EOSC 114 Earthquakes Exam Questions and Answers All Correct
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Module
EOSC 114 Earthquakes
Institution
EOSC 114 Earthquakes
EOSC 114 Earthquakes Exam Questions and Answers All Correct
What information do you need to calculate Richter magnitude? - Answer- time between P and S wave arrivals and maximum amplitude of shaking
The movement of the pacific plate past the North American plate along the Queen Charlotte fault...
EOSC 114 Earthquakes Exam Questions
and Answers All Correct
What information do you need to calculate Richter magnitude? - Answer- time between
P and S wave arrivals and maximum amplitude of shaking
The movement of the pacific plate past the North American plate along the Queen
Charlotte fault is an example of what type of plate boundary? - Answer- transform
Which statement about the February 28, 2001 Nisqually earthquake is TRUE? -
Answer- it occurred in the subduction zone where the Juan de Fuca plate is diving
under the North America plate
Love waves are - Answer- surface waves producing horizontal (side-to-side) ground
displacements
Which of the following statements concerning earthquake intensity is FALSE? - Answer-
to determine intensity the type of seismometer recording the waves must be known
The Himalayas are an example of a ____ plate boundary - Answer- continental collision
Subduction occurs at which type of plate boundary? - Answer- ocean-ocean convergent
In order to estimate an earthquake's location using seismograms, what do you need to
know along with the P-wave and S-wave arrival times? - Answer- the velocities of the P-
wave and S- wave
one reason that soft rocks are more hazardous for structure than hard rocks is -
Answer- seismic waves generally have larger amplitude in soft rocks
what kind of deformation is most frequently and easily visible in rocks? - Answer- plastic
when we refer to "plates" we are talking about the - Answer- cold, low density
lithosphere
compared to small earthquakes, seismic waves from large earthquakes - Answer-
contain lower frequencies
you recently bought a duplex in Vancouver, in which the basement level had been
turned into parking spaces. To make the building safer in a earthquake, you should
NOT - Answer- remove the large rubber foundation blocks
, what type of force does the Earth's crust experience along a strike-slip plate boundary?
- Answer- shaear
how do we know there there are moderate-sized "silent" earthquakes along the
Cascadia subduction zone every 400 days or so? - Answer- these earthquakes occur
too slowly to generate typical seismic waves but motion can be detected with GPS
the strongest earthquake ever recorded with modern instruments was approximately of
magnitude - Answer- 9.5
most large-magnitude earthquakes occur - Answer- where plates converge
which of the following correctly describe how faults rupture? - Answer- the greatest
amount of slip can occur some distance from the hypocentre
intraplate earthquakes - Answer- occur within the interior of continents
when a fault ruptures deep in the lithosphere, the energy is released mainly by -
Answer- both P-waves and S-waves that dissipate in all directions away from the fault
plane
one important distinction between earthquake magnitude and felt intensity is - Answer-
felt intensity is subjective whereas magnitude is measured
the exact time of the last megaquake in the Pacific Northwest was determined by -
Answer- Japanese tsunami recors
a building's resonant frequency is related to - Answer- its height
which types of faults pose the LEASt risk to residents of southwest BC? - Answer-
normal faults in the continental upper crust
which of the following factors does NOT influence the Modified Mercalli intensity of an
earthquake> - Answer- the distribution of seismic stations
earthquakes are expected in Cascadia because - Answer- the Juan de Fuca plate is
subducting under the North American Plate
how does a map of stress change help "predict" earthquakes - Answer- it indicates
regions where the probability of an earthquake has increased
____ are primary effects of earthquakes while ____ are secondary effects - Answer-
ground shaking and surface rupture...land-level change and liquefication
first wave recorded on a seismogram - Answer- p-wave
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