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Earthquakes

Earthquakes. 1906 San Francisco Earthquake. What is an earthquake?. Quick release of energy caused by movement along faults which are cracks in the earth’s crust Energy is released in the form of seismic waves. 3 Types of Waves. P-Wave = P rimary wave S-Wave = S econdary wave

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Earthquakes

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  1. Earthquakes

  2. 1906 San Francisco Earthquake

  3. What is an earthquake? • Quick release of energy caused by movement along faults which are cracks in the earth’s crust • Energy is released in the form of seismic waves

  4. 3 Types of Waves • P-Wave = Primary wave • S-Wave = Secondary wave • L-Wave = Love wave

  5. 1. P-Waves • Primary Waves • Pressure wave • Pushing and Pulling of rock within the earth • Fastest Waves (arrives First) • Travels through solid AND liquid • Travels through the Earth (not along the surface)

  6. 2. S-Waves • Secondary Waves • Shear wave • Side-to-Side, like a Snake • Travels through Solids only • Travels through the Earth (not along the surface)

  7. 3. L-Waves • Love waves – named after A.E.H. Love • RoLLing wave; up and down or side-to-side movement • Slowest wave; Last to arrive • Travels aLong the surface of the Earth **** CAUSES THE MOST DAMAGE ****

  8. Seismograms

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