> 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

Hurricane huh, must be hitting Hawaii pretty hard, have a quick look at LISS
http://aslwww.cr.usgs.gov/Seismic_Data/telemetry_data/KIP_24hr.html before
it expires or at a cached version at
http://203.79.120.108/hawaii.200205302156.gif

Mark

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