General hints
Most of the procedures in the Digital Seismology Tutor require the interactive
input of certain parameters through input panels. Sometimes the user
might not be sure right away which input parameters for a particular procedure
might provide the best results. In this case he/she can check out the performance
of different input parameters without overwriting the input trace. Sometimes,
however, he/she just wants to go straight ahead and replace the input
trace by the result obtained from the selected procedure. These two options
are provided by the Apply and Ok buttons, respectively, which exist
for most of the parameter input panels.
Apply button
The selected procedure will be applied to the input trace and
the resulting trace is displayed (sometimes superimposing the input
trace). However, in contrast to using the OK button, the input data trace
is not replaced automatically. The input panel will remain open until
either the OK button or the Cancel button is pressed . This way input parameters
can be modified and the performance of the selected procedure on the input
trace can be tested for different parameters.
Ok button
The selected procedure will be applied and the result will
replace the input trace without the chance of further interaction.
The parameter input panel will be closed right away. Choose this
option if you do not want to test different input parameters on the
same input trace. In other words, if you know already that the input parameters
are OK.
Cancel button
he selected procedure will be canceled and the input
panel will be closed. The input traces remains unaffected.
Zoom horizontally
To zoom a trace trace in the horizontal direction (time axis),
press the left mouse button inside the trace and drag the mouse. The selected
part of the trace gets a yellow background. After releasing the mouse the
new trace is plotted. You can zoom the new trace again. To get back to
the last zoom step press F1. To get back the original trace press the right
mouse button or ESC.
Zoom vertical
To zoom a trace vertically (amplitude axis) press the SHIFT
button and than the left mouse button. Vertical zooming is always done
with factor 2. You can zoom the new trace again. To get back to
the last zoom step press F1. To get back to the original trace press the
right mouse button or ESC.