Geoff,
I have stood outside and timed an event to be sure it was coming from 
the lake. My lake is connected to another lake via a 12 inch underground 
pipe. I believe the production of oxygen by algae creates pressure 
because the most events are in the morning and early evening.  The 
display is distinctive Go to and see some pic

http://www.facebook.com/home.php?#!/thomas.p.dick 


__________________________________________________________

Public Seismic Network Mailing List (PSNLIST)

To leave this list email PSNLIST-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.