Mt St Helens

Question 1

When was the eruption

Answer 1

18 May 1980

Question 2

Where is Mt St Helens

Answer 2

In the South of the state of Washington

Question 3

How many deaths

Answer 3

57

Question 4

Height before eruption

Answer 4

9,677 feet

Question 5

Height after eruption

Answer 5

8,363 feet

Question 6

When did the volcano go dormant

Answer 6

1850

Question 7

What economic activity was the most prevalent on the volcano

Answer 7

Logging

Question 8

When did the volcano become slowly active

Answer 8

January 1980

Question 9

What showed the growing pressure in the volcano

Answer 9

Bulge growing on North side due to magma rising from a fault

Question 10

What was the impact of this growing threat on scientists and tourists

Answer 10

Scientists became highly concerned yet tourists were attracted

Question 11

When was a state of emergency declared and why

Answer 11

3 April 1980

To keep the tourists away from the volcano

Question 12

Who was allowed in the Red Zone

Answer 12

Law enforcement and scientists

Question 13

Who was allowed in the wider Blue Zone

Answer 13

Loggers

Question 14

Why was there anger around the danger zones

Answer 14

Some wanted stronger action (loggers wanting security and safety when working)

Some wanted less harsh restrictions (wanting to return home)

Question 15

Magnitude of earthquake that triggered the eruption

Answer 15

5.1

Question 16

What did the earthquake cause

Answer 16

Entire north side of the volcano slipped in the largest landslide in recorded history

Question 17

How fast did the landslide travel

Answer 17

155mph

Question 18

VEI

Answer 18

5

Question 19

How much sulphur dioxide was released

Answer 19

1.5 million tonnes

Question 20

Category

Answer 20

Plinian

Question 21

Why was the affected area so much larger than predicted

Answer 21

The eruption was a lateral blast, so covered a huge amount of land to the north, rather than the predicted small area around the whole volcano

Question 22

How much land did the pyroclastic flow destroy

Answer 22

600km²

Question 23

How far away were some trees burned

Answer 23

Over 30km

Question 24

What did airborne ash particles cause

Answer 24

Lightning, which triggered many forest fires

Question 25

How high were the ash clouds

Answer 25

23km

Question 26

Impacts of ash in the air

Answer 26

Pollution of water supplies
Killing livestock
Restricting air traffic

Question 27

What did ash settling on glaciers cause

Answer 27

It liquefied them, causing jökulhaups to destroy property and many bridges

Question 28

What happened with the jökulhaups?

Answer 28

They travelled 27km into the Columbia River
3,000,000m³ of material was transported
They blocked many rivers and damaged aquatic habitats

Question 29

What was destroyed

Answer 29

200 homes
47 bridges
185 miles of road
15 miles of railway
Many forests

Question 30

Recovery within a year

Answer 30

Many of the bridges and roads rebuilt
900,000 tonnes of ash removed from roads
Routes into other areas reestablished
Logging restarted

Question 31

What happened in 1980 - 1986

Answer 31

Numerous smaller eruptions

Question 32

What happened in the early 2000s

Answer 32

Lots of activity, with eruptions of steam and ash, as well as new lava domes forming in the crater of the volcano

Question 33

How did scientists use the event

Answer 33

To research how plants and animals could recover after a disaster such as this