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20 True/False questions

  1. The epicenter of an earthquake is the ________.surface location directly above the point where the fault slip initiates

          

  2. Energy is stored in rocks adjacent to the site of a future earthquake as ________.surface location directly above the point where the fault slip initiates

          

  3. Which one of the following is true regarding tsunamis?They occur in the open ocean, wavelengths are many miles or kilometers and wave heights are only a few feet.

          

  4. What are the smaller magnitude quakes that follow a major earthquake?focus

          

  5. Approximately how much more energy is released in a 6.5 Richter magnitude earthquake than in one with magnitude 5.5?once every hundred and fifty years

          

  6. The ________ is the point of origination for an earthquake.I to XII that rates the structural damage due to an earthquake

          

  7. The ________ is directly related to the Richter earthquake-magnitude rating.seismograph; Richter

          

  8. ________ was struck by three major earthquakes during the winter and spring months of the years 1811-1812.New Madrid, Missouri

          

  9. Which of the following foundation materials is most stable during earthquake shaking?bedrock

          

  10. ________ refers to the tendency for a foundation material to lose its internal cohesion and fail mechanically during earthquake shaking.Liquefaction

          

  11. ________ is a widely accepted explanation for the mechanism that generates earthquakes.Reid's elastic rebound theory

          

  12. Why was the Marina District, San Francisco, heavily damaged in the 1906 and 1989 quakes?Liquefaction and foundation failures were common.

          

  13. Approximately how often do locked segments of the San Andreas Fault (California) break, resulting in major earthquakes?30 times

          

  14. The ________ magnitude scale is a measure of the energy released. It does not directly measure the extent of building damage.amplitude of the seismic waves

          

  15. Which one of the following statements concerning foci and epicenters is correct?They occur in the open ocean, wavelengths are many miles or kilometers and wave heights are only a few feet.

          

  16. The Mercalli Scale is a scale from ________.I to XII that rates the structural damage due to an earthquake

          

  17. The largest lateral, ground displacement is produced by ________.horizontally vibrating surface waves

          

  18. The elastic rebound theory for the origin of earthquakes was first proposed by ________ following the ________ earthquake.surface location directly above the point where the fault slip initiates

          

  19. P waves ________.are faster than S waves and surface waves

          

  20. The ________ is used to record ground shaking and the earthquake-magnitude scale was invented by ________.amplitude of the seismic waves