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Tsunamis

Page history last edited by catrin treanor 4 years, 8 months ago

Tsunamis are a secondary effect of earthquakes...

 

You must know a case study of a Tsunami: The Japanese Tsunami 11.3.11

 

 watch the moments it hit the shore.

 

  • Cause - you must include diagrams in your explanation
  • Effects
  • Response

 

 - use this table to get you started on effects and responses

 

 

The CAUSE    Follow this link to a BBC animation to find out what causes a tsunami   

The most powerful earthquake recorded in Japanese history, magnitude 9.0. The tremors were the result of a violent uplift of the sea floor 80 miles off the coast of Sendai, where the Pacific tectonic plate slides beneath the Eurasian Plate. Tens of miles of crust ruptured along the trench where the tectonic plates meet. The earthquake occurred at the relatively shallow depth of 15 miles, meaning much of its energy was released at the seafloor

 

As the Pacific plate moves down, it sticks to the overhead plate and pulls it down too. Eventually, the join breaks, causing the seafloor to spring upwards several metres. The plate tectonics of the region are complex, and geologists are not sure which plate Japan sits on. Candidates include the Eurasian plate, the North American plate, the Okhotsk plate, and the Honshu microplate.

 

 

 

Other links you can follow to extend your knowledge on effects and responses:

 

In numbers

 

ghost ship

 

The Guardian newspaper's reports

 

A comprehensive list of links to follow from the 'Geography in the News' webpages 

 

 

CH 4 Documentary on the Japanese Earthquake 2011

 

One year on  - 2012 anniversary

a BBC report from Otsuchi one year on - the response.

Japan is well-prepared for earthquakes and tsunamis...

Japan is arguably the world leader in readiness:

  •  the country marks Disaster Prevention Day on Sept. 1, the anniversary of the 1923 Tokyo quake.
  • At many Japanese schools, first-day-of-class celebrations include an evacuation drill.
  • Japan boasts the world's most sophisticated earthquake early-warning systems.
  • Emergency drills organized by public and private organizations work, among other things, to transport "stranded" commuters from their offices to their homes.
  • Japan's tsunami warning service, set up in 1952, consists of 300 sensors around the archipelago, including 80 aquatic sensors that monitor seismic activity 24/7. The network is designed to predict the height, speed, location and arrival time of any tsunami heading for the Japanese coast.
  •  Tsunami safety has been a focus of coastal city planning throughout the nation.
  • On Japan's east coast, where tsunamis frequently hit, hundreds of earthquake and tsunami proof shelters have been built. Some cities have built tsunami walls and floodgates so that the waves don't travel inland through river systems

(source:  http://www.time.com/time/health/article/0,8599,2059457,00.html)



Read more: http://www.time.com/time/world/article/0,8599,2058390,00.html#ixzz2BZl3uQPU

 

 

The Asian Tsunami 2004 - cause, effects and responses. Overview of the countries affected. lots of short video clips you can select from here

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