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Earth Science Mr. Barry.  Focus : the point where an earthquake originates  Epicenter : the point on Earth’s surface directly above the focus  Fault.

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Presentation on theme: "Earth Science Mr. Barry.  Focus : the point where an earthquake originates  Epicenter : the point on Earth’s surface directly above the focus  Fault."— Presentation transcript:

1 Earth Science Mr. Barry

2  Focus : the point where an earthquake originates  Epicenter : the point on Earth’s surface directly above the focus  Fault : location along which an earthquake originates

3  Seismic Waves : vibrations of the ground during an earthquake  Primary Waves (P-waves): squeeze and pull rocks in the same direction along the direction the wave is traveling

4  Secondary Waves (S-Wave): cause rocks to move at right angles in relation to the direction of the wave  Surface Waves : move in two directions (up and down), what it actually felt on the surface

5  Seismometer : device used to measure the strength of earthquakes. A hanging device records vibrations  Seismogram : the record produced by a seismometer

6  Magnitude : the amount of energy released by an earthquake  Richter Scale : earthquake rating based on the size of the seismic waves released by the earthquake

7

8  Structures: buildings fall as ground shakes  Fires: disturbed soil destroys gas and power lines, leading to fires  Land/Soil: landslides are a common result of earthquakes

9  Tsunami : a large ocean wave generated by vertical motions of the seafloor during an earthquake

10  Earthquake prediction is based largely on probability. Factors used for these predictions are:  Earthquake history: many hot spots have earthquake recurrences  Seismic Gaps: active faults that have not experienced an earthquake recently  Strain accumulation : the build up of strain in one location


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