Openquake 0.3 hazard disaggregation_calculator

The disaggregation calculator, given:

1. An Earthquake Rupture Forecast Logic Tree
2. A GMPE Logic Tree
3. One site
4. A scalar parameter descriptive of ground motion intensity (i.e. IML) with a specified probability of exceedance in a given time span

computes the contributions to this value of hazard for discrete combinations of basic parameters considered in hazard calculation (e.g. magnitude, rupture-site distance)

The most typical representation of disaggreation results shows contributions to a fixed value of hazard (e.g. PGA with 10% probability of exceedance in 50 years) for different combinations of:

1. Rupture magnitude
2. Rupture-site distance
3. Normalized residual of gm (epsilon).

On the contrary, geographic disaggreation provides contributions for different combinations of:

1. Rupture magnitude
2. Longitude of the point on the rupture used to compute the distance from the site
3. Latitude of the point on the rupture used to compute the distance from the site
4. Normalized residual of gm (epsilon).