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This service This application performs inversion of seismic first arrival time onsets, providing various hypocenter location estimations together with an advanced analysis of location uncertainties.

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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 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.

Figure 2.

In this service application the User has to pick a single point in each waveform (Figure 2), instead of a phase (i.e. two points, starting and ending). For the waveform processing details see also “FOCI” and “Spectral Analysis” chapters.

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The additional input parameters required to execute the service application 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 the application runs properly even if they are discarded. For detailed description of all service all application parameters please see at the trmloc manual at the document repository

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