Seismic Toolkit 0.45 review

Plot SAC ASCII and SAC_BIN data format, with zoom,unzoom, plot channel by channel, or plot all channel (until 2000, tested with 125).

License: GPL (GNU General Public License) File size: 3548K Developer: Dominique Reymond

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Plot SAC ASCII and SAC_BIN data format, with zoom,unzoom, plot channel by channel, or plot all channel (until 2000, tested with 125).

Filtering the data: all filters are causal recursive IFR (Infinite Impulse Response) written using the bilinear Z-transform in the time domain. Their conception using a few number of coefficents gives them very fast with a low memory cost.

The adaptation factor of frequency warants no deformation in the frequency domain of the transfert function. The main filters used are the following: Butterworth High-Pass and Low-Pass (n order), Farrer 10s-6s Low-Pass (a combination of rejector and Low-Pass specially designed for removing oceanic noise), Integrator, Derivator, Integrator with cut-off frequency, Derivator with cut-off frequency, Trend removing, Rejector (n-order), Envelop with Hilbert (not recursive at all), compensator of (n-order), Polynomial filter (n-order, not recursive at all ).

Data plotting : channel by channel, all channels, zoom, unzoom, unfilter, instantaneous time and amplitude informations with mouse pointer.

Fourier domain: Power Spectral Density (PSD) in linear-linear, log-log axes; independant windows for each channel, instantaneous frequency and amplitude informations with mouse pointer, zoom, unzoom of spectra. Dirac, Hilbert transform, Time-Frequency representation (tested until 1 million of points per channel on 3 channels.

Polarization : easy and fast particule motion representation in both horizontal plane and incidence plane, with automatic computation of best direction with eigen vectors of the covariance matrix. Display of linearity and planearity coefficient.

What's New in This Release:
MM_mag, in Utilities Programs, accepts 7 arguments, including origin time, latitude, longitude, and directory of signals.
This greatly simplifies the way of running the process, instead of changing a configuration file.
A new program aziX (in Utilities), provides a very easy tool for computing azimuth, distance, and back-azimuth with a simple list of station names.