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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 services that are valid for the original catalogs (see "AH Episodes" Chapter, for details).

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This Application is performed in order to transform the epicentral location of the seismic events into a selected Cartesian Coordinate System (Note that epicentral location data available in IS-EPOS is given in geographical coordinates). The available types of coordinate systems are shown in Figure 7. Once the User makes the selection and clicks on the "Run" button, a new catalog is created, which contains all the data previously available in the original catalog, plus the seismic events epicentral location in the selected Cartesian system. The new catalog is stored in the platform and is available for any further processing. In addition IS-EPOS provides all the information and services that are valid for the original catalogs (see "AH Episodes" Chapter, for details). 

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Figure 7.

•  Magnitude Conversion

Magnitude Conversion is a service 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 in upper on right corner side of Figure 87). The Service can be performed only in datasets in which more than one magnitude scale (or, alternativelly, 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 87:

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Figure 87.

• Choose first vector to compare: The user may choose among the different magnitude scales available in the catalog.
• Choose second vector to compare: The user may choose among the different magnitude scales available in the catalog.
• Regression Method: Three different regression methods can be used - General Orthogonal Regression, Standard Least Squares and Inverted Least Squares.
• Error Variance Ratio: A float number should be assigned here (default is 1). Note that this option is only valid when General Orthogonal Regression method, is chosen.

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•  A report with the parameters (slope and intercept) of the regression process and some associated statistical parameters (Figure 87)
• Vectors of the first, second magnitude selected, together with the vector of the new (converted) magnitudes obtained by the application of the regression equation.
• A figure with one magnitude scale plotted versus the other one (scatter plot) and the linear regression curve (Figure 98). Zooming option is enabled for this Figure.

Figure 98.

•  Signal download tool

This services extracts seed files and event files from a selected catalog into the User workspace. These extracted files can be used later on at any service 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 SERVICE and Signal download tool tabs, as indicated by the red boxes in Figure 10.

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