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This document contains instructions for running application Response Spectra within the EPISODES Platform. The application computes the response spectra of acceleration data time series using the Duhamel integral technique. Adapted from code originally written by Loïc Viens.

To obtain more general information about working with applications within the Platform, see Applications Quick Start Guide.


CATEGORY Source and Shaking Parameters Estimation

KEYWORDSResponse spectra

CITATION If you use the results or visualizations retrieved from this application in a publication, then you must cite the data source as follows:

Viens, Loïc and Marine A. Denolle (2019) Long‐Period Ground Motions from Past and Virtual Megathrust Earthquakes along the Nankai Trough, Japan. Bulletin of the Seismological Society of America, 109(4), 1312–1330

Orlecka-Sikora, B., Lasocki, S., Kocot, J. et al. (2020) An open data infrastructure for the study of anthropogenic hazards linked to georesource exploitation., Sci Data 7, 89, doi: 10.1038/s41597-020-0429-3.

TODO


Description of inputs:


Acceleration in miniseed format

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 ranging from 0.5% to 30% are not uncommon.


Outputs

Figure of a plot 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 response vs period, where the maximum period shown can be configured. Usually for displacement, up to 10 seconds and for acceleration and velocity it is shown to 4 seconds.


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

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