Impacts of volcanic activity

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  • Created by: cconnor09
  • Created on: 29-03-17 14:38
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  • Impacts of Volcanic Hazards
    • Social-Individuals, families and communities
      • 200,000 deaths in last 500 years
        • Lower than other hazards due to prediction, evacuation, diversion/ steering of lava
        • Secondary impacts- famine (Iceland- Skaftar fires) 25% pop died
      • Over crowding and lack of water and supplies.
      • Homelessness and refugees.
        • 1991- Mt Pinatubo eruption displaced 100,000 people. Ashfall- houses collapsed and houses buried farmland
        • Lahars in the river valleys for months after eruption. Aeta tribal people had to abandon homes on slopes of Pinatubo. Lowland areas- refugee camps-young and elderly died of diseases
      • Psychological issues- people may not be able/ want to return
    • Economic- Infrastructure damage and costs to agriculture, industry and government
      • Negative for regions economy- linked to social impacts
      • Lava destroys houses, factories, bridges, farms etc
      • Lahars, ash falls and jokulhlaups  can destroy a wider area. Destruction of commercial areas, forestry, tourist amenities
      • Mt St Helens- 600km2 of trees. Montserrat- 7000/11000 pop evacuated. Cost Britain £100 million
      • Decreased production and employment
    • Environmental- landscape, ecosystem and climate
      • Change landscapes- look lunar
        • After Krakatoa- 1883- 300m mountain became 300m deep submarine crater.
        • Mt St Helens- landslide reduced height by 400m
      • Death of vegetation and animal life.
        • Pinatubo-1991- over 1million farm animals died
      • Impact global climate-
        • 1815- cold summer, crop failures and famine- killing millions- due to eruption of Mt Tambora- indonesia
        • Mass extinctions in past due to series of volcanic eruptions
        • Dust fills upper atmosphere, reduces insolation

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