NEEShub services are beginning to be phased out. Please begin using DesignSafe ( Please submit a support ticket ( if you need any assistance.


Support Options

Submit a Support Ticket

You are here: Home » Tools & Resources » Tools » SigmaSpectra » About


Semi-automated ground motion selection which scales time series to fit a target response spectrum and standard deviation.

Launch Tool

You must login before you can run this tool.

Version r93 - published on 22 Mar 2013

Open source: license | download

View All Supporting Documents

    Input Window Suite Selection



Published on



SigmaSpectra is a computer program that selects suites of of earthquake ground  motions from a library of ground motion such that the median of the suite  matches a target response spectrum at all defined periods, and then scales the  suite such that the standard deviation agrees with the target standard  deviation. The success of the SigmaSpectra in matching the target response  spectrum and standard deviation depends on many factors including: the size of  the requested suite, the number of motions in the ground motion library, and the  appropriateness of the target response spectrum and standard deviation to the  motions in the library. 

Current versions:

Windows Installer

Powered by

Qt, Qwt, FFTW, GSL


A Semi-Automated Procedure for Selecting and Scaling Recorded Earthquake Motions for Dynamic Analysis
Albert Kottke and Ellen M. Rathje, Earthquake Spectra 24, 911 (2008), DOI:10.1193/1.2985772

Cite this work

Researchers should cite this work as follows:

  • Albert Kottke; Ellen M. Rathje (2010), "SigmaSpectra,"

    BibTex | EndNote