Shakemaps failing when crossing the international date line (IDL)
When an event occurs close to the international dateline (180˚E/˚W) the target site model and resulting shakemap cannot be built.
There are several steps to solving this problem:
OpenQuake site models require longitudes in the range -180˚E to 180˚E, so permit bounding boxes to generate limits beyond -180˚E and 180˚E in order to generate the site models, but then translate sites in the range long < -180˚E and > 180˚E accordingly. This would make it possible to calculate the ground motions for the sites.
For exporting to raster there are two options: i) Split the raster into two different rasters (one either side of the IDL), ii) translate the sites back so that longitudes can be outside of the -180˚E to 180˚E band and retain the simple bounding box shape.