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Data Handling Applications are distinguished from Data Processing Applications because they perform relatively simple data transformations, resulting to data as well. On the contrary, Data Processing Applications perform specific analyses and methods, utilizing data in order to produce more sophisticated results, not just simple data elaboration/transformation. The Data Handling Applications available in the IS-EPOS web platform, are described in this section:

• SEED to SAC Converter
• Ground Motion Parameters Tool
• Seismogram picking tool
• Catalog Filter
• Magnitude Conversion
• Signal download tool 
• Waveform Download tool
• Time-Series Builder
• Catalog Export
• GDF Export
  
  
  Description of Data Handling Applications:

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As soon as the filtering criteria have been defined, the User shall click on the 'RUN' button (green button at the bottom of Figure 5) to apply the those criteria. The User may also select the 'Preview Selection on map' tab (indicated by the green frame, at the bottom of Figure 5) in order to view an illustration of the events from the original catalog (red circles) and the events included in the filtered catalog (green circles). A new catalog ('catalog.mat') has been created and it is available for any further processing. In addition the system provides all the information and applications that are valid for the original catalogs (see "AH Episodes" Chapter, for details). 

•  Magnitude Conversion

'Magnitude Conversion' is a application used for establishing linear relationships between different magnitude scales, which can be later used for conversion of magnitudes from one scale to another. The input file is the seismic catalog that can be uploaded from 'Change Input' tab (shown on right side of Figure 7). The application can be performed only in datasets in which more than one magnitude scale (or, alternatively, 'Energy' or 'Seismic Moment' can be introduced as inputs as well) is assigned for the seismic events (e.g. ML and Mw). The parameters that the user has to set/choose are also shown in Figure 7:

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Figure 8. Output plot produced by the application

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•  Signal download tool

This applications extracts seed files and event files from a selected catalog into the User workspace. These extracted files can be used later on at any application dealing with waveform processing, including 'Spectral Analysis', 'Source Location', 'Moment Tensor Inversion' and 'Seed response calculation'. This is an alternative way of exporting seed files instead of searching into the episode database. The User needs first to select a catalog from the workspace and click subsequently on 'ACTIONS', 'USE IN APPLICATION' and 'Signal download tool' tabs, as indicated by the red boxes in Figure 9.

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After this step, the list of events appears in the screen as shown in Figure 10 and the User is requested to select an event for extracting event information and seed file. The User may also chose downloading between 'Seed Signal', 'Accelerogram Seed Signal', or 'All', by ticking on the respective box shown at the bottom left corner of Figure 10.Then, the output files are extracted after clicking on the 'RUN' button (green button, bottom Figure 10). Those files are stored in a Signal Download folder, into the User's workspace and can be further used as input in several applications as mentioned above. 

Figure 10. Selection of waveform data from the catalog
 

•  Waveform Download tool

This application allows for ordering parts of continuous waveforms for specific dates and stations as processed by Seiscomp. The User needs to upload the application from the applications repository to the personal workspace. The preparation of the waveform is executed by Arclink-fetch. The User has to select the respective episode and time period of interest, (as shown in Figure 11). For selection of the the time period the User may either set values to the 'Start' and 'End' point, or specify the 'Start' point and the duration (length) of the periods he/she wishes to study. After this the User selects among the channels and the stations available for each episodes and clicks on 'RUN' button. A *.seed file is soon to be created, and it can be furthered processed within other applications, such as: 'FOCI', 'Waveform Analysis' or 'Seismogram picking tool'.

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Figure 12. Input of the application

Figure 13. Interactive data selection

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Figure 16. Input and output of the application