From October 2004 to late January 2008, about 92 million cubic meters (121 million cubic yards, or 36,800 Olympic swimming pools) of lava had erupted onto the crater floor— This would be enough to pave seven highway lanes three feet thick from New York City to Portland, Oregon— and is roughly equivalent to the volume …

How big was the Mt St Helens eruption in 2008?

From October 2004 to late January 2008, about 92 million cubic meters (121 million cubic yards, or 36,800 Olympic swimming pools) of lava had erupted onto the crater floor— This would be enough to pave seven highway lanes three feet thick from New York City to Portland, Oregon— and is roughly equivalent to the volume …

Did St Helens erupt in 2008?

Skamania County, Washington, U.S. The 2004–2008 volcanic activity of Mount St. Helens in Washington, United States has been documented as a continuous eruption in the form of gradual extrusion of magma. Starting in October 2004 and ceasing in January 2008, a new lava dome was built up.

What size eruption was Mt St Helens?

More than 1.5 million metric tons of sulfur dioxide were released into the atmosphere. On the Volcanic Explosivity Index scale, the eruption was rated a 5, and categorized as a Plinian eruption. The collapse of the northern flank of St. Helens mixed with ice, snow, and water to create lahars (volcanic mudflows).

What causes bulging like what happened in the Mt St Helens eruption?

A “bulge” developed on the north side of Mount St. Helens as magma pushed up within the peak. Angle and slope-distance measurements to the bulge indicated it was growing at a rate of up to five feet (1.5 meters) per day.

When did Mt St Helen erupt last?

Helens is located in the Cascade Range and stood 9,680 feet before its eruption. The volcano has erupted periodically during the last 4,500 years, and the last active period was between 1831 and 1857.

When did Mt St Helens erupt the second time?

Mount St. Helens began to erupt again in September 2004, with earthquakes, ash and steam plumes, and a dome-building lava flow. Eruptions are likely to continue in years ahead (photo by USGS/CVO – Vallance/Logan). The volcano was quiet from 1986 until September 2004, when swarms of small earthquakes began.

Did Mt St Helens erupt with lava?

Lava flows from Mount St. Helens typically affect areas within 6 mi (10 km) of the vent. However, two basalt flows erupted about 1,700 years ago extended about 10 mi (16 km) from the summit; one of them contains the Ape Cave lava tube. Sources/Usage: Public Domain.

Was there lava at Mt St Helens?

Lava flows from Mount St. Helens typically affect areas within 6 mi (10 km) of the vent. However, two basalt flows erupted about 1,700 years ago extended about 10 mi (16 km) from the summit; one of them contains the Ape Cave lava tube.

How far away was the furthest victim?

During the eruption, 57 people were killed. 7: How far away was the furthest victim? The farthest victim was about 13 miles away.

Will Mt St Helens erupt again?

We know that Mount St. Helens is the volcano in the Cascades most likely to erupt again in our lifetimes. It is likely that the types, frequencies, and magnitudes of past activity will be repeated in the future.

What happened to Mount St Helens in 2004?

Mount St. Helens 2004-2008 eruption: A volcano reawakens. Mount St. Helens reawakened in late September 2004. Small magnitude earthquakes beneath the 1980-1986 lava dome increased in frequency and size, and a growing welt formed on the southeast margin of the previous lava dome and nearby portions of Crater Glacier.

Why is it important to monitor Mount St Helens?

By monitoring Mount St. Helens, scientists are better able to understand the volcano’s behavior, to assess hazards and potential impacts, and to provide timely warnings of future events. The video was produced for a public event commemorating the 10th anniversary of the beginning of the 2004-2008 eruption.

What happened to the Cascades Volcano in 2008?

According to the USGS Cascades Volcano Observatory Website, “From October 2004 to late January 2008, about 125 million cubic yards of lava had erupted onto the crater floor to form a new dome.” In July 2008, after five months during which no new evidence of eruptive activity was detected, geologists declared the eruption over.