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The options provided by the waveform viewer are described in Figure 4: When clicking on one waveform, additional options appear.

Figure 4.

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 Only P-wave is enabled in this Application. (In other Applications, selection between P-wave and S-wave picking are possible).
7. 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.
10. Move the selected (zoomed) part of the waveform left-right.

Picking Phase for Waveform Analysis:

The User has to pick a starting and an ending point from the Vertical component of a station (**Z channel - see Figure 5). Then, he/she has to repeat this picking for the other stations.

NOTE: Although it is not necessary to pick P-wave arrivals in all of the waveforms, a minimum of 8 picks is required for the service to proceed to the calculations (stated also at the bottom of Figure 5). The number of the seismograms and P-wave phases picked, are updated, each time the User selects makes a new picking.

Image Added

Figure 5.

Parameters selected for the waveform inversion: