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This application uses acceleration miniseed files as input to calculate the response spectra. If the user's data is in velocity, it can be converted into acceleration using the MseedToMseed application. 

Inputs

1. Acceleration in miniseed format

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2. Damping factor [0.00, 0.99]
   • Also known as a damping ratio.
   • Describes how vibrations decay over time. Generally response spectrum amplitudes will decrease when the damping ratio is increased.
   • Default is 0.05 for 5%, as most ground motion models are developed for a reference damping value of 5%.
   • Values ranging

1. • from 0.5% to 30% are not uncommon.
2. Maximum acceleration period [s] (min. 0.00) 
   • The maximum value of the horizontal axis in the 'SA' and 'PSA' plots
   • Default is 4 seconds
3. Maximum velocity period [s] (min. 0.00) 
   • The maximum value of the horizontal axis in the 'SV' and 'PSV' plots
   • Default is 4 seconds
4. Maximum displacement period [s] (min. 0.00) 
   • The maximum value of the horizontal axis in the 'SD' plot
   • Default is 10 seconds

Outputs

Plots in png format and data values in csv format for:

'SA'  : Acceleration Spectra

'PSA' : Pseudo-acceleration Spectra

'SV'  : Velocity Spectra

'PSV' : Pseudo-velocity Spectra

'SD'  : Displacement Spectra

The plots are of spectral response vs period, where the maximum period shown can be configured using the input parameters. Typically for displacement, up to 10 seconds is shown and for acceleration and velocity, up to 4 seconds.

Pseudo-acceleration and pseudo-velocity spectra are approximations calculated directly from the displacement spectra.

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