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ir query

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Manager
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Joined: 31 Jul 2010
Posts: 109
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ir query [#permalink] New post 03 Feb 2013, 09:16
Earthquakes occur when energy in the earth’s crust is suddenly released, forcing tectonic plates to shift. Earthquakes are classified as foreshocks, main shocks, or aftershocks. What differentiates one category from another is their relation to each other in space and time. A foreshock is only a foreshock if it occurs before a bigger quake on the same fault system. Similarly, an aftershock occurs only after a bigger quake on the same fault system. Interestingly, the probability that an earthquake will trigger a bigger earthquake does not depend on the magnitude of the first earthquake, but rather is related to the location of that first quake and its interaction with the fault system.

choose 1 statement from each column.

True False Statement
All main shocks are preceded by foreshocks.
All main shocks are followed by aftershocks.
Aftershocks are more common that foreshocks.
Foreshocks are generally weaker than aftershocks.
Main shocks can be triggered by foreshocks.
An aftershock can be a bigger earthquake than the main shock that preceded it.


i will give official answers after some discussion ,which one do you think are the 2 correct statements,this is 1 confusing question.


Thanks and regards,
Sidd
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Joined: 24 Aug 2009
Posts: 509
Schools: Harvard, Columbia, Stern, Booth, LSB,
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Re: ir query [#permalink] New post 03 Feb 2013, 09:34
siddharth86 wrote:
Earthquakes occur when energy in the earth’s crust is suddenly released, forcing tectonic plates to shift. Earthquakes are classified as foreshocks, main shocks, or aftershocks. What differentiates one category from another is their relation to each other in space and time. A foreshock is only a foreshock if it occurs before a bigger quake on the same fault system. Similarly, an aftershock occurs only after a bigger quake on the same fault system. Interestingly, the probability that an earthquake will trigger a bigger earthquake does not depend on the magnitude of the first earthquake, but rather is related to the location of that first quake and its interaction with the fault system.

choose 1 statement from each column.

True False Statement
All main shocks are preceded by foreshocks.
All main shocks are followed by aftershocks.
Aftershocks are more common that foreshocks.
Foreshocks are generally weaker than aftershocks.
Main shocks can be triggered by foreshocks.
An aftershock can be a bigger earthquake than the main shock that preceded it.

i will give official answers after some discussion ,which one do you think are the 2 correct statements,this is 1 confusing question.

Thanks and regards,
Sidd


Hi Siddharth,

Try to post complete question (with all the terms) as it help everyone to understand the question completely. I couldn't get the question completely, but still my answers are as follows-
A) Yes
B) No
C) No
D) No
E) No
F) No
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Re: ir query   [#permalink] 03 Feb 2013, 09:34
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