Hazard

**Hazard Main Component **

• Earthquake Rupture Forecast Calculator – According to what has been developed during GEM1, the current version of this calculator creates ERFs using four standard seismic source typologies (each one described by a well defined set of parameters);
• Classical PSHA Calculator – This calculator essentially inherits the OpenSHA HazardCurveCalculator. It computes hazard curves at a specified site given an ERF, a GMPE, a Time Span and a parameter representing the intensity of the motion.\
• Stochastic Event Set Calculator – Using an ERF creates one or several groups of ruptures each one representing a possible realization of the seismicity generated in a given time span by the entire set of seismic sources included in the seismic source data model (sampling performed using the inverse transform method).
• Ground Motion Field Calculator - The ground motion field calculator, given a single earthquake rupture, computes values of a scalar parameter - descriptive of ground motion intensity (e.g. Peak Ground Acceleration) - for a set of sites.
• Stochastic PSHA Calculator - The stochastic PSHA calculator computes PSHA results (i.e. hazard curves) by processing the ground motion fields created from a stochastic event set (i.e. a set of seismicity realizations). Each seismicity realization contained in the stochastic event set represents a possible set of ruptures produced by the entire set of seismic sources during the time span considered for the analysis. This calculator is implemented but not fully supported (e.g. it cannot be used through the CLI).

Main (hazard) results typologies

• Hazard curves
• Hazard maps
• Uniform hazard spectra
• Stochastic Event Set (intermediate product)
• Set of Ground Motion Fields
• Magnitude-Distance-epsilon and geographic disaggregation
• Logic Tree sensitivity analysis

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