EARTHQUAKES

EARTHQUAKES - EARTHQUAKES A sharp release of energy...

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* A sharp release of energy resulting in a series of elastic waves propagated through the Earth at the moment of rupture along a fault. The rupture is initiated where stress along the fault exceeds the elastic limit of the rock so that sudden movement occurs. They are also associated with volcanic activity. * seismic waves: * transmission speed & direction can vary according to the Tº and density of the various layers within the planet ** Types of seismic waves : P wave (primary seismic wave) : a type of seismic wave, propagated like a sound wave, in which the material involved in the wave motion is alternately compressed & expanded S wave (secondary or shear seismic wave): a seismic wave in which particles vibrate at right angles to the direction in which the wave travels * L wave (surface wave) : a seismic wave that travels along Earth’s surface, but not through the Earth, and at slower velocities than either P or S waves
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EARTHQUAKES - EARTHQUAKES A sharp release of energy...

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