# gly1880 topic 1

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