13 Feb 2013
It is reported that the heavy signal that we are seeing on the HHZ channels is works trucks. By selecting one at random and ‘tweaking’ the vertical scale so the signal is not so distorted we can see it much more clearly.
I would not be prepared to categorically state that it is not ‘works trucks’ but I have my doubts. That it is anthropogenic is not in doubt however.
06 Feb 2013
Strange signal on two channels of LA13 on the 6th February.
Nothing out of the ordinary on the HH1 channel. The disturbance at the start is the Mag 8.0 in the Santa Cruz Islands.
This signal is visible on the HH2 channel and the HHZ channel, but if you look closely the signal is not the same on both.
This one shows the signal ‘self-scaled’ and it makes the pattern very clear.