Seismosoft | Earthquake Engineering Solutions

In the help document of SeismoSignal, the baseline correction is introduced as follows:

"Baseline Correction, as implemented in SeismoSignal, consists in (i) determining, through regression analysis (least-squares-fit method), the polynomial curve that best fits the time-acceleration pairs of values and then (ii) subtracting from the actual acceleration values their corresponding counterparts as obtained with the regression-derived equation."

The saying , quotes "the polynomial curve that best fits the time-acceleration pairs of values" , seems inaccurate. To my knowledge, in order to to remove the shift of displacement time-history, we try to find the polynomial curve that best fits displacement time-history pairs of values other than that of the time-acceleration. Perhaps my understanding is wrong.
Looking forward to one explanation. Thank you.

Dear seismech,

We can confirm that filtering and baseline correction are indeed applied to the acceleration time-history, even when the end objective is that of eliminating residual shifts from the corresponding displacement time-history (obtained through double-integration, in time, of the accelerogram).

Seismosoft Support