Earthquake japan

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  • Created by: Sharon
  • Created on: 30-12-15 12:10
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  • Tohoku (Japan, March 2011)
    • Tectonic setting
      • 3 plates. Eurasian ,Pacific, Philippines. (pacific under Eurasian)
      • Destructive margin, faults run off boundry
      • island volcanic origin. 30% world quakes pa
      • 7.2 2 days before. build up strain energy. tsunami consequence
    • Magnitude
      • Biggest ever recorded. 9.0. epicentre 70km east Oshika. Hypocentre 32km deep.
    • Frequency
      • 7 foreshocks,  i1235 aftershocks many 7 and above. followed Omori law
        • number and size deckines with time from largest event.
      • 30% world quakes but this size rare.
    • Vulnerability
      • High vulnerable, people live on coast, mountainous spine.
      • Eastern seaboard (Honshu)  (Fukushima power plant)
    • Capacity to cope
      • high capacity for both. 40% coastline has sea wall 10m high.
      • hazard agency, prediction quakes and tsunami.
        • detected quake and issued tv warnings just after p waves before bad s waves.
        • tsunami oredict 3 minutes after 20 mins to get to safety - mobile network.
      • buildings designed to cope move with waves
    • Institutional capacity
      • Emergency crews & army on site-readily trained (yearly) result of Tokyo 1923
      • Huge GDP $34,000 2011 huge leeway for planning.
      • Japanese Meteorological agency - 200 seismographs, 600 intensity metres, collects from 3,600
      • issues info on hypocentre magnitude intensity -trigger for rescue.
    • Impact
      • tsunami most - 10km inland Honshu moved 2.4m east
      • several nuclear incidents, 3 meltdowns, contamination sea,land evac of residents >20km
      • death toll 15,854, 26,992 injured, 3,155 missing
      • 130,00 buildings cillapsed, 700,000 damaged-roads railways and fires.
      • 4.4m without electricity, 1.5m no water
      • World bank - $235 billion most expensive natural disaster ever.
      • Bank japan offered 15 trillion yen to normalize market. all ports closed 10% fishing damaged
    • Immediate response
      • many got outside, -response good for earthquake
      • 20 minutes insufficient warning escape
      • 340,000 displaced people needed catering shortage normal stuff
      • government sent self defense forces
      • Red cross $1B
    • Long term responsse
      • 6 days after motorway was repaired, response incredible

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