B
Bret Cahill
Guest
Why stop at milli Hertz?
Bret Cahill
Bret Cahill
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J
John Larkin
Guest
On Fri, 21 May 2010 21:59:52 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:
a few centuries.
John
<BretCahill@peoplepc.com> wrote:
Use femtoHertz. That way, you can predict earthquakes to resolution ofWhy stop at milli Hertz?
Bret Cahill
a few centuries.
John
W
whit3rd
Guest
On May 21, 9:59 pm, Bret Cahill <BretCah...@peoplepc.com> wrote:
first on the timescale of centuries, and on the timescale of weeks.
No
one knew which hour or day, until it happened.
The geological record was what gave assurance it'd pop 'about now'
meaning this-half-a-century. The preliminary seismic
rumblings were why there were weeks of advance warning (and
why preparations and evacuation were achieved).
The only 'stopping' was at a few deciHz in the low frequency band,
because
the mechanical seismometer movements are tuned for that (it
has better signal/noise than lower frequencies, and better range
than higher frequencies).
The Mt. St. Helens eruption of May 1980 was predicted accuratelyWhy stop at milli Hertz?
first on the timescale of centuries, and on the timescale of weeks.
No
one knew which hour or day, until it happened.
The geological record was what gave assurance it'd pop 'about now'
meaning this-half-a-century. The preliminary seismic
rumblings were why there were weeks of advance warning (and
why preparations and evacuation were achieved).
The only 'stopping' was at a few deciHz in the low frequency band,
because
the mechanical seismometer movements are tuned for that (it
has better signal/noise than lower frequencies, and better range
than higher frequencies).