Published on

  • Be the first to comment

  • Be the first to like this

No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide


  1. 1. All About Earthquakes. Mena Ames & Kaylee Ayers. Mrs. Smith. 3rd Hour. April 8, 2011.
  2. 2. Basic Background Information <ul><li>What is an earthquake? </li></ul><ul><li>A series of vibrations in the earth’s crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating. </li></ul><ul><li>How are earthquakes measured? </li></ul><ul><li>Earthquakes are measured by a Richter scale. </li></ul><ul><li>What does magnitude mean? </li></ul><ul><li>The measurement of earthquakes strength based on seismic waves and movement along faults. Or the magnitude. </li></ul><ul><li>How is magnitude measured? </li></ul><ul><li>Magnitude is measured with the Mercalli scale or the Richter scale. </li></ul>
  3. 3. Damage Caused by Earthquakes <ul><li> Tsunami occurred. </li></ul><ul><li> Nuclear Power Plant blew up. </li></ul><ul><li> Thousands of homes destroyed. </li></ul><ul><li> Families lost. </li></ul>
  4. 4. Waves <ul><li>What are earthquake waves called? </li></ul><ul><li>Seismic waves. </li></ul><ul><li>What two types of seismic waves are there? </li></ul><ul><li>Primary waves and Secondary waves, or P waves and S waves. </li></ul><ul><li>What two types of body waves are there? </li></ul><ul><li>Primary and Secondary waves. </li></ul>
  5. 5. Body Waves <ul><li>How do P waves travel? </li></ul><ul><li>P waves travel through solids and liquids, while they compress and expand. </li></ul><ul><li>How do S waves travel? </li></ul><ul><li>S waves only travel through solids, while moving side to side. </li></ul><ul><li>Which move faster? </li></ul><ul><li>P waves move faster because they are the first to arrive. </li></ul>
  6. 6. Elastic Rebound <ul><li>Mechanism used by geologists to explain earthquakes and surface ruptures seen when a deep fault movement breaks through to Earth’s surface. </li></ul>
  7. 7. The Tohoku Earthquake <ul><li>This quake occurred at : </li></ul><ul><li>2:46 p.m. on Friday. </li></ul><ul><li>This quake occurred </li></ul><ul><li>Near the east coast of Honshu, Japan. </li></ul><ul><li>The magnitude of this quake was </li></ul><ul><li>9.0 </li></ul>
  8. 8. Effects on the environment/earth <ul><li> Japan’s coastline may have shifted by as much as 4m (13ft) to the east. </li></ul><ul><li> The quake probably shifted Earth on it’s axis by 6.5 inches. </li></ul><ul><li> Caused the planet to rotate somehow faster shortening the length of the day by 1.8 millionths of a second. </li></ul>.
  9. 9. Effects on the People of Japan <ul><li>Many lost family members and loved ones. </li></ul><ul><li>Destroyed homes. </li></ul><ul><li>Lost cars. </li></ul><ul><li>Contaminated food resources. </li></ul>
  10. 10. Effects on the Economy of Japan <ul><li>They can no longer export as many goods. </li></ul><ul><li>Costs a lot of money to rebuild what was destroyed. </li></ul><ul><li>Can no longer receive goods. </li></ul>
  11. 11. GPS Sensors <ul><li>One interesting fact about this earthquake is that it moved several GPS sensors. This will require massive movement of the earth’s crust. </li></ul><ul><li>How does elastic rebound explain this movement? </li></ul><ul><li>Elastic strain on the tectonic plates builds up along their edges in the rocks along fault planes. </li></ul>
  12. 12. Tsunamis <ul><li>What is a tsunami? </li></ul><ul><li>A giant wave caused by an earthquake on the ocean floor . </li></ul><ul><li>How do tsunami waves appear at sea? </li></ul><ul><li>How high can tsunami waves be? </li></ul><ul><li>A tsunami wave can get as high as 40 feet . </li></ul><ul><li>How fast can tsunami waves move? </li></ul><ul><li>A tsunami wave can move as fast as 500 miles per hour. </li></ul>
  13. 13. Websites Used <ul><li> </li></ul><ul><li> </li></ul>