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Active Message Threads for December 2006
ChrisAtUpw@aol.com
In a message dated 31/12/2006, jerdell@cox.net writes:
Greetings,
I am trying to understand the band pass filters and have a few questions.
1. John Lahr stated that;
“Since the AS-1 samples the amplitude of the seismic signal about 6 times
per second, clearly high frequencies will not be well represented. The highest
frequency that it's theoretically possible to record faithfully is one half
of the sample rate.”
You interpret this as six/2 = max frequency = 3Hz You tend not t…
[more]
No replies
jerdell@cox.net
Greetings,
I am trying to understand the band pass filters and have a few questions.
1. John Lahr stated that;
"Since the AS-1 samples the amplitude of the seismic signal about 6 times
per second, clearly high frequencies will not be well represented. The
highest frequency that it's theoretically possible to record faithfully is
one half of the sample rate."
So if a sample is taken every .17 seconds (6 times per second) and you
divide that in half you get .33seconds. Therefore seismic…
[more]
Replies
-
Re: (no subject) - Bob Hutt - 2006-12-31 18:57:23
Greetings and Happy New Year,
I just wanted to share with everyone a problem I had with my AS-1 and the
solution. I left for China on Aug 10th and as soon as I got to Chengdu and
checked the school seismograph;
http://www.pcds.org/share/earthquake/
it had stopped working. The seismograph was not recording anything; it was
if the seismometer was no longer connected to the CPU. The next day I
checked back and it was recording but the trace was wandering across the
screen like a chicken in a…
[more]
No replies
Alan Jones
Neat story on sounds of the entire earth speeded up so you can hear them. Check out:
http://www.npr.org/templates/story/story.php?storyId=6615446
Alan
No replies
John or Jan Lahr
Below is an excerpt from December newsletter of
the Windows to the Universe program.
http://www.windows.ucar.edu/
Second Anniversary of South-East Asian Tsunami
by <http://www.windows.ucar.edu/tour/link=/bio/Roberta.html>Roberta
December 26th brings the second anniversary of
the
<http://www.windows.ucar.edu/tour/link=/headline_universe/earth_science/stories_2004/tsunami_news.html>massive
tsunami in 2004 which brought destruction and
death to many countries bordering the Indian
Ocean i…
[more]
