USER_GUIDE_TDSH(selected area)

The only data required for Time Dependent Seismic Hazard (TDSH - selected area mode), application is a catalog containing seismic events ('_catalog.mat' is appended in the filenames contain such catalogs). The User goes to his/hers personal workspace and clicks on a seismic events catalog, that is already uploaded (see section ..... eg data handling). For using a selected catalog for TDSH, the User shall click on the "Actions" tab and then select consecutively, "USE IN APPLICATION" and "Hazard in selected area", as shown in figure 1.

Figure 1.

Once the service has been selected the User is requested to select options and fulfill some fields with parameter values needed for the TDSH analysis (see the following figures). These parameters are:

Using seismic catalog: A catalog has been already uploaded since the previous step, however, the User has the chance to select a different dataset, either from another episode or the any dataset after performing some processing/ filtering.

Select Magnitude column: The user may click on the small arrow in the respective tab in order to chose among different magnitude scales, in the cases where they are available (e.g. ML, Mw, etc).

Select Area: This is an interactive option providing to the User the possibility to select data, spatially constrained by a predefined shape (numbers 1-5 in figure 2):

1) No draw option.

2) Draw a polygon.The User may select data into a polygon drawn after clicking in different points of the map. To close the polygon, the User has to double click on the last point, such that this point will be connected with the first one.

3) Draw a rectangle. To select data into a rectangular the User has to click at a point on the map and move the cursor at any direction. A second left mouse button click will restrict the selected area in its current state

4) Draw a circle (option demonstrated in figure 2). To select data into a circular the User has to click at a point on the map and move the cursor at any direction. A second left mouse button click will restrict the selected area in its current state. Note that the first click on the map corresponds to the circle's center.

5) Select all data. All available data included in the uploaded dataset is used for TDSH analysis

Figure 2.

The magnitude range (minimum and maximum magnitude assigned in the catalog) is shown in the screen (M range, Figure 3) for informative purposes.

Mmin: The User now is requested to chose the minimum magnitude (completeness level of the catalog). This can be done in two ways. The first is to type a single magnitude value in the empty box, possibly after he/she has performed an individual analysis (see MCE service). The second is to graphically select the minimum magnitude from the Normal or the Cumulative histograms, which are available after clicking on the respective tabs. In both cases there is option to alter the step of the histogram's bars and to select between linear and logarithmic Y-axis for the plotting.

Time range: The user may further filter the selected dataset by defining the starting and ending data of the period that he/she wishes to study. A calendar appears on the screen after clicking in the empty boxes next to "Start" and "End" fields (Figure 3). Note that this selection is optional. If no dates are entered, the entire dataset remains for the analysis. 

Time unit: There are 3 options for this parameter, which are shown after clicking on the small arrow in the box: Day, Month, Year. The time unit will be stored and all the calculations hereinafter will be performed according to this unit.

Magnitude distribution estimation method: Four different methods are available in the IS-EPOS platform: The Unbounded Gutenberg-Richter, the Upper-bounded Gutenberg-Richter, the unbounded non-parametric and the Upper-bounded non parametric estimations. To select one of the aforementioned methods of analysis, the User has to click on the arrow in the respective box.

Time window step (days): In this field the User selects the time window step, i.e. the number of days between the starting dates of subsequent datasets (see figure 4 for details).

Magnitude: Magnitude for which the TDSH parameters will be calculated.

Time window size: Size (span) of the windows containing data for the analysis (see below for details).

Method of creating windows: Two options are available at this field after clicking on the small arrow of the tab: "TIME" and "EVENTS".

Figure 3.