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This service determines seismic source parameters based on spectral analysis of the P and S waves.

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

1. Using Seed Waveform. The User selects a Seed file from the Episode database, or after applying the ‘Signal Download Tool’ (Figure 2, see “Low Level Services” chapter).
2. Using Velocity Model. Velocity model uploaded from the Geological data of the selected Episode (see "AH Episodes" chapter).
3. Using Seismic Event. The User select a seismic event which has been downloaded after applying the ‘Signal Download Tool’ (Figure 2, see “Low Level Services” chapter).

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Figure 1.

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Figure. 2.

The Spectral Analysis application can be selected from the seed file as shown in Figure 2b:

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Figure 2b

The input file needed for Spectral Analysis Application is a *.seed file. After selecting a seed file from the episode database, the User has to enter the workspace, click at "Actions", then "Use in Application" and then "Spectral Analysis" as shown in Figure 1.

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Figure 1.

The User now needs to seek for the seismic event corresponding to the uploaded seed file. In doing so, the User has to enter the episode seismic catalog and click on "Actions", then "Use in Simple Component" and then "Event Chooser". Then, from the "Event Chooser", select the appropriate event and click on the "run" tab to extract the associated data. The seismic event can be now uploaded for the Spectral Analysis.Alternatively, the User may upload the respective seed file, once he/she has already selected an event from the catalog by the "Event Chooser" service.The User has just to click on the "Event Chooser", then on "Seismic Event" (shown in the green panel at the left bottom of Figure A1) and then select "Actions", "Use in simple component" and "SeedSearch" (steps indicated in the red boxes, Figure A1). Finally the User has to upload a velocity model, available in the AH Episode data base. After this process a simple click on the "Run" that will appear on the screen will upload the appropriate seed file, associated with the previously selected seismic event. Now, all data needed is available for the Spectral Analysis application.

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