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.