Please help me with my natural disters project!!?

Question

Hey pplez, anywaiz um i need help with my project..........well you see i have to do a project on a particular natural disaster and i chose earthquakes. So please help me out and provide me with info on earthquakes or give me info sites. thnks

How does a earthquake happen?

What is an Earthquake?

&& Interesting information........[=

Answer 1

Hey, I did the same project, except I had to do a bunch of other natural disasters as well. I found this as my best source of information : http://en.wikipedia.org/wiki/Earthquakes

Answer 2

Nice project.

This site will have all you informations.

http://earthquake.usgs.gov/learning/topi...

have fun.

Answer 3

Earthquake

for  trivia - http://www.google.com/search?sourceid=na...

Answer 4

You will find everything you need here. =)

http://www.usgs.gov/science/science.php?...

Answer 5

What are earthquakes?

Earthquakes are the Earth's natural means of releasing stress. When the Earth's plates move against each other, stress is put on the lithosphere. When this stress is great enough, the lithosphere breaks or shifts. Imagine holding a pencil horizontally. If you were to apply a force to both ends of the pencil by pushing down on them, you would see the pencil bend. After enough force was applied, the pencil would break in the middle, releasing the stress you have put on it. The Earth's crust acts in the same way. As the plates move they put forces on themselves and each other. When the force is large enough, the crust is forced to break. When the break occurs, the stress is released as energy which moves through the Earth in the form of waves, which we feel and call an earthquake.

Types of earthquakes

There are many different types of earthquakes: tectonic, volcanic, and explosion. The type of earthquake depends on the region where it occurs and the geological make-up of that region. The most common are tectonic earthquakes. These occur when rocks in the earth's crust break due to geological forces created by movement of tectonic plates. Another type,volcanic earthquakes, occur in conjunction with volcanic activity. Collapse earthquakes are small earthquakes in underground caverns and mines, and explosion earthquakes result from the explosion of nuclear and chemical devices. We can measure motion from large tectonic earthquakes using GPS because rocks on either side of a fault are offset during this type of earthquake.

What causes stress?

So far we understand that there are different types of earthquakes, caused by forces under the Earth's crust that change the shape of the material they are acting on, and produce a variety of waves which we feel. But what are these forces? Where do they occur? What causes them?

The explanation for the majority of earthquakes in recent years falls under the category of plate tectonics. When two plates interact at their boundaries they put forces on each other. These forces of reaction cause physical and chemical changes at their boundaries. Plates move side to side, up and down, and also interact head on. Earthquakes also occur in these areas where new plates are being created and old plates are being subducted into the Earth's interior. Earthquakes which are due to the interaction of plates are called interplate earthquakes. But what about intraplate earthquakes, which occur across one plate? Less common than earthquakes that occur at plate boundaries, these earthquakes are due to local systems of forces, such as lack of strength or changes in temperature below the Earth's crust. Most often they are due to movement on pre-existing faults.



How Many Earthquakes Does It Take To Build A Mountain? ..

IF you want this interesting information.. go visit http://scign.jpl.nasa.gov/learn/eqact1.h...