Earthquakes and Earth Structure 11

Earthquakes and Earth Structure 11 - Earth: From Inner...

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Earth: From Inner Space to Outer Space
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Figure 2.10
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Figure 2.8 Accretion of the Solar System
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Figure 2.9 Accretion of the Earth
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When? ( 4 January 1581 21 March 1656 ) October 23 , 4004 BC . Bishop James Ussher
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Cooling of the Earth Age ~24 million and 400 million years? http://en.wikipedia.org/wiki/Age_of_the_Earth Lord Kelvin (William Thompson) 1824-1907
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Heat from Radioactive Decay Current estimate of age of earth = 4.54 billion years Figure 2.14
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Age of the Earth • Oldest mineral on earth – 4,404 ± 8 Ma Zircon from Australia (http://en.wikipedia.org/wiki/Age_of_the_Earth) • Oldest rock on earth – 4,280 Ma Gneiss (http://en.wikipedia.org/wiki/Age_of_the_Earth • Moon rocks – ~4.5 Billion years bp (http://pubs.usgs.gov/gip/geotime/age.html) • Meteorites – ~4.53-4.57 Billion years bp (http://pubs.usgs.gov/gip/geotime/age.html )
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Age of the Universe? 13.5-14.0 billion years http://en.wikipedia.org/wiki/Age_of_the_universe
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Earth: Outside Looking In http://discovermagazine.com/2007/jun/journey-to-the-center-of-the-earth Light doesn’t penetrate very deeply
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Mechanical Waves (Echo Sounding)
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Seismic Waves and Seismographs
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http://www.earthscope.org / Wells Nevada, Feb 21, 2008 M= 6.0 Southern Sumatra, Sept 27, 2007 M= 8.4
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Seismic Waves http://www.uwgb.edu/dutchs/EarthSC202Notes/quakes.htm
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This note was uploaded on 04/03/2011 for the course EAS 1220 taught by Professor Brown during the Spring '08 term at Cornell University (Engineering School).

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Earthquakes and Earth Structure 11 - Earth: From Inner...

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