Verification/Validation of scientific outputs of Cybershake:

There are three levels of verification/validation applied to the outputs from Cybershake.

I) Rupture realization Level

1-    calculate and plot simulation epsilon for the first run of a fault. Simulation epsilon is (one realization im) – (empirical median) / (empirical sigma). We need two plots for this calculation:

a) a map plot of ratio

b) histogram

note: we will decide on the pass-or-fail threshold to stop the simulation if they are too off.

II) Fault level

1-    Calculated and plot these when all realizations of a given fault are finished running:

a) (Simulation median) / (Empirical median) plotted on a map for a given fault; and its histogram

b) (Simulation sigma) / (Empirical sigma) plotted on a map for a given fault;  and its histogram

III) Hazard

  1. Generate hazard map from cybershake and empirical at N_haz hazard levels for N_im IM levels,
    e.g., 10% and 2% in 50 years hazard for PGA, PGV, SA(0.5,1.0,5.0,7.5).

  2. Generate map plot of (sim/emp) hazard ratio

  3. Histogram of ratios (which shows at what proportion of the non-uniform sites (which implicitly represent the spatial applicability of the CS results) we have over- or under-prediction)

  4. Generate hazard curves for the default list of sites (e.g., 12 major populated regions) automatically, using an extendable code that can do this for N_{site} user-specified site.

  5. Generate deagg for the N_{site} selected sites above, at N_haz hazard levels

  6. Plot the contribution of tectonic types of sources based on map. This requires conducting de-agg for all sites at a user-specified hazard level

 

Note: The minimal list of IMs considered for CS18.6 version is: PGA, PGV, SA(0.5, 1.0,3.0,5.0), Ds595, Ds575, CAV, AI

Here is the planning sketch from the discussion with the software developer group:

 

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