esci
Terms
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1. When an earthquake occurs, energy radiates in all directions from its source. The source is also referred to as the
a. inertial point
b. focus
c. epicenter
d. seismic zone
e. wave front - b. focus
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2. Travel-time graphs are used to determine the distances between monitoring stations and art earthquake epicenter.
a. True
b. False - true
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3. When examining a typical seismic record, we expect to find surface waves (L) arriving before the body (P/S) waves.
a. True
b. False
- false
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4. The instrument, which records earthquake events, is called a (n) ____________
a. polygraph
b. seismogram
c. seismograph
d. barograph
e. epigraph - seismograph
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5. Most of our knowledge about Earth’s interior comes from _____________
a. drill holes
b. volcanic eruptions
c. seismic waves
d. exposed batholiths
e. examination of deep mine shafts
- seismic waves
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6. The thinnest layer of Earth is the
a. crust
b. inner core
c. outer core
d. lower mantle
e. upper mantle
- crust
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7. The greatest frequency of earthquake activity occurs in a relatively narrow belt surrounding the Atlantic Ocean called the “circle of fire.â€
a. True
b. False - false
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8. The mineral gold (Au) is considered a native mineral.
a. True
b. False
- true
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9. The written record of an earthquake obtained from seismic instruments is called a (n)
a. seismograph
b. seismogram
c. time4ravel graph
d. distance-time graph
e. epigraph
- seismogram
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10. Primary waves are transmitted _________
a. faster than secondary waves
b. only through solids
c. through solids and liquids
d. faster than secondary waves and only through solids
e. faster than secondary waves and through solids, liquid - faster than secondary waves and through solids, liquids, and gases.
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11. Considering its distance from the source of the September 19, 1985 earthquake, Mexico City was damaged more than might be expected because _____________
a. of very poor building design
b. the buildings were very close together
c. the city was - the city was built on unconsolidated sediments of an old riverbed
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12. The 0 soil horizon exhibits quantities of organic material and biological activity.
a. True
b. False
- True
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13. Sinne San Francisco has already experienced a very destructive earthquake (1906), it is not likely to experience another.
a. True
b. False
- False
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14. Seismographs can detect earthquakes no more than 500 miles of the instrument.
a. True
b. False
- False
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15. Surface (L) waves are generally the largest seismic wave in regards to amplitude.
a. True
b. False
- True
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16. S waves ___________
a. are also known as surface waves
b. travel through solids, liquids, and gases
c. are slower than P-waves
d. are the only waves recorded on seismographs
e. are slower than surface waves - are slower than P-waves
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17. The mineral sulfur has a bright yellow color and a “rotten egg†smell.
a. True
b. False
- true
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18. The amount of destruction caused by earthquake vibrations is affected by
a. the design of structures
b. the intensity and duration of the vibrations
c. the nature of the surface material
d. all of these
e. only the intensity and dur - all of these
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19. Overall, this type of seismic wave is considered the most destructive.
a. P waves
b. S waves
c. surface waves
d. tsunami
e. seiches
- surface waves
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20. The position on Earth’s surface directly above the earthquake source is called the
a. epicenter
b. inertial point
c. focus
d. seismic site
e. wave front - epicenter
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11. Considering its distance from the source of the September 19, 1985 earthquake, _Mexico City was damaged more than might be expected because ___
c. the city was built on granite, which readily transmitted the vibrations.
d. the city was built on - the city was built on unconsolidated sediments of an old riverbed