〰 Ground Motion Processor — PGA · PGV · PGD

GroundMotionGUI v1.1 · University of Pardubice · TA CR – SIGMA

🇨🇿 TA CR – SIGMA / M.ERA-NET Cofund
Technology Agency of the Czech Republic
Acceleration Records
Text / CSV / AFAD .asc / PEER .AT2 — headers auto-skipped. dt and units are read from the header when available.
Record dt (s) N Units
No files loaded.
Acknowledgement
This tool was developed within the framework of a project co-financed from the state budget by the Technology Agency of the Czech Republic under the SIGMA Programme within the M.ERA-NET Cofund.
Citation
Yurdakul, Özgür (2026). GroundMotionGUI: A web-based tool for baseline correction, filtering and PGA/PGV/PGD computation of accelerograms. Faculty of Transport Engineering, University of Pardubice. Available at: https://ozguryurdakul.github.io/seismic-tools/groundmotion.html
Related Tools
⚡ Response Spectrum Calculator
⚡ Response Spectrum Scaling
Defaults: linear baseline + Butterworth band-pass 0.1–25 Hz, order 4 (SeismoSignal's default filter settings). PGD depends strongly on the low cut-off — always check the fc sweep on the Results tab.
Baseline Correction (on acceleration)
Polynomial order:
Pre-event mean (s):
If > 0, the mean of the first N seconds is removed instead of the polynomial.
Cosine taper (s): each end
Filter (Butterworth)
Type:
Low cut-off fc (Hz):
High cut-off (Hz):
Must be below Nyquist = 1/(2·dt), e.g. 25 Hz for dt = 0.02 s. If it is not, it is lowered to 0.8·Nyquist automatically.
Order (per pass):
Phase:
Acausal = forward + backward pass: effective order 2×, −6 dB at fc.
Integration
Displacement drift fix:
Fits a polynomial to displacement and removes its 2nd derivative from the acceleration, so a, v and d stay consistent.
fc Sensitivity Sweep
fc values (Hz):
No results yet — load a record and click Process.
Show: