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# Earthquakes Presentation

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### Earthquakes Presentation

1. 1. Warning: Any documents saved to the hard drive of this computer (the X: drive) will be automatically deleted upon logout.   Please save all documents to removable media (floppy drive is A:, CD drive is F:, USB jump drive is G:). Please save your work regularly to avoid potential data loss. The library is not liable for any data loss that results from use of this machine.
2. 3. Earthquakes <ul><li>By: Momina Afzali </li></ul>
3. 4. What are Earthquakes? <ul><li>Earthquakes are the Earth’s natural means of releasing stress </li></ul><ul><li>When the Earth’s plates move against each other, stress is put on the lithosphere </li></ul><ul><li>When this stress is great enough, the lithosphere breaks or shifts </li></ul>
4. 5. What are Earthquakes? continued <ul><li>As the plates move they put forces on themselves and each other </li></ul><ul><li>When the force is large enough, the crust is forced to break </li></ul><ul><li>When the break occurs, the stress is released as energy which we feel and call an earthquake </li></ul>
5. 6. Forces <ul><li>A force can be thought of as a push or pull </li></ul><ul><li>Force has both magnitude and direction, therefore it is a vector </li></ul><ul><li>From physics and Newton’s 2 nd law, we know that force is equal to a change in an object’s momentum which describes the quantity of motion </li></ul>
6. 8. Forces……. continued <ul><li>When a force is applied to an object, the object is said to be under stress </li></ul><ul><li>Stress is the deforming force per area </li></ul><ul><li>Stress and strain are related, so it is easy to determine one from the other if you know value of proportianality, a constant value that relates strain to stress, of the substance that is being deformed </li></ul>
7. 9. What causes stress?