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Week One Esp101  What Is An Earthquake Clarakwan
 

Week One Esp101 What Is An Earthquake Clarakwan

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    Week One Esp101  What Is An Earthquake Clarakwan Week One Esp101 What Is An Earthquake Clarakwan Presentation Transcript

    • An earthquake is the vibration of Earth produced by the rapid release of energy 06/04/09 ESP 101 Week One
      • Focus and Epicenter
      • Focus is the point within Earth where the earthquake starts.
      • Epicenter is the location on the surface directly above the focus
      • Faults
      • Faults are fractures in Earth where movement has occurred
      06/04/09 ESP 101 Week One
    • 06/04/09 ESP 101 Week One
      • Elastic Rebound Hypothesis
      • Most earthquakes are produced by the rapid release of elastic energy stored in rock that has been subjected to great forces.
      • When the strength of the rock is exceeded, it suddenly breaks, causing the vibrations of an earthquake.
      06/04/09 ESP 101 Week One
    • 06/04/09 ESP 101 Week One
    • 06/04/09 ESP 101 Week One
    • 06/04/09 ESP 101 Week One
      • Earthquake Waves
      • Body Waves
      • Identified as P waves or S waves
      • P waves
      • Are push-pull waves that push (compress) and pull (expand) in the direction that the waves travel
      06/04/09 ESP 101 Week One
      • S waves
      • Seismic waves that travel along Earth’s outer layer
      • Shake particles at right angles to the direction that they travel
      • Travel only through solids
      • Slower velocity than P waves
      • A seismogram shows all three types of seismic waves—surface waves, P waves, and S waves.
      06/04/09 ESP 101 Week One
    • 06/04/09 ESP 101 Week One
      • Locating an Earthquake
      • Earthquake Distance
      • The epicenter is located using the difference in the arrival times between P and S wave recordings, which are related to distance.
      • Earthquake Direction
      • Travel-time graphs from three or more seismographs can be used to find the exact location of an earthquake epicenter.
      • Earthquake Zones
      • About 95 % of the major earthquakes occur in a few narrow zones.
      06/04/09 ESP 101 Week One
    • 06/04/09 ESP 101 Week One
      • Seismic wave behavior
        • P waves arrive first, then S waves, then L and R
        • Average speeds for all these waves is known
        • After an earthquake, the difference in arrival times at a seismograph station can be used to calculate the distance from the seismograph to the epicenter .
    • 06/04/09 ESP 101 Week One
    • 06/04/09 ESP 101 Week One
      • Three seismograph stations are needed to locate the epicenter of an earthquake
      • A circle where the radius equals the distance to the epicenter is drawn
      • The intersection of the circles locates the epicenter
      06/04/09 ESP 101 Week One
      • 1.bugnardo.files.wordpress.com/2008/04/08 earthquakes _and_earths_interior.ppt -
      06/04/09 ESP 101 Week One
      • The End
      06/04/09 ESP 101 Week One