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Understanding the Earth's Interior: Structure, Layers, and Seismic Insights

Explore the Earth's internal structure through the lens of geophysics and seismic wave analysis. From the core to the crust, delve into the distinguishing features of the Earth’s layers, including the liquid outer core and solid inner core, as well as the composition of the mantle and crust. Learn about P-wave and S-wave shadow zones, the Mohorovicic discontinuity, and the mantle's lithosphere and asthenosphere. This comprehensive examination reveals how seismic reflection and refraction provide crucial evidence about our planet's inner workings.

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Understanding the Earth's Interior: Structure, Layers, and Seismic Insights

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Presentation Transcript

  1. The Earth’s Interior

  2. The Earth’s Interior • Most of what we know is from geophysics

  3. Evidence from Seismic Waves • Seismic Reflection • Seismic Refraction

  4. Earth’s Internal Structure • The Core • P-wave Shadow Zone • S-wave Shadow Zones • Liquid Outer Core • Solid Inner Core

  5. S-Wave Shadow Zone

  6. Earth’s Internal Structure • The Earth’s Crust • Continental crust- sial • Less dense and thicker than oceanic crust • Oceanic crust- sima • Mohorovicic discontinuity

  7. P-Wave Velocities & Boundaries Moho

  8. Earth’s Internal Structure • The Mantle • Ultramafic Rock • Lithosphere • Crust & uppermost mantle • Asthenosphere • Low velocity zone • Lower mantle

  9. Earth’s Internal Structure • Composition of the Core • Made of metal • The Core-Mantle Boundary • Convection in both core and mantle

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