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Download Linking Asteroids and Meteorites through Reflectance
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Conversations with the Earth Tom Burbine [email protected] 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 Review Session • Wednesday evening at 4:30 pm in Hemenway 229 • A 9.0 magnitude earthquake occurred on March 11th • Where? • 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. 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 How to imagine changes in Richter Scale Magnitude? • How did the Japanese seismic warning system give residents an 80 second warning that an earthquake would hit Japan? • 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 • http://news.sciencemag.org/scienceinsider/2011/0 3/japan-earthquake-makes-waves.html • 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 http://manusrivastava.instablogs.com/entry/what-causes-a-tsunami Tsunami • Series of water waves caused by the displacement of a large volume of a body of water • http://www.bbc.co.uk/news/world-asia-pacific12769741 • http://www.bbc.co.uk/news/world-asia-pacific12778552 • http://www.youtube.com/watch?v=LrS1ITc2yF4 • http://uk.ibtimes.com/articles/124586/20110319/j apan-tsunami-earthquake-fukushima-noaa-dartvideos-photos-graphics.htm • What is a Supermoon? • Full or new moon that coincides with a close approach by the Moon to the Earth • Did Supermoon cause Japanese earthquake? • Supermoon occurred March 19th • Earthquake occurred March 11th • http://news.cnet.com/8301-17938_105-200449931.html?tag=mncol;txt • Tides are strongest at full and new moons • The earthquake and tsunami knocked out the regular and backup cooling systems at the sixreactor Fukushima Daiichi nuclear power plant • Radioactivity – decay of an atomic nucleus • All elements with an atomic number greater than 82 (lead) are radioactive • Half-Life – time it takes for half of an amount of radioactive material to decay Any Questions?
