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The options provided by the waveform viewer are described in Figure 2: When clicking on one waveform, additional options appear.

Figure 2.

1. The user selects the component(s) that he/she wishes to be displayed in the screen. East-West, North-South, Vertical.
2. Horizontal zooming in-out.
3. Vertical zooming in-out.
4. Undo zooming.
5. Select between phase (start and end point) picking and single point picking.
6. Select between P-wave and S-wave picking.
7. Collapse the details of the waveform.Undo picking.
8. Horizontal zooming tool. The User may alternatively zoom in-out the waveform by clicking on this small vertical bar and move the mouse left-right.
9. Collapse the details of the waveform.

Picking Phase for Waveform Analysis:

The User has to select "Phase" and "P" options from the fields 5 and 6 of figure 2 for the Vertical component of a station (**Z channel) and "Phase" and "S" options from the fields 5 and 6 of figure 2 for one of the Horizontal components of a station (**N or **E channel).

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Then he/she has to pick the starting and ending point that wishes to use in Spectral Analysis (Figure 3).

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Figure 3.