reply to post by supertrot
I can assure you that the signals you see are absolutely nothing to do with the sink hole
The second I saw the signature I knew what it was - TRAINS. The railway track is a fraction over 2 km from the seismo location.
Approx location of rail
You can see it running right alongside the road.
ETA: If you have the time and can be bothered you should be able to get hold of timetable and at least match up the passenger trains to the signals.
Obviously you will not get a goods schedule.
By the way the ONLY seismos you should be looking at for the sinkhole at the LA seismos. They too suffer from traffic noise by the way. (Smaller
versions of those big ones on the other seismo).
Also, HT is long and continuous and NEVER looks like that. Here is HT from El Hierro
Google search harmonic tremor
Click on images and you will see any examples.
There are however many other things that can look like HT on a seismo so if in doubt - ask. The only way HT can be identified properly is to run a
Fourier analysis on the signal to extract the harmonics.
edit on 20/11/2012 by PuterMan because: (no reason given)