Step by Step
- The user is now requested to fill the fields shown on Figure 1:
- Use Seismic catalog: The user may click on "change file" button in orde=
r to use a seismic catalog data among the ones that are already uploaded in=
his/hers personal workspace. The program uses the events origin time vecto=
r and automatically calculates the inter-event times (after the appropriate=
catalog filtering as follows below).
- Select Magnitude column - The user may click on the small arro=
w in the respective tab in order to chose among different magnitude scales,=
in the cases where they are available (e.g. ML, Mw, etc).
- Mmin range - The User now is requested to chose the mini=
mum 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, possi=
bly after he/she has performed an individual analysis (see MCE service). Th=
e second is to graphically select the minimum magnitude from the Normal or =
the Cumulative histograms, which are available after clicking on the respec=
tive tabs. In both cases there is option to alter the step of the histogram=
's bars and to choose between linear and logarithmic scale of the Y-axis fo=
r 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 t=
o study. A calendar appears on the screen after clicking in the empty boxes=
next to "Start" and "End" fields. Alternatively, the User may graphically =
select a time window, after clicking on 'Seismic Activity Plot' tab. A cumu=
lative count of events plotted against time appears and the User can click =
on certain points of this plot to define the starting and ending time of th=
e time period of interest (Figure 2). Note that this selection is optional.=
If no dates are entered, the entire dataset remains for the analysis.
- Significance level - The User is requested to enter the signif=
icance level, a, for the null hypothesis rejection (0<a<1)
- Distribution - he user may click on the small arrow in the res=
pective tab in order to chose between 'exponential' and 'weibull' distribut=
ion
- Monte Carlo Trials - number of Monte Carlo Trials for distribu=
tion parameters confidence Intervals evaluation. Should be an integer in th=
e range [100-50,000]
Figure 1. Input window of Inter-e=
vent Time Distribution Analysis.
Figure 2 Seismic activity with ti=
me plot.
2. After defining the aforementioned parameters, the user shall click on th=
e
button (Figure 1) and the calculati=
ons are performed. The output is soon to be created.
The output results include:
- A matlab output file ('stattest_output.mat' - Figure 3) with parameters=
are displayed on the screen and can be downloaded or used for visualizatio=
n (click on 'SHOW' tab, Figure 3)
- An ascii report file ('report.txt' - Figure 3) which includes all a sum=
mary of input/output data and can be downloaded.
- A plot ('plout_output.mat' Figure 3) of the inter-event time distributi=
on, the best fit curve, and its 2.5 and 97.5 confidence bounds (Figure 4)=
li>
Figure 3. Results of the Inter-ev=
ent Time. Distribution Analysis.
Figure 4. Cumulative Distribution=
function of the Inter-event Time.
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