Hi,

Normally I just dismiss these occassional spikes - I don't think I'm sleep
walking!  Your email has prompted me to look at the data though, see
http://www.iasmith.com/spike.jpg   It looks like it might be real.  The
frequency analyses shows it peaks around 4.5 Hz, which is the frequency spec of
my geophone, so not a
digitisation/amplification artifact.  I'm only 20 miles from the worlds "most
active" volcano, so it probably twitched, again.

cheers

Travis Farmer wrote:

> on the first line at about the 57 minute mark, it looks like somebody fell
> off a ladder or something. although by the time, I don't think they were at
> work. Did you fall out of bed? seems like something happened, it's a pretty
> big spike.

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