Volcanoes

• Volcanoes


  • Formed by converging plate
  • Rift valley
• Volcano types


  • ACEGALE
  • Sounaahes
  • Cruss maria
  • Vas fsnols
• Vas fsnols


  • Flat, runny
• Convergent boundaries


  • Oceanic crust
• Beniare zone


  Where friction, near, melting (granite, basaltic) is high
• Abicid


  Volcanoes
• Volcanoes


  • Eyja janaiskuli
  • Licevanal
• Runny lava


  Diverging plate
• Diverging plate volcanoes


  • Not explosive
• Diverging plate volcanoes


  • Icelander or site
• Diverging plate volcanoes


  • +1000°C
• Subduction zone


  Predictable
• Volcanoes


  • Mt St Helens
  • Volcansei Strassicano (composite)
• Composite volcanoes


  • Explosive
• Magma chamber


  Explosive
• Volcano


  Hazards
• Volcano hazards


  • Lahars (secondary hazard)
  • Mudflows of volcanic material
  • Flooding
  • Ash and tephra fall
  • Pyroclastic flows
  • Acid rain
• Volcanic eruption


  Reduces agricultural production
• Volcanic eruption


  Causes suffocation
• Volcanic eruption


  Destroys everything
• Volcanic eruption


  Causes floods from sudden release of water/glacial ice
• Volcanic eruption


  Causes acid rain that damages crops, forests and aquatic ecosystems
• Basaltic magma eruptions are most hazardous in large quantities
• Pyroclastic flows are hot rock fragments, lava particles and hot gases that move close to the ground
• Lava domes can simply boil out of the crater
• Mt. St. Helens


  Volcano
• 57 deaths


  May 18th, 1980
• Mt. St. Helens eruption

  • Composite cone volcano
  • Plinian eruption
• Eruption of Mt. St. Helens

  1. Ash-breathing moment

  2. Death

  3. Pecat

  4. Walls

  5. Trees
• Pyroclastic flows


  • Highly destructive
  • Mudflows
• Pyroclastic flows


  Destroyed Evening Landslides - largest in history
• Evacuation of the area around Mt. St. Helens
• Ash damage to highways and buildings
• Eyjafjallajökull


  Volcano in Iceland
• 30 deaths


  May 2010
• Eyjafjallajökull eruption


  • Plinian eruption
  • Ash cloud reached Jet Stream
  • Caused floods, stopped flights, trade, and coal
• Nevado del Ruiz


  Volcano in Colombia
• 23,000 deaths


  1985
• Nevado del Ruiz eruption


  • Occurred in a heavily populated Catholic area
  • First major eruption in over 100 years
• Nevado del Ruiz is located at a destructive plate boundary