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05 human impacts day surface processes 5


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05 human impacts day surface processes 5

  1. 1. PHYSICAL SCIENCE Human Impacts
  2. 2. Bell Ringer Think about the disaster cause by the lahar in Armero, Columbia.What led to such a spectacular failure?
  3. 3. Objectives ForToday: •Today’s essential questions: 1.)What types of hazards make up surface processes? 2.)How can we forecast their occurrences and reduce their negative impacts?
  4. 4. Agenda/Notifications •Bell Ringer •Determining mitigating processes •Surface Hazards •Quiz on Friday •If you haven’t taken your test yet,YOU NEEDTO! People are waiting to get their tests back!Tests taken after Friday are an automatic 10% off.
  5. 5. Surface Hazards •Remember: •Surface Processes: •Hazards that stem from actions above the earth’s surface
  6. 6. Surface Hazards: Landslides
  7. 7. Surface Hazards: Landslide Facts Why do you think Eastern Ky/West Virginia have high landslide hazards? Steep Slopes High weathering (Hot/Cold) Mining for coal High urbanization in the Eastern US
  8. 8. Surface Hazards: Landslides Similar to the Earthquake-Volcano connection, Landslides are sometimes connected toTsunamis. • Subaerial Landslides can lead to massive local tsunamis. • Subaerial landslides occur when a landslide falls into a body of water, creating a wave. EX. Lituya Bay, 1964. Landslide createdTsunami with 1000 ft. wave. • Submarine landslides lead to smaller tsunamis.These occur under water. • EX. Resurrection Bay, 1964. Landslide created 30ft tsunami that wrecked some oil tanks which then caught fire and spread into the bay.Then the earthquake generated tsunami hit, which took the form of a 40ft wave…that was ON FIRE.This completely destroyed the port town of Seward, AK. • Glacial calving can also lead to local tsunamis.
  9. 9. Concept Mapping What is a concept map? Take 5 minutes to work on your own – we will discuss as a group later. If you are struggling, raise your hand and explain where you are stuck. Terms to include: Surface processes Landslide Tsunami Subaerial landslide Submarine landslide Glacial calving
  10. 10. Surface Hazards:Tsunamis
  11. 11. Surface Hazards:Tsunami need-to-knows •The Indian OceanTsunami of 2004 killed 230,000 people. Let that sink in. •Pro tip: If you are on vacation, and water recedes quickly from the shoreline, RUN. Oftentimes before a tsunami strikes, water is pulled back hundreds of meters.This is called drawback •The first wave of a tsunami is usually NOT the biggest. Bigger and Bigger waves continue to come in. •About 80% of tsunamis occur in the “Ring of fire” •Scientists can accurately estimate the time when a tsunami will arrive almost anywhere in the world
  12. 12. Hang On…Wait a minute… •Wait!You said they can be accurately predicted!Why did 230,000 people die? •High population in fast growing Asian areas •NOTSUNAMIWARNING SYSTEM in the Indian Ocean •We have aVERY precise warning system in the PacificOcean where 85% ofTsunamis occur…but lack of funding and disinterest slowed implementation elsewhere •Almost ZERO public education and awareness. Indigenous people had almost zero knowledge of tsunamis.