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Site Response Analysis with Python

Project description


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Site response analyses implemented in Python. This Python packages aims to implement many of the features found in Strata. These features include:

  • Input motion characterization:
    • Time series

    • Random vibration theory

  • Wave propagation or site amplification:
    • linear

    • equivalent-linear

    • equivalent-linear with frequency dependent properties

    • quarter wavelength

  • Nonlinear curve models:
    • Darendeli (2001)

    • Menq (2004)

    • Kishida (2012)

  • Site and soil property uncertainty:
    • Toro (1994) Vs correlation model

    • G/Gmax and D uncertainty:
      • Darendeli (2001)

      • EPRI SPID (2013)

Development of this software is on-going and any contributions are encouraged. Previously named pysra, but renamed after some sage and persistent advice to be better associated with Strata.


pystrata is available via pip and can be installed with:

pip install pystrata

If you are using conda and a create a pystrata specific environmental make sure you install ipykernels and nb_conda_kernels so that the environment is discoverable by Jupyter with:

conda install ipykernel nb_conda_kernels


Please cite this software using the following DOI.


There are a variety of examples of using pystrata within the examples directory. An interactive Jupyter interface of these examples is available on MyBinder.


v0.5.0 (2022-06-14)

  • Renamed to pyStrata.

v0.4.11 (2020-03-31)

  • Added: Depth dependent velocity variation model

  • Added: Output plotting functionality

  • Added: Ability to exclude soil type variation from bedrock

v0.4.10 (2020-03-27)

  • Fixed: Error in SPID variation of G/Gmax

  • Added: Scaling during read of SMC and AT2 input motions

v0.4.9 (2020-03-09)

  • Add InitialVelProfile and CompatVelProfile outputs

v0.4.8 (2019-12-11)

  • Remove Cython and cyko as dependencies

  • Added a numba based Konno-Ohmachi smoothing

v0.4.6 (2019-11-12)

  • FIXED #11: Dependencies missing on install.

v0.4.5 (2019-10-24)

  • FIXED #9: Wrong stress for some Menq components.

v0.4.4 (2019-05-22)

  • Incremented version because of issue with automated builds.

v0.4.3 (2019-05-22)

  • FIXED: Bug in

v0.4.2 (2019-05-22)

  • Incremented version because of issue with automated builds.

v0.4.1 (2019-05-22)

  • Fixed strain profile to use max_strain.

  • Changed README and HISTORY to markdown.

v0.4.0 (2019-03-11)

  • Added smoothed FourierAmplitudeSpectrum output.

v0.3.2 (2018-12-02)

  • Fixed building of docs.

  • Removed stickler.

  • Version double increment due to pypi naming conflict.

v0.3.0 (2018-11-30)

  • Converted all damping to decimal.

  • Added tests for KishidaSoilType.

  • Added tests against Deepsoil.

v0.0.1 (2016-04-30)

  • First release on PyPI.

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