hazards content

• park disaster response curve

  shows the effect a disaster on quality of life / varying effects over time and how responses progress during a disaster

  pre disaster

  disruption

  relief

  rehabilitation

  reconstruction
• hazard management cycle

  4 stages:

  mitigation

  prepardeness

  response

  recovery
• 3 theories of tectonic movement

  slap pull

  ridge push

  convection
• what is ridge push


  constructive plate boundaries

  magma rises up between plates and cools while being pulled down and outwards due to gravity - away from the margin

  this causes pressure on the tectonic plates and gravity causes them to pull apart
• what is the asthenosphere

  part of the mantle , semi - molten
• what plate is subducted


  the denser one , oceanic
• volcanic eruptions as constructive

  basaltic lava

  hot and viscous (runny)

  often non violent eruptions

  e.g. Iceland
• volcanic hazards at destructive plate margins

  andesitic and rhyolitic lavas cooler and more viscous

  often more violent as lava builds pressure at subduction zones
• volcanic hazards


  lahars

  pyroclastic flows(nuee ardente )

  lava

  ash and fallout (tephra)

  acid rain

  volcanic gases
• examples of volcanic hazards

  eyjafjallajokull

  Monserrat
• can you predict a volcanic eruption?

  no but authorities can prevent the land around volcano from being developed
• where do earthquakes occur

  all 3 plate margins
• earthquake hazards


  tsunamis

  landfall/landslides

  panckaking

  liquefaction
• what is the epicentre

  point in which earthquake originates / is first felt on land above the focus which is where the earthquake originates

  the deeper the focus the higher magnitude