SeismicHandler - Waveform Analysis Tool

Menu entry FK

External program, code mainly written by T. Kvaerna and Jan Fyen.

Command to determine slowness and back-azimuth of a coherent teleseismic phase. It transforms all traces within the current time window in the main display into the frequency-wavenumber domain. The resulting range in this square domain is displayed in a separate window, the amplitudes (corresponding to wave energy) are coded in colors. A good result is achieved when there is a single, prominent maximum visible (yellow colors in the default setup). This maximum denotes slowness and back-azimuth of the investigated phase. Details of the FK algorithm can be found in ???.

After selecting the FK entry a dialog box pops up. Its parameters are:

After the computation of the FK matrix is finished a new window pops up. This has the following menu entries:

This FK option is an alternative to picking phases (manually or automatically) and calling Plane Wave. However, the suppositions for applications are the same:

Technical remark:

The computation of the FK spectrum is done by an external program located in the directory $SH_UTIL/fk_src. It is mainly written by other authors (see above) and it is Fortran code. Therefore it is not part of the SH/SHM program package. It has to be downloaded separately and compiled if no executable for your platform is available (see our ftp server ftp://ftp.szgrf.bgr.de).

This page last modified 6-Jul-2000