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Natural Disasters

Natural Disasters. By: Patrick L. Abbott. Chapter 15. Impacts with Space Objects. Overview. Impact Scars Sources of Extraterrestrial Debris Rates of Meteoroid Influx Crater-Forming Impacts The Cretaceous/Tertiary Boundary Event Problems for Life from Impacts. Overview (cont.).

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Natural Disasters

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  1. Natural Disasters By: Patrick L. Abbott

  2. Chapter 15 Impacts with Space Objects

  3. Overview • Impact Scars • Sources of Extraterrestrial Debris • Rates of Meteoroid Influx • Crater-Forming Impacts • The Cretaceous/Tertiary Boundary Event • Problems for Life from Impacts

  4. Overview (cont.) • The Crater-Forming Process • Impact Origin of Chesapeake Bay • Biggest Event of the Twentieth Century • Biggest “Near Events” of the Twentieth Century • Frequency of Large Impacts

  5. Impact Scars • Maria • Astroblemes

  6. Sources Of Extraterrestrial Debris • Shooting Star • Asteroids • Comets • Oort Cloud • Perihelion • Aphelion • Solar Wind • Sublimates

  7. Rates of Meteoroid Influx • Cosmic dust • Shooting Stars • Meteorites

  8. Crater-Forming Impacts • Meteor Crater, Arizona • Coesite • Stishovite • Shatter Cones

  9. The Cretaceous/Tertiary Boundary Event • Evidence of the K/T Impact • Site of the K/T Impact • Angle of Impact

  10. Problems for Life from Impact • Earthquake • Wild Fires • Nitrogen Oxides • Dust and Soot • Water Vapor and CO2

  11. The Crater-Forming Process • Speed and Size • Temperature • Shock Wave • Release Wave • Rising Center • Fracture Walls

  12. Impact Origin of Chesapeake Bay • Size and Age • Tektites

  13. Biggest Event of the Twentieth Century • Tunguska, Siberia, 1908 • Description of Event • Damage Inflicted

  14. Biggest “Near Events” of the Twentieth Century • 22 March 1989 • 19 May 1996 • The Year 2028

  15. Frequency of Large Impacts • Long-term Record of the Moon • Earth’s Generated Numbers • The Probabilities • A Defense Plan

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