1. How do we find the origin of an Earthquake
How do we find the origin of an Earthquake? How do we measure the strength of an earthquake?

2. VIRTUAL EARTHQUAKE

3. Website: http://www.sciencecourseware.com/virtualearthquake/

5. Earthquakes – movement of earth’s crust caused by tectonic plates shifting and releasing stored energy Focus – The origin of the earthquake where rocks first break and move Seismograph – instrument used to detect and record seismic waves

6. P(primary) waves are ______________ than S(secondary) waves
Seismic Waves
P(primary) waves are ______________ than S(secondary) waves
FASTER

7. Which region of the world did you choose?

8. Enter your S-P Intervals
Seismic Station S-P Interval = seconds
Record City and Interval

9. 55
540

10. HOW CLOSE?

11. What was the epicenter of your earthquake?

12. Measuring Amplitude
190

13. The Richter Nomogram

14. Enter Your Amplitudes
Maximum S Wave Amplitude=

15. Estimate Magnitude

16. CONGRATULATIONS. You've done a great job
CONGRATULATIONS! You've done a great job. Remember to write down the actual magnitude of your earthquake.

17. EXPLANATION
What is the difference between the epicenter and the focus of an earthquake?

18. What causes the seismic waves that create Earthquakes?

19. This happens on a FAULT LINE when the plates:
separate from one another
(Normal Fault)
squish closer together or compress (Reverse Fault)
slide alongside one another
(Strike-Slip Fault)

20. What are the three types of seismic waves?
1) P waves – primary waves
faster, longitudinal (push & pull)
2) S waves – secondary waves
slower, transverse waves (side to side)
3) L waves – love waves
when P or S waves hit the surface
slowest and most destructive

21. What scale is commonly used to measure the magnitude of earthquakes?
The Richter Scale
The Richter scale is a base ten scale. Can anyone explain what that means?
A base ten scale means that each integer represents a 10x increase in magnitude from the previous integer.

22. EVEN MORE!

23. ELABORATION
ARE EARTHQUAKES THE ONLY TYPE OF NATURAL DISASTER CAUSED BY THE MOVEMENT OF THE EARTH’S TECTONIC PLATES?”