Scenario Hazard Calculation Using a Simple Fault

[MNA16]

Hi there,

 

Is it possible to do a scenario hazard calculation in OQ using a simple fault that has a range of possible magnitudes all having the same probability of occurrence? I would like to simulate a range of possible magnitudes. Is there a way to include magnitude in the Monte Carlo procedure?

 

I tried the classical option with the fault defined as a characteristic fault with a simple geometry and it worked well. However, what I need is the raw shaking parameters for each realisation.

 

Thanks,

Mostafa

 

 

[Michele Simionato]

This feature currently is not supported in the engine. You could implement it yourself by using hazardlib. In order to do that you have to study the GmfComputer class.

       Michele

[Graeme Weatherill]

Dear Mostafa,

Whilst Michele is right and what you describe is not currently a feature, you might be able to get what you want from the event-based calculator, with some redundancy though. If you use the characteristic fault source (so the geometry is fixed) then you could use an arbitraryMFD option to describe the range of magnitudes and set their associated rates to, say, 1.0., e.g:

<arbitraryMFD>
    <occurRates>1.0 1.0 1.0</occurRates>
    <magnitudes>6.8 7.0 7.2</magnitudes>
</arbitraryMFD>

Running the event-based calculator for an investigation time sufficient to sample well all of the ruptures (say 1000 times the number of magnitudes) should generate a sufficient sampling of ground motion fields from each event, which you can export directly.

Graeme

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[MNA16]

Great, thanks for the reply.