddenly explode northwards, towards Spirit Lake, in a hot mix of lava and pulverized older rock, overtaking the avalanching face.