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Earthquake Notes

Earthquake Notes

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Earthquake Notes

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Presentation Transcript

  1. Earthquake Notes

  2. Elastic Rebound

  3. Elastic Rebound

  4. Fault and Joint • Fault: • Joint:

  5. Faults

  6. San Andreas Fault

  7. Focus & Epicenter

  8. Seismograph

  9. Seismograph

  10. Foreshocks & Aftershocks

  11. Earthquake WavesSeismic Waves • Body Waves • Primary Wave: • Secondary Wave:

  12. Earthquake WavesSeismic Waves • Surface Waves

  13. Seismic Waves • Seismic WavesVideo • Recent Seismic Activity http://quake.usgs.gov/recenteqs/Anim/index.html

  14. Earthquake Intensity Scales • Mercalli: • Measures the amount of damage done at each location

  15. Earthquake Intensity Scales • Richter • Measures the amount of energy released at the focus of the earthquake. Richter TNT for Energy Yield (approximate) 1.0 30 pounds Large Blast at a Construction Site 2.0 1 ton Large Quarry or Mine Blast 3.0 29 tons 4.0 1,000 tons Small Nuclear Weapon 5.0 32,000 tons 6.0 1 million tons 7.0 32 million tons, Largest Thermonuclear Weapon 8.0 1 billion tons San Francisco, CA Quake, 9.0 32 billion tons 10.0 1 trillion tons 12.0 160 trillion tons (Fault Earth in half through center, OR Earth's daily receipt of solar energy)

  16. How common are earthquakes?

  17. What is the ultimate cause of earthquakes?

  18. Where do most earthquake occur?