At 01:35 PM 2009-10-13, Dan Dugan wrote:
>John Neville said he'd heard the humming, and the quote of the Nature
>abstract says
>
> > free oscillation peaks have been consistently identified in seismic
> > records in the frequency range 2-7 mHz
>
>Either there's a typo or John needs a rather high sample rate to
>record that hum...
Hi, Dan,
The way I read this is 500 seconds/cycle to 143 seconds per cycle.
The lower-case "m" refers to milli or 1/1000 of a Hz or 1000 seconds per cycle.
Does that make sense in context? Is this why it took seven years of analysis?
Upper-case "M" refers to mega or 1,000,000 Hz.
This is the same confusion that we are seeing in the discussion of
broadband speeds between "b" and "B" for "bits" and "bytes",
respectively. In this case, the difference is a factor of eight and
it especially confuses people when they buy broadband in
megabits/second and the upload/download software reports throughput
in kilobytes/second.
Cheers,
Richard
Richard L. Hess
Aurora, Ontario, Canada http://www.richardhess.com/
Detailed contact information: http://www.richardhess.com/tape/contact.htm
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