Hi Tony, thanks for the comments.

I believe that the signals that I work with represent earthquake fault zone activity and perhaps geomagnetic field related electromagnetic energy field fluctuations. Most last from 0.25 seconds to perhaps 20 seconds. And I would expect that most other researchers would have a difficult time detecting them because they would probably look like background noise. I usually list data related to them at my 131.html Web site and not elsewhere. However I posted a note about that particular signal to several bulletin boards because it was unusual in that it was especially strong and probably had a duration time of at least 4 hours. I am guessing that it was related to fault zone activity. But it would be difficult to tell for sure if that was actually the case.