Mount St. Helens Case study revision 0.0 / 5 ? GeographyNatural hazardsGCSEOCR Created by: Sophie CarterCreated on: 21-04-13 15:54 Where did the Mount St. Helens eruption occur? Washington State, USA. In the Cascade Range of mountains. 1 of 11 When did the volcano eventually erupt? 18th May, 1980. 2 of 11 What filled spirt lake? Lava flow and ash blocking the channel of the Toule River. 3 of 11 How many people died? 61 people died- most from poisinous gases. 4 of 11 How fast did the pyrocalstic flow move? 300km/hr. 5 of 11 How many animals were killed? 7000 killed by volcanic ash nothing survived the 'blast zone'. 6 of 11 How fast did the Lahars flow? 35 metres per second. 7 of 11 How much did the US government send in aid? $951 million in aid to rebuild industry in the area and compensate people. 8 of 11 What improved due to ash deposits? Soil fertility. 9 of 11 What had boosted the local economy? The increase in tourism. 10 of 11 What has an increased risk? Flooding due to the new landscape. 11 of 11
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