Hi there,
My waveforms have been looking like this lately consistently, I have never noticed this before. Is it something to do with my RS4D or some sort of new local noise? They are random spikes and they sort of form a U shape - dipping downwards.
Hi there,
These are the latest, and have low frequency range like distant quakes but they dont seem to be earthquakes.
Hello VS1,
Yes, some of them seem artificial in nature, especially in these images:
Is it possible that new machinery, or some kind of work, has been installed/is being performed near your location, and the Shake is now recording it?
For the others, you can try to see if they repeat at approximately the same time every day, or with a particular timing cadence. Or, if there is something new in your neighbourhood that could be causing these noises.