Seismic Toolkit is a tool for processing and displaying seismic signal data in a graphical interface. It reads seismic signals in SAC format, and provides a variety of signal processing, such as filtering, spectral analysis, polarisation analysis, time-frequency representation, Hilbert transform, and singular value decomposition. Some utilities are included for useful seismological applications, like computation of Seismic Moment Mo, Mantle magnitude Mm and Moment magnitude Mw, MTPA spectral analysis, plotting focal mechanisms, computation (and plotting) of instrumental response from poles and zeros, and some usefull GMT (Generic Mapping Tool) scripts for plotting signals, responses, and time-frequency in Postscript files for high quality prints. License: GNU General Public License (GPL) Changes: Documentation has changed with all downloads made from sourceforge.net. Computation of Fourier Series was added in the Fourier menu. An estimated waveform is plotted from the Fourier series; coefficients of Fourier and modulus of spectrum are written in text files in the directory pointed by STK_LOG.

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