Case study: Eyjafjallajökull

What is the pH range of the water samples collected from the Jökulsá river?

• 5.45 to 6.94
• 6.94 to 8.45
• 4.20 to 5.45
• 4.20 to 5.45

What does the increase in pH of the water samples suggest?

• Less gas released from the magma
• More interaction between magma and water
• Decreased volcanic activity
• Increased geothermal activity

What is the connection between the CO2 concentration and earthquake frequency?

• CO2 concentration increases before earthquakes
• CO2 concentration decreases before earthquakes
• CO2 concentration remains constant during earthquakes
• CO2 concentration increases after earthquakes

When did the seismic activity under Eyjafjallajökull increase significantly before the eruption?

• 2010-03-04

• 2010-03-19

• 2010-03-31

• 2010-04-12

What type of magma was involved in the Fimmvörðuháls eruption?

• Basaltic lava
• Rhyolitic lava
• Andesitic lava
• Obsidian lava

How much tephra, or volcanic ash, was produced during the Fimmvörðuháls eruption?

• Less than 0.1 million cubic meters
• 1 million cubic meters
• 5 million cubic meters
• 20 million cubic meters

What was the concern regarding the Fimmvörðuháls eruption?

• Lava flow into Þórsmörk valley
• Ash plumes affecting aviation
• Increased seismic activity
• Interaction with water from glaciers

How long was the Fimmvörðuháls eruption before the summit eruption began?

• 1 day
• 1.5 days
• 2 days
• 2.5 days

What was the biggest danger in the first two days of the eruption?

• Earthquakes
• Flooding
• Ashfall
• Lava flow

Why did this eruption affect airplanes more than other eruptions in Iceland?

• It lasted a long time
• The ash was blown towards the planes
• It occurred during peak travel season
• The volcano was located near airports