Here's a fun earthquake quiz from Florida International University:

http://www.fiu.edu/~srimal/erthqkqz.htm

Click the correct radial button, & your score will be generated at the
end of the quiz.

I missed two: No. 7 (a simple fact I just didn't know) & No. 8, the
answer to which confuses me because I assumed that, the further you
get from the quake origin, the greater the distance between P & S
waves grows (because P waves travel faster).







____
Let there be therefore two streams & two dispensations
of knowledge; & in like manner two tribes or kindreds of
students in philosophy -- tribes not hostile or alien to
each other, but bound together by mutual services; -- let
there in short be one method for the cultivation, another
for the invention, of knowledge.

-- Bacon, Preface, Novum Organum

Here's a fun earthquake quiz from Florida International University:

http://www.fiu.edu/~srimal/erthqkqz.htm

Click the correct radial button, & your score will be generated at the
end of the quiz.

I missed two: No. 7 (a simple fact I just didn't know)

& No. 8, the
answer to which confuses me because I assumed that, the further you
get from the quake origin, the greater the distance between P & S
waves grows (because P waves travel faster).

I missed two: No. 7 (a simple fact I just didn't know)

This follows from simple triangulation principles when all you really
know is the distance to an event. With 1 station, all you can tell is
that the event is a given distance away. This gives you a circle. With
2 stations, you get the intersection of two circles, which will most of
the time give you 2 potential locations (very rarely, just one if the
circles are tangent to each other). With 3 stations, you can narrow it
down to a single location.

On Fri, 29 Feb 2008 12:15:58 -0800, David Oberman <doberman@etc.
wrote:

Here's a fun earthquake quiz from Florida International University:

http://www.fiu.edu/~srimal/erthqkqz.htm

Click the correct radial button, & your score will be generated at the
end of the quiz.

I missed two: No. 7 (a simple fact I just didn't know) & No. 8, the
answer to which confuses me because I assumed that, the further you
get from the quake origin, the greater the distance between P & S
waves grows (because P waves travel faster).







____
Let there be therefore two streams & two dispensations
of knowledge; & in like manner two tribes or kindreds of
students in philosophy -- tribes not hostile or alien to
each other, but bound together by mutual services; -- let
there in short be one method for the cultivation, another
for the invention, of knowledge.

-- Bacon, Preface, Novum Organum


I didn't like the answer for nr 1.

tar@sevak.isi.edu (Thomas A. Russ) wrote:

I missed two: No. 7 (a simple fact I just didn't know)

This follows from simple triangulation principles when all you really
know is the distance to an event. With 1 station, all you can tell is
that the event is a given distance away. This gives you a circle. With
2 stations, you get the intersection of two circles, which will most of
the time give you 2 potential locations (very rarely, just one if the
circles are tangent to each other). With 3 stations, you can narrow it
down to a single location.

Thanks for the explanation, Thomas.
Incidentally, I just found a bigger version of the quiz at:
www.uh.edu/~jbutler/physical/chap18mult.html
47 questions in all, each one a "shear" unadulterated joy!

Plus I don't agree with 26 - the up/down first motion depends on where you
are with respect to the fault zone - you can just tell by looking at the
trace.

"Landy" <noone@nowhere.net> wrote:

Plus I don't agree with 26 - the up/down first motion depends on where you
are with respect to the fault zone - you can just tell by looking at the
trace.

So you're saying that, based on the diagram, it could be a reverse
fault?

& No. 8, the
answer to which confuses me because I assumed that, the further you
get from the quake origin, the greater the distance between P & S
waves grows (because P waves travel faster).

I agree with you on number 8. I thought there were two correct answers
in the list. But I lucked out and picked the correct one.

On 29 Feb 2008 12:58:53 -0800, tar@sevak.isi.edu (Thomas A. Russ) wrote:


& No. 8, the
answer to which confuses me because I assumed that, the further you
get from the quake origin, the greater the distance between P & S
waves grows (because P waves travel faster).

I agree with you on number 8. I thought there were two correct answers
in the list. But I lucked out and picked the correct one.

I missed that too (and ONLY that), and consider it, at best, a 'trick'
question.
....

Remove XYZ to email me

This from one of my Geology textbooks: "As the distance away from the
earthqake's focus increases, the S wave lags farther and farther behind the
P wave."

Here's a fun earthquake quiz from Florida International University:

http://www.fiu.edu/~srimal/erthqkqz.htm

Click the correct radial button, & your score will be generated at the
end of the quiz.

I missed two: No. 7 (a simple fact I just didn't know) & No. 8, the
answer to which confuses me because I assumed that, the further you
get from the quake origin, the greater the distance between P & S
waves grows (because P waves travel faster).

"John" <john.vid...@gmail.com> wrote in message

news:46e242b2-49a6-41b4-9d20-1e09ce2f9066@s8g2000prg.googlegroups.com...

On the 47-question test, some more criticism:
31. Although the teacher probably told its readers only S-P times can
find the distance, surface wave - P times can be used as well.
Conceptually, it would work the same way.

But you don't know the P "time" - you know the arrival time, but you don't
know the travel time, which is where S-P comes in.
cheers
Bill