ShakyGround

Clicking the “Response Spectrum” sheet your screen should display something similar to Fig. 10. You will note three fields, i. e. “Frequencies” “Type of Response Spectrum”, and “Damping”. In the “Frequency” field you indicate the highest and lowest frequency of the response spectrum together with the stepwidth of response spectrum calculation. Note that SHAKYGROUND [...]

The choice of the seismogram length and the digitization frequency requires some care. From the viewpoint of computing time and numerical exactness it is desirable to work with short seismogram length and, on the other hand, with high digitization frequencies. The attempt to match both demands at the same time, however, may cause problems [...]