Conversations with the Earth Tom Burbine [e-mail]

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Conversations with the EarthTom
Burbinetburbine_at_framingham.edu
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Midterm

• March 24
• Covers everything including Tuesday-Wednesday
  class
• You can bring in a sheet of paper with anything
  written on it
• You can bring in your hand-written mineral sheets

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Review Session

• Wednesday evening at 430 pm in Hemenway 229

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• A 9.0 magnitude earthquake occurred on March 11th
• Where?

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• Aftershock is a smaller earthquake that occurs
  after a previous large earthquake, in the same
  area of the main shock
• Formed as the crust around the displaced fault
  plane adjusts to the effects of the main shock.

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Richter Scale Magnitude

• Logarithmic
• logarithm of the amplitude of waves recorded by
  seismographs
• each whole number increase corresponds to an
  increase of about 31.6 times the amount of energy
  released

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How to imagine changes in Richter Scale
Magnitude?
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• How did the Japanese seismic warning system give
  residents an 80 second warning that an earthquake
  would hit Japan?

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• The boundary between Okhotsk Plate and Pacific
  Plate is a subduction zone
• The Pacific Plate subducts beneath the Okhotsk
  Plate
• Pacific Plate is the largest tectonic plate

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• http//news.sciencemag.org/scienceinsider/2011/03/
  japan-earthquake-makes-waves.html

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• The quake moved portions of northeast Japan by as
  much as 2.4 meters closer to North America
• A 400-kilometer stretch of coastline dropped
  vertically by 0.6 m

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http//manusrivastava.instablogs.com/entry/what-ca
uses-a-tsunami
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Tsunami

• Series of water waves caused by the displacement
  of a large volume of a body of water

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• http//www.bbc.co.uk/news/world-asia-pacific-12769
  741
• http//www.bbc.co.uk/news/world-asia-pacific-12778
  552
• http//www.youtube.com/watch?vLrS1ITc2yF4

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• http//uk.ibtimes.com/articles/124586/20110319/jap
  an-tsunami-earthquake-fukushima-noaa-dart-videos-p
  hotos-graphics.htm

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• What is a Supermoon?

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• Full or new moon that coincides with a close
  approach by the Moon to the Earth

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• Did Supermoon cause Japanese earthquake?

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• Supermoon occurred March 19th
• Earthquake occurred March 11th
• http//news.cnet.com/8301-17938_105-20044993-1.htm
  l?tagmncoltxt

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• Tides are strongest at full and new moons

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• The earthquake and tsunami knocked out the
  regular and backup cooling systems at the
  six-reactor Fukushima Daiichi nuclear power plant

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• Radioactivity decay of an atomic nucleus
• All elements with an atomic number greater than
  82 (lead) are radioactive

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• Half-Life time it takes for half of an amount
  of radioactive material to decay

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Any Questions?