faq-hazard.md

FAQ about running hazard calculations

How do I export the hazard curves/maps/uhs for each realization?

By default the engine only exports statistical results, i.e. the mean hazard curves/maps/uhs. If you want the individual results you must set individual_curves=true in the job.ini files. Please take care: if you have thousands of realizations (which is quite common) the data transfer and disk space requirements will be thousands of times larger than just returning the mean results: the calculation might fail. This is why by default individual_curves is false.

Argh, I forgot to set individual_curves! Must I repeat the calculation?

No, just set individual_curves=true in the job.ini and run

$ oq engine --run job.ini --reuse-hazard --exports csv

The individual outputs will be regenerated by reusing the result of the previous calculation: it will be a lot faster than repeating the calculation from scratch.

Argh, I set the wrong poes in the job.ini? Must I repeat the calculation?

No, set the right poes in the job.ini and as before run

$ oq engine --run job.ini --reuse-hazard --exports csv

Hazard maps and UHS can be regenerated from an existing calculation quite efficiently.