OpenQuake 0.1 Risk Probabilistic_Event_Based_Risk_Assessment

The GEM Risk calculator is intended to compute probabilistic event based assessment: using set of ground motion fields (generated through stochastic event set) the risk engine is capable of computing losses per asset and/or the aggregated loss since in this approach it is possible to take into consideration the spatial correlation of the ground motion.

Notes

• Assumptions

  • The required Hazard output component is in place.
  • A nrml schema and respective parser for the vulnerability functions and exposure portfolio exist.

• Design The risk engine starts by computing the losses for each ground motion field, and builds a cumulative histogram for each location. From this point, a loss curve can be computed for each location, or the cumulative histograms can be summed into an aggregated histogram to calculated an aggregated loss curve.

• User stories:

  • Port risk engine to Python - Framework.
  • Port risk engine to Python - Loss Curve Calculations.
  • Calculate PO from PE for loss and loss ratio curves.
  • Compute mean loss ratios using one ground motion field.
  • Compute cumulative histogram based on a set of loss ratios for each location.
  • Compute the exceedance rate of a set of loss ratios given a set of cumulative histograms.
  • Compute the loss ratio and loss curve against a set of exceedance rates.
  • Aggregate a set of cumulative histograms.
  • Add CLI flags for probabilistic event-based risk calculation.
  • Compute mean loss / loss ratio map in probabilistic assessment.

• Suggested Implementation

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