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Telluric "Sounds"
Because of the extremely slow variation in data which is collected at 1 sample per second, I used a well-known technique for presenting the data in a more digestible form. The original 1 sample per second data is converted into a WAV file for play back. The effective sample rate is 4000Hz, therefore the data is speeded up by a factor of 4000. To allow you to listen to the results of this exercise here is a WAV file (218Kbytes). This file compresses the data from just over 30 hours into a playing time of about 30 seconds. For those who have Real Player here is the same set of "sounds" in a real audio format (60Kbytes). Note the rhythmic nature of the data. It reminds me of the beating of the shields in the movie "Zulu". The whistle you can hear is the 4.5 second period sinusoidal signal speeded up to about 900Hz. The rhythmic beat is a mystery. Below shows a short segment of the data which produces this effect:-
Note the similarity of the consecutive waveshapes and the long period (remember the data is speeded up by a factor of 4000). What produces this I don't know. The regular nature of the data indicates a man-made source, but what ? The 4.5 second signal may be related to microseisms - or not. Here are two more runs in WAV file format:- tell_2.wav and tell_3.wav and in real audio format:- Update 7 Dec'00: I have taken a record of signals over about 2.5 days and there is a definite 24 hour repeating pattern (see below). The starting time is very close to midnight local time (when correcting for DST) and the pattern repeats with a macro-structure of 24 hours. Obviously man-made but I still don't know what it would be. The definite repeating macro-pattern has me mystified. Now if more accurate time-keeping measurements reveal that the pattern actually repeats in 23 hours and 57 minutes, well of course that would mean it would have to be an alien transmitter (yes I AM joking Marco :-()
If you have any ideas let me know by email. Go here for responses to comments that have been received.
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