Video Review Question Set Earth Revealed - Earthquakes
Watch the video and answer the following review questions.
ANSWER KEY
1. What is the direct cause of most major large earthquakes?
The frictions of the slowly moving lithosphere, making it jerk and create earthquakes.
2. Why do we need rivers and mountain ranges?
We need them because then there would only be flat planes and rivers would lose principal source of
water.
3. What are the names of the two tectonic plates that are to be the San Andreas Fault?
North American plate and the Pacific plates.
4. What was the measure on the Richter scale of the large earth quake in California?
8.2.
5. Define what a fault is:
a fault is a zone of weakness in earth’s crust.
6. True or False: An earthquake can occur along a fault that has already had an occurred earthquake.
True.
7. How many stations does it take to locate the epicenter of the earthquake?
3.
8. True or False: The “pendulum” that the Chinese used was more accurate than the seismograph.
False.
9. What does the magnitude number eight or above compare to?
200 1-mega ton nuclear bombs.
10. In where did it take place that there was the highest earthquake ever recorded?
Alaska.
11. What is it called when two wave crests to pass a stationary point?
Wave period.
12. How long do those periods last?
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Several seconds.
13. How many times does the San Andreas quake fault move?
Once every 21-22 years.
14. What is the vibroseis project? What does it accomplish?
It is an analysis in which a specially quipped truck that shakes the ground, triggering waves of seismic
energy.
15. What does this experiment measure?
The velocity of rock layers and refracted scatter waves and where it has a shift of change.
16. What does a creep meter measure?
The fault slip at the surface.
17. True or False: The creep meter discontinues during a large earthquakes.
False.
18. What does a geometer do? How is it used?
It is a laser light that shoots 18 reflectors in order to measure and keep track the light takes to leave and
return with time with measurement of fractions.
19. True or False: A creep meter can detect any kind of motion except/aside from the surface.
False.
20. True or False: Ground water will respond by either rising or falling due to motion.
True.
21. What does it mean if the water drops in water level?
The ground swelling or cracking from the days preceding earthquake.
22. How do you measure a foreshock?
with a Seismometer and seismograms.
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