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What is an earthquake.doc

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What is an earthquake? Earthquakes are the shaking, rolling or sudden shock of the earth’s surface. They are the Earth's natural means of releasing stress. More than a million earthquakes rattle the world each year. The West Coast is most at risk of having an earthquake, ut earthquakes can ha!!en in the Midwest and along the East Coast. Earthquakes can e felt over large areas although they usually last less than one minute. Earthquakes cannot e !redicted although scientists are working o
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  What is an earthquake? Earthquakes are the shaking, rolling or sudden shock of the earth’s surface. They are the Earth's natural means of releasing stress. More than a million earthquakes rattle the world each year. The West Coast is most at risk of having an earthquake, ut earthquakes can ha!!en in the Midwest and along the East Coast. Earthquakes can e felt over large areas although they usually last less than one minute. Earthquakes cannot e !redicted although scientists are working on it# Click Here  to learn more aout earthquakes from $%&%.ecause !eo!le are frequently left relying on themselves for awhile after an earthquake, it is a good idea to have an earthquake survival kit ready. Everyone wholives in an area where large earthquakes can ha!!en should have one of these kits in their home. What causes an earthquake? There are aout () !lates along the surface of the earth that move continuously and slowly !ast each other. When the !lates squee*e or stretch, huge rocks form at their edges and the rocks shift with great force, causing an earthquake. Think of it this way+ magine holding a !encil hori*ontally. f you were to a!!ly a force to oth ends of the !encil y !ushing down on them, you would see the !encil end. -fter enough force was a!!lied, the !encil would reak in the middle, releasing thestress you have !ut on it. The Earth's crust acts in the same way. -s the !lates move they !ut forces on themselves and each other. When the force is large enough, the crust is forced to reak. When the reak occurs, the stress is released as energy which moves through the Earth in the form of waves, which we feel and call an earthquake. &ra!hic Credit+ Wheeling /esuit $niversity01-%- Classroom of the 2uture3  Click Here  to see an animation of an earthquake. t's great for kids, ecause they get to see how it actually ha!!ens# What is a fault? - fault is an area of stress in the earth where roken rocks slide !ast each other, causing a crack in the Earth's surface. There are the ma4or ty!es of faults+ di! sli! normal, di! sli! reverse, strike sli!, and olique sli!. What are plate tectonics? The theory of !late tectonics is a interesting story of continents drifting from !lace to !lace reaking a!art, colliding, and grinding against each other. The !late tectonic theory is su!!orted y a wide range of evidence that considers the earth's crust and u!!er mantle to e com!osed of several large, thin, relatively rigid !lates that move relative to one another. %ee !late tectonic gra!hic aove.3 The !lates are all moving in different directions and at different s!eeds. %ometimes the !lates crash together, !ull a!art or sideswi!e each other. When this ha!!ens, it commonly results in earthquakes.  Continental 5rift+ To see this animation again, just refresh this page!  This animation shows you what our !lanet looked like millions of years ago and what it looks like now# &ra!hic Credit+ &eology 5e!artment at $niversity of California, erkeley3 Click Here  to learn more aout !late tectonics and the drifting of our continents. What is a seismograph? - seismogra!h is an instrument used for recording the intensity and duration of an earthquake. Click Here  to calculate the strength of earthquakes# What is a tsunami? - tsunami is a large ocean wave usually caused y an underwater earthquake or a volcanic e6!losion. Tsunamis are 17T tidal waves. Tidal waves are caused y the forces of the moon, sun, and !lanets u!on the tides, as well as the wind as it moves over the water. With ty!ical waves, water flows in circles, ut with a tsunami, water flows straight. This is why tsunamis cause so much damage#  Click Here  to see an animation of an earthquake and the resulting tsunami. t's great for kids, ecause they get to see how it actually ha!!ens# Click Here  to get the latest tsunami warning information from the 1W%. Click Here  for tsunami safety information. Know the Lingo ECE TE#   The !oint on the earth's surface directly aove the source of the earthquake. $E$%C W&'E$   The energy created y the quake travels in waves from the e!icenter, where they are the strongest. The waves shake uildings, structures and the earth vertically, causing them to move hori*ontally#
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