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Unveiling Earth's Layers: Seismic Wave Velocity Analysis

Explore how differences in density and physical properties influence seismic wave velocity in Earth's crust and layers. Discover fascinating insights into plate tectonics and the structure of our planet.

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Unveiling Earth's Layers: Seismic Wave Velocity Analysis

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  1. “100% Exciting!”

  2. Izmit Turkey Seismogram

  3. Granite (and Average Continental Crust) 6.0 km/sec 2.5 km/sec 3.5 km/sec 3.0 km/sec Differences in density and other physical properties affect the velocity of seismic waves.

  4. Oceanic Crust: P-wave Velocity = 7 km/sec “Basalt” Continental Crust: P-wave Velocity = 6 km/sec “Granite”

  5. P-wave Velocities Crust 6-7 km/sec Mantle 8-13 km/sec Outer Core 8-10 km/sec Inner Core 10-11 km/sec

  6. speed of light in a vacuum = 300,000,000 m/s speed of light in glass = 200,000,000 m/s From:www.what-is-the-speed-of-light.com

  7. Slow Fast Slow Fast

  8. Travel-time versus Distance Curves T D Distanced measured in degrees from epicenter. D

  9. Travel-time versus Distance Curves D Distanced measured in degrees from epicenter.

  10. P-wave reflected from Core-Mantle Boundary PcP

  11. Slow Fast

  12. Fast Slow

  13. Fast Slow

  14. “Moho” Andrija Mohorovicic Zagreb Seismological Observatory 1909

  15. “Moho” Andrija Mohorovicic Zagreb Seismological Observatory 1909

  16. Inner Core discovered by Inge Lehmann in 1936 Copenhagen Seismological Observatory

  17. Inner Core discovered by Inge Lehmann in 1936 Copenhagen Seismological Observatory

  18. Low Velocity Zone in Upper Mantle

  19. Low Velocity Zone in Upper Mantle Low Velocity Zone = Asthenosphere of Plate Tectonics

  20. Mechanism of Plate Tectonics

  21. P-wave Velocities Crust 6-7 km/sec Mantle 8-13 km/sec Outer Core 8-10 km/sec Inner Core 10-11 km/sec

  22. “A Must-See Movie!”

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