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20 Cards in this Set
- Front
- Back
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The energy that drives plate tectonics is
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internal heat energy
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The difference in time between the arrival of the P-wave and S-wave always tells you....
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the distance to the focus of the quake
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Approximately how large would an earthquake be if the strong shaking lasts for 1 minute?
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8
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Large magnitude 9 earthquakes occur exclusively along what type of plate boundary?
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subduction zones
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A magnitude 6 earthquake releases_________ as much energy as a magnitude 4?
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1000 times
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Which of the following is not used to determine the RICHTER magnitude?
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duration of S-wave shaking
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Which of the following statements is true about seismic waves
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S-waves travel slower than P-waves.
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The Modified Mercalli scale would be least helpful in determining the...
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moment magnitude of an earthquake
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If a seismic waves move from bedrock into softer layers of a sedimentary basin like Los Angeles, the waves will...
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slow down, increase in amplitude, decrease the duration of
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The magnitude of an earthquake can be quickly estimated because...
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the duration of shaking correlates with the magnitude
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Which of the following quakes would likely kill the most people?
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7.2M, 25 km depth, Istanbul, Turkey (very high pop, poor construction)
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Reverse faults or thrust faults would be associated with which of the following....
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continental collision zones
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What geologic activity would be associated with a right bend in a right lateral fault?
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basin formation with normal faults
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Which of the following is used to calculate the MOMENT magnitude of an earthquake?
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the length and depth of the fault rupture
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The big bend of the San Andreas Fault produces these “hidden” types of faults in the Los Angeles basin?
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reverse faults
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Baja and San Diego are moving northwest at 5cm /year along the San Andreas Fault. How many million years will it take Baja to reach Alaska a distance of 4000 km
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80
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San Diego is located on the
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the Pacific Plate
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Which type of building is the least earthquake resistant?
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MASONRY
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A seismograph records an earthquake. Thirty three seconds after the P-wave arrives, S-waves shaking begins and lasts for twenty seconds. If the seismogram records an S-wave amplitude of 100mm what is the indicated Richter magnitude?
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6
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How far from the quake is the seismograph located?
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300km
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