User Guide_Stress Inversion

After selecting a catalog in the User's workspace, click on "Actions", then "Use in Application" and then "Stress Inversion" as highlighted in Figure 1.

An alternative approach to perform stress inversion, by computing and adding in the workspace the parameters one by one is appended at the end of the chapter.

For a comprehensive scientific description of the process and the parameters definition and constraints please visit http://www.induced.pl/msatsi)

Figure 1.

The following screen now appears (Figure 2) and the following fields, corresponding to parameter values and options, are requested to be fulfilled by the user:

Figure 2.

Using Seismic Catalog: The seismic catalog has been already selected in the previous step, however, the User may select another dataset from the workspace for stress inversion.

The number of valid mechanisms: This is an informative field showing the number of available focal mechanisms, such that the User knows about the sample size that is going to be analyzed.

Analysis Type: Three options are currently available in the IS-EPOS platform: 0D, 1D and 2D, and can be selected after clicking on the small arrow at the tab. If 1D or 2D options are selected, the user is requested to enter the parameter(s) and window(s) of X, or X and Y dimensions, respectively (Figure 3)

Figure 3.

Bootstrap Resamplings: Positive integer values are valid in this field, defining the number of Bootstrap Resamplings to be performed. 

Confidence Level: A number between 0 and 100 is requested, defining the percentage of confidence interval of the results.

PT Plots: on/off (Switches the plotting of P and T axes).

Advanced Options: A number of advanced options are available after clicking on the small box (Figure 4). See at the MSATSI manual for details (http://www.induced.pl/msatsi)

Figure 4.

Plot Type: The User may select one of the available options (accordingly to the Analysis Type) after clicking on the small arrow.

Confidence Intervals: The User may select one of the available options after clicking on the small arrow.

Rplot: on/off, plot can be activated/ deactivated by ticking or not the box, respectively.

Stereonet: on/off, off, plot can be activated/ deactivated by ticking or not the box, respectively.

Advanced Options: A number of advanced options are available after clicking on the small box (Figure 5). See at the MSATSI manual for details (http://www.induced.pl/msatsi)

Figure 5.

After choosing all the aforementioned parameters the User may click on "RUN" button to proceed to the calculation process. The results are soon to be available and saved by the system (Figure 6).

Figure 6.

(KOSTAS: other output not shown yet)

Alternative way for performing stress inversion.

The User may perform stress inversion by extracting and preparing the appropriate data, step by step as follows:

The User selects a seismic catalog and clicks on "Actions", then "Use in Simple Component..." and finally "CaseDimColumnExtractor" tabs as shown in Figure 7. A screen identical to the one shown in Figure 3 appears and the User is requested to choose an Analysis Type (0D, 1D or 2D) and set the appropriate parameters. If 1D or 2D options are selected, the user is requested to enter the parameter(s) and window(s) of X, or X and Y dimensions, respectively. Once the selection is made and the "Run" button is clicked the following parameters are created:

Figure 7

With the exception of the last file, (deleted_rows_count) which is purely informative, the other four files contain data which are going to be used in the analysis. The User now has to select one by one these output files and upload them into "CaseDim" application, by clicking on the "Actions" , then "Use in Simple Component..." and finally "CaseDim" tabs as shown in Figure 8: