Dear Nikos,
Indeed, to export a hazard map you choose a exceedance probability in a time frame (e.g. 50 years) and automatically R-CRISIS calculates the return period associated to those values. However, some users are interested in getting the .map output file, which contains uniform hazard spectra for selected hazard levels. In this way, you will obtain a file in which the UHS, for each return period defined, will be contained.
Remember, to obtain this file you have to check the .map option in Input -> Set output files (optional).
Thank you for your preference and interest in R-CRISIS.
Best regards,
