Mount St Helens 0.0 / 5 ? GeographyNatural hazardsGCSEOCR Created by: Tom HoultonCreated on: 07-02-16 13:32 Where is Mount St Helens? Washington, NW USA 1 of 20 When was the eruption? 18 May 1980 8.32am 2 of 20 How fast did the landslide travel? 670 mph 3 of 20 How many died? 57 4 of 20 How many homes were destroyed? 200 5 of 20 How many roads were destroyed? 300km 6 of 20 What amenities were people left without? clean water, electricity and sewage removal 7 of 20 List 3 economic impacts? 15 square km timber destroyed, farm crops destroyed, 12 million salmon killed in hatcheries 8 of 20 What was the overall cost of the eruption? $1.1 million 9 of 20 How long were commercial flights cancelled for? 2 weeks 10 of 20 List 3 environmental impacts? 60,000 square km covered in ash, wildlife killed, water polluted by debris 11 of 20 List 3 long term responses? Roads and bridges repaired, people re-housed, forests re-planted 12 of 20 List 3 short term responses? Medical supplies for injured, helicopters rescued survivors, dust masks issued 13 of 20 What plans have been made in case of future eruptions? Emergency services trained, evacuation plan prepared, scientists monitor quakes, gases and temperatures 14 of 20 How many people were rescued? 200 15 of 20 Which way direction the lateral (sideways) blast go? North 16 of 20 What kind of plate boundary is there? Subduction (destructive) 17 of 20 What is the posh name for the mud flows? Lahars 18 of 20 What is the posh name for the hot ash cloud? Pyroclastic flow 19 of 20 What are the names of the two plates? Juan de Fuca and North American 20 of 20
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