1 / 29

Impact!

Impact!. Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay. The Solar System. Nine Eight Planets Over 100,000 catalogued asteroids ???? Centaurs ???? KBO’s (including one disgruntled ex-planet) Millions of Comets. The Hazard. It’s all about Kinetic Energy

seth-hughes
Download Presentation

Impact!

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Impact! Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay

  2. The Solar System • Nine Eight Planets • Over 100,000 catalogued asteroids • ???? Centaurs • ???? KBO’s (including one disgruntled ex-planet) • Millions of Comets

  3. The Hazard • It’s all about Kinetic Energy • K = ½ mv2 • 10 m block @ 30 km/sec = 100 Kt • Multiply size by 10, multiply K by 1000 • Comets (large v) have more energy

  4. Impacts on Earth

  5. The Impact Process • Atmospheric Entry • Contact-Compression • Penetration – Transient Crater • Excavation • Collapse

  6. Small Impacts Make Simple Pit Craters

  7. Recent Impact – Meteor Crater

  8. Medium Impacts Create Central-Peak Craters

  9. How Central Peaks Form

  10. Upheaval Dome, Utah

  11. Schrodinger: A Peak-Ring Crater

  12. Large Impacts Result in Multiple-Ring Basins

  13. Comets and Planetary History • Superposition • Crater Saturation • Crater Degradation

  14. Superposition

  15. Crater Saturation

  16. Crater Degradation

  17. Recognizing Craters on Earth • Craters rapidly destroyed by erosion • Circular geologic structures • Impact melts • Impact breccias • Shock metamorphism • Shatter cones

  18. Manicouagan, Quebec

  19. Sudbury, An Ancient Impact Site

  20. A Shatter Cone

  21. Fallback Breccia

  22. Mega-Impacts: As Usual, Gary Larson Gets There First

  23. How Did The Moon Form? • Co-Creation • Fission • Moon should orbit in Earth’s equatorial plane • Capture • Can account for plane of Moon’s orbit • Very hard to do in reality • Collision • Requires no skill at all

  24. Computer Simulations by H.J. Melosh (University of Arizona)

More Related