Pinatubo - gd prediction

Question 1

Hazards

Answer 1

• 9 hour long eruption, releasing gas and ash which rose 20 miles
• pyroclastic flows @ 80km/h

Question 2

Causes

Answer 2

• 7.7 earthquake allowed basalt to squeeze into magma chamber
• reacted w magma causing increase in pressure which blew dome away

Question 3

Impacts

Answer 3

• $700 million in dmage
• 650k lost jobs
• 75k homes destroyed
• 350 killed (locals who didn’t want to move)
• 20 million tonnes of sulphur dioxide released, reducing global temps by 0.5 degrees
• mudslides covered 50k hectares, destroying crops

Question 4

Prediction

Answer 4

• scientists forecast eruption, saving 5k lives as well as property
• commercial aircraft warned but some jets sustained damage
• hazard zonation maps circulated a month before

Question 5

Prep and post event

Answer 5

• 200k evacuated
• new lahar monitoring working evac system
• engineering work to divert lahar flows to protect settlement (expensive)