by: Ronald Garcia


external image kobe_earthquake.jpg
Princeton dictionary defines earthquakes as "shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity ".
Many earthquakes are formed because a series of foreshocks that lead to a large shock called an earthquake.
Aftershock: Following an earthquake aftershocks may hit within at least the following two days.
Intensity of these quakes may diminish as time passes. The reason why aftershocks occur is because after plates have collided for the initial shock, their sides still need to adjust to their new surfaces, and therefore they rub against each other and create a series of smaller sized shocks


Waves that act like soundwaves, they compress and expand. external image pwave.jpg


Shears the rock sideways at right angles to the direction of travel, therefore it cannot propagate in the liquid parts of the earth, such as oceans and lakes.
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The ground moves from side to side in a horizontal plane.
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Depending on where the wave is traveling Rayleigh waves will move both vertically and horizontally in a vertical plane towards that direction.
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Earthquakes are the main cause of the following topic, tsunamis.


According to the University of Washington a tsunami is "a wave train, or series of waves, generated in a body of water by an impulsive disturbance that vertically displaces the water column".
Many things can cause a tsunami to be created, some are Earthquakes, landslides, volcanic eruptions, explosions, and even the impact of cosmic bodies, such as meteorites, can generate tsunamis.
external image tsunami-formation.gif

First Picture:
P-wave Picture:
S-Wave Picture:
Love-Wave Picture:
Rayleigh-Waves Picture:
Tsunami Picture:
Information for Earthquakes: IRIS (Incorporated Research Institutions for Seismology)
Wave type Information:
Information for Tsunamis: University of Washington.