GSU GEOL 1122K - CHAPTER 8 QUIZ (20 pages)

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CHAPTER 8 QUIZ



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CHAPTER 8 QUIZ

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Pages:
20
School:
Georgia State University
Course:
Geol 1122k - Introductory Geosciences Ii

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CHAPTER 8 READING QUIZ A tsunami is a special kind of tidal wave caused by the gravitational attraction of the Sun not the Moon can get big but never bigger than 30 feet high is dangerous near its source but dies out within about 200 miles may be just a broad gentle swelling out at sea but grows as it approaches shore FEEDBACK Tsunamis are caused by volcanic or seismic activity or by undersea landslides can be up to 30 meters high and can cross entire ocean basins Earthquake prediction is not highly reliable but geologists do know that earthquakes never happen outside of seismic belts that recurrence intervals can provide accurate short term predictions that swarms always precede major earthquakes and can help with short term prediction more earthquakes happen along plate boundaries than happen at intraplate locations FEEDBACK Earthquakes can occur outside of seismic belts though they are rare Accurate short term predictions are rare and are not based on recurrence intervals which refer to the average time between successive quakes on a fault Swarms may precede major earthquakes but not always and they are often identified after an earthquake not before The only choice that is correct is that more earthquakes happen along plate boundaries than at intraplate locations Examining sedimentary bedding in a geologic study reveals disrupted layers formed 260 820 1 200 2 100 and 2 300 years ago What is the recurrence interval of the earthquakes that caused the disruption 200 years 380 years 510 years 560 years FEEDBACK The recurrence interval is the average spacing between events Calculating the difference in ages between each disrupted layer and averaging those values gives a recurrence interval of 510 years 820 260 1200 820 2100 1200 2300 2100 4 560 380 900 200 4 2040 4 510 Friction is slow but steady movement along a fault is the force that resists sliding along a surface is the process by which faults release energy happens when rock is weak and can slip smoothly without creating shock waves FEEDBACK Friction caused by bumps and snags along rock surfaces is the force that resists sliding Identify the FALSE statement Normal faults result from stretching the Earth s crust thrust faults from squeezing and shortening it Any given earthquake can have more than one magnitude but can have only one intensity Moment magnitude MW rating is considered the most accurate representation of an earthquake s magnitude All earthquake magnitude scales are logarithmic which means a difference of one unit in magnitude reading represents a 10 fold difference in ground motion FEEDBACK The magnitude of an earthquake refers to the amount of energy released Therefore a given earthquake should only have one magnitude number Identify the FALSE statement Seismic waves become smaller in amplitude with increasing distance from the epicenter Earthquake magnitude is based on ground motion recorded by a seismograph intensity is based on the amount of damage produced Contour lines



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