gly1880 topic 1

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Strike Slip Fault
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transform plate boundary
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Normal Fault
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divergent plate boundary
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Reverse (thrust) Fault
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convergent plate boundary
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Sediments are thicker on oceanic ridges than on deeper oceanic ridges
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F
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Rock in the Earth’s mantle can flow only when it melts
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F
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The earth’s mantle convects to allow heat to escape form the interior
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T
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The energy for earthquakes comes mainly from heat inside the earth
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T
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The Hawaiian Island chain is the expression of a hotspot
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T
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RISK
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risk = hazard x vulnerability x value
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S waves travel slower than P waves
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T
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Natural systems naturally trend towards more disorder (entropy)
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T
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Intraplate earthquakes can occur in the area of failed rift zones
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T
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To accelerate a frictionless cart on level ground you do work
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T
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The work is proportional to the force you apply to the cart
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T
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The work is proportional to the distance you apply the cart
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T
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The most deadly events usually happen in developing nations
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T
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1906 San Francisco earthquake happened along a subduction zone
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F
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Earthquakes usually occur away from plate boundaries
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F
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Earthquakes with shorter return times are less likely in a given year
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F
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An earthquakes magnitude should depend on its distance from the fault
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F
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Shaking in a magnitude 5 earthquake is 25% larger than a magnitude 4
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F
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The work is proportional to the amount of time you push the cart
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F
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The most costly events usually occur in developing nations
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F
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Brick structures perform well in strong shaking
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F
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Engineering affetcs the risk equation through changing the hazard
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F
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Increased normal stress makes an earthquake more likely
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F
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Intensity is more relevant to an insurer because
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it describes the effect of the quake on structure, determining the cost to the insurer
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Magnitude is more relevant to a seismologist because
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magnitude is a description of the physical size of the earthquake source at the location of the faulting
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Earthquakes occur preferentially along plate boundaries
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most oceanic crust is less than 200 million years old, which is deeper than the age of earth
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Satellite measurements like GPS show the relative motion of the plate
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Deep earthquakes show oceanic plates sinking into the mantle at subduction zones
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