Quiz 3 3_4_10 answer key-1 - EAS/ENGR122Earthquake!...

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EAS/ENGR 122 Earthquake! Spring 2010 Quiz 3   3_4_10  ANSWER KEY 1.  Virtually all of the great (Mw > 8.8) earthquakes occur at convergent plate margins  because:  a) vertical tectonic stress is larger b) island arc magmatism weakens the crust in the subduction zone c) water carried down by subduction lubricates the fault, thus making earthquakes more  likely d) the low dip of thrust faults places more fault area in the brittle deformation   zone 2. Tsunami literally translates from Japanese to English as: a)   “tidal wave” b)       “harbor wave”       c) “the divine wind” d) “look out, SS Poseidon” 3.  Distance from a seismic station to an earthquake is usually estimated from: a) the travel time of the P wave to the station  b) the amplitude of the surface waves measured at the station c) the direction of first motion of the P wave on the horizontal seismographs
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Quiz 3 3_4_10 answer key-1 - EAS/ENGR122Earthquake!...

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