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Hi Marc,

I have a dataset that we are quite unsure if the peak that we are seeing in the vertical component is of industrial origin. I have been testing this hypothesis using damping toolbox but I am not quite sure of which filter method to use - Butterworth vs Cosine taper.

I have tried using a cosine taper and it verifies that our industrial origin hypothesis, however, using a Butterworth filter gives an opposite result. I used a very narrowband frequency as suggested in the documentation here with 10 s window and fitting length.

Please let me know what you think on the ideal filter parameters. Thank you, as always

Hi Leandro,

It looks like that the width of the cosine filter is too small. The damping effect always disappears if the width tends to 0 because the signal reduces to a sine or a cosine function. Try to enlarge a bit the bandwidth and check if the damping is increased.