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- Seed Waveform. The User selects a Seed file from the Episode database, or after applying the ‘Signal Download Tool’ (Figure 2, see “Data Handling Applications” chapter).
- Catalog: The User selects a Seed file Seismic Catalog from the Episode database (See "AH Episodes" chapter)
- Seismic Event. The User select a seismic event which has been downloaded after applying the ‘Signal Download Tool’ (Figure 2, see “Data Handling Applications” chapter).
- Seismogram picks: P-wave first arrival picks, selected by the User from the waveforms (described below)
- Velocity Model. Velocity model uploaded from the Geological data of the selected Episode (see "AH Episodes" chapter).
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Now, all data needed is available for the TRMLOC application.
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The TRMLOC application can be selected from catalog or from the seed file as shown in Figure 1b:
Figure 1b.
Once all these files are selected, a map appears on the screen showing the epicenter of the selected event (red circle) and the locations of the seismic stations comprising the regional network (green triangles), as demonstrated in figure Figure 2. Information on the event and the stations appears on the screen, after clicking on the circle or the triangles, respectively. Moreover, the waveforms are also shown in the screen and are available for elaboration (see also Waveform viewer guide" in "Visualization" chapter). As depicted in Figure 2, only the vertical channels are shown by default, since the methodology applied in this application uses only P-waves. Nevertheless, the User can make all the channels appear on the window, by ticking the "E" and "N" components, next to the "Show channels" field, just below the map in Figure 2.
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The results obtained after the process terminates include a variety of output values, files and figures (Figs …). Numerical outputs are the hypocenter coordinates obtained by different methods, their uncertainties and the original coordinates from the catalog, for comparison (Figure 4, top). These values are also plotted in charts, one showing the epicentral location (longitude-latitude) of the original and obtained solutions together with the stations positions (Figure 4, bottom), and one more showing the vertical (depth) distribution of the aforementioned solutions. Four ascii files are also created (log.txt, res.txt, xcp.txt, and out.txt), which contained detailed and specialized information on the process, the results and their uncertainties (see trmloc manual for details, at the document repository - link). These files can be either displayed in the screen or downloaded by 
the User,
Figure 4.
Overview
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