My RS4D just recorded these and I am wondering are these local tremors or something else like a blast? The waveform does look a little peculiar, different to other quakes the but sprectrogram looks similar to an earthquake. Any thoughts? Attached are the waveforms in question.
It seems a bit repetitive, with a set interval. Are those three the only instances of such signal, or is there more during the day/night?
Also, the appear quite identical in waveform type, with consecutive positive/negative/positive peaks. It’s worth keeping an eye on these to see if they happen again, as I think they are generated by some apparatus in your vicinities and are not actual seismic signals.