Think it likely was a 5.6 from the central east pacific rise.  Reported 
on the NEIC web site.  Check the following link to the event page

     
http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0005zmk.php

I recorded this event here in central NY, but I didn't get a very good 
record.  Just enough to catch my attention on my monitor.

Larry Conklin
Liverpool, NY

On 9/23/2011 9:51 PM, Richard Schneider wrote:
> Good Evening,
> 09/23/2011 1925 GMT - Unusual event that lasted for about 12 minutes 
> or so on my helicorder here in Camarillo, CA. High energy 
> motion noted in the FFT 4 to 8 second range.
> Not reported by USGS as an event. But recorded by several of their 
> stations from Santa Barbara to the Salton Sea.
> Any ideas as to what caused this disturbance?
> Rich S.
> KCMA IRIS Network
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