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The following files are necessary in order to perform the source location, as shown in Figure 1:

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1. 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).
2. Catalog: The User selects a Seed file from the Episode database (See "AH Episodes" chapter)

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1. Seismic Event. The User select a seismic event which has been downloaded after applying the ‘Signal Download Tool’ (

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1. Figure 2, see “Data Handling Applications” chapter).

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2. Seismogram picks: P-wave first arrival picks, selected by the User from the waveforms (described below)
3. Velocity Model. Velocity model uploaded from the Geological data of the selected Episode (see "AH Episodes" chapter).

Now, all data needed is available for the TRMLOC application.

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Figure 1.

The TRMLOC application can be selected from the seed file as shown in Figure 1b:

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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 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 service 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 additional input parameters required to execute the service are shown in Figure 3. Some of those parameters take numerical arguments, printed by the User, others take values selected from a list. In any case default values are provided. Advanced options are also available, however the service runs properly even if they are discarded. For detailed description of all service parameters please see at the trmloc manual at the document repository (link….)

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Figure 3.

Once the point picking in the waveforms and the parameter selection is over, the User shall click on "RUN" (green button, left bottom corner of Figure 3) to initiate the Source Localization process.

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