FYI,,   I noticed a strangeness in the background noise today as I was checking my
traces, so I did an FFT and discovered that they had a period of about 8
seconds,,   as compared to the normal 4.5 to 5.5 that I've noticed over the years
for Northern California!    Anyone have any idea why????    Could this be caused
by the hurricane,, or is something else going on???   I verified that it was not
my machine by checking with the Berkeley "make your own seismogram" link!!

http://quake.geo.berkeley.edu/bdsn/make_seismogram.html

I haven't noticed such long period microseisms before,,,   perhaps I just wasn't
looking??

  Stephen
  PSN Station #55
  near Pilot Hill Ca
  38.828N  120.979W
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