The program has 7 main functions irrespective of type of input as illustrated below with the questions given by the program:
Plot options: Interactive picking Return Multi trace plot on screen, def (0) Multi trace plot on screen (1) Multi trace plot on screen+laser(2) Multi trace plot on laser (3) Continuous on screen (4) Continuous on screen + laser (5) Continuous on laser (6) Stop (9)
|Return:||Picking phases, spectral analysis and 3 component analysis|
|0:||Initial plotting of new waveform data and registration in database using predefined defaults. Phase picking.|
|1:||Initial plotting of new waveform data and registration in database, or general plotting of multi-trace data. Phase picking. In this mode, the user is asked to select which channels to work with and a graphical window will be shown for selection. If more than 250 channels are available, selection will have to be made on several screens. A maximum of 1000 channels can be used. Optimally, channels can be show in alphabetical order (see MULPLT.DEF).|
|2:||Same as 1, only hardcopies may be made at the same time.|
|3:||Making hardcopies of many waveform files with one command. No screen output.|
|4,5,6:||Plotting one channel continuously like on a seismogram with several traces from left to right on top of each other. One channel can be selected. Time windows can be selected for event extraction.|
For continuous data, see 2.2.2 and 8.5.
Commands f and q: With a plot on the screen, q will always quit mulplt. F will, in single trace mode, bring up the next channel, in multi trace mode bring up the next event.
Option 0 is particular useful for checking many new events, since the program does not ask question about station choice (uses definition in MULPLT.DEF file in DAT, or working directory) and typing f (when the plot is on the screen) automatically goes to the next file in filenr.lis.
If option 1,2 or 3 is used, a display will show the available channels and the user can click to select. If MULPLT is operated from EEV, a * in a channel box will indicate that readings are available. NOTE: The channel will be marked if only the orientation code is matching. When the channel selection is shown, it is possible to quit the program with q or continue with f.
If option 4,5 or 6 is selected, continuous data is plotted, see below.
Running MULPLT using command MULPLT, the program asks for a file name or file number of a waveform file. To use the number, it is assumed that a list of interesting files has first been created and numbered in a file filenr.lis using command DIRF, see section 15. By giving the number, the file corresponding to the number is used. By giving a ?, the list with numbers is displayed and a new number can be given. If many files are to be plotted with one command (hard copy only), give filenr.lis for file name and all events in FILENR.LIS will be plotted. There will only be one question about filter and then all events are plotted with all channels and the chosen filter.
Hardcopies assume a PostScript printer. For each event plotted, a plot-file called mulplt.eps is generated. The plot files are sent directly to the printer from within the program with the seisan print command as soon as the plot is finished for one event but before the program is finished. In Unix, this is lpr or lp while on PC, the command is given in a .bat file in COM (see installation section). This means that the same plot-file is overwritten for each event plot. For setting up the printer, see installation, chapter 3.
In multitrace mode, many traces (number limited by the SEISAN system definitions, see chapter 3) can be plotted. If the plot is made via EEV, all picks are also displayed.
Location of waveform file:
Mulplt will search in current directory first. If not found there, the WAV directory is searched. If the SEISAN.DEF file has been set up, MULPLT will thereafter try to locate the waveform file in one of the databases or specific directory given in the SEISAN.DEF file (located in DAT or working directory).
Format of waveform files:MULPLT can, on all platforms, use SEISAN, GSE, SAC ASCII and binary, GURALP (one channel files), HelMberger Format and SEED. If started from EEV, files in different formats can be used at the same time.
Time gaps in waveform files:
Only SEED format has running time headers and therefore the only format where a possible time gap, in one file, can exist. SEISAN will replace missing data intervals with zeros. For a SEISAN continuous data base, it is assumed that a gap of less than 2 s between files is not a gap. Larger gaps will be replaced by zeros.