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Hello! I am using the H/V method in Geopsy.
I am currently analyzing the peaks that I obtained from my data, in these I observe a 33 Hz frequency peak that is maintained throughout 1 year and also throughout the entire day.
I analyzed the spectrum of my raw data to determine if it is of industrial origin (suggested by SESAME). I observe a peak at that frequency only in the East and North components; in the vertical component (Z) I do not observe anything.
Is this enough to suggest that this frequency is of industrial origin?

I appreciate any suggestion.

Can you post a figure of the spectra?
Did you try the random decrement technique (damping tool) to check if it is sustained or not?

hello! thanks for your quick response.
Attached is corresponding spectrum.
I also tried the random decrease technique on my data(an entire day), but I don't know if I used the correct parameters.
I apply a bandpass filter between 32 and 34 Hz. As a filter, I used the butterworth filter with an order of 4. And finally I used a window length and fitting length of 0.4 s.
I would appreciate if you can confirm if I am applying the method correctly.

kind regards.

Your spectra look very smooth. Can you post a screenshot of the smoothing parameters in the spectrum toolbox?

Usually peaks from machinery are very localized in frequency. Unless smoothing is too strong, your spectra do not look like being affected by a clear artificial source.

The damping signals you calculated are attenuated after a few cycles which means that the phase is not constant over time.

Hello, thank you very much for your help.
I attach the images corresponding to the smoothing parameters and also different variations of it (5%, 10%, 20% and 40%).

King regards