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Earthquakes:. How to find where they originate…. Terminology:. Epicenter vs. Focus Focus is the point beneath Earth\'s surface where rock breaks under stress (or plates shift) and causes an earthquake . Epicenter is the point on land, directly above the focus. Graph vs Gram.

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earthquakes

Earthquakes:

How to find where they originate…

terminology
Terminology:
  • Epicenter vs. Focus
  • Focus is the point beneath Earth\'s surface where rock breaks under stress (or plates shift) and causes an earthquake.
  • Epicenter is the point on land, directly above the focus
graph vs gram
Graph vs Gram
  • Seismograph are instruments that measure and record motions of the ground, including seismic waves generated by earthquakes, nuclear explosions, and other seismic sources
  • Seismogram is a graph output by a seismograph. It is a record of the ground motion at a measuring station as a function of time.
  • How Seismograph Works
s waves vs p waves
S waves vs P waves
  • P waves
    • Primary Waves
    • Named that because they leave the focus first
    • Travel faster than S waves
    • Compression Waves
  • S waves
    • Secondary Waves
    • Named that because they leave the focus second
    • Travel slower than P waves
    • Transverse Waves
  • S wave P wave Animation
  • (slinky)
how do we locate earthquakes
How do we locate earthquakes?
  • Seismograph data (seismograms) will tell us distance from an earthquake epicenter
  • We need 3 seismograph readings to find an epicenter
how do we determine distance
How do we determine distance?
  • Lag time between P wave and S wave tells us distance
  • Fast Runners and Slow Runners...
try the activity
Try the activity:
  • http://www.sciencecourseware.com/VirtualEarthquake/VQuakeExecute.html
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