EXSIM12: A stochastic finite - fault computer program in FORTRAN original downloaded from http://www.seismotoolbox.ca/EXSIM12, as modified by Karen Assatourians and Gail Atkinson, May 2012. The source has been modified in order to be compiled under linux UBUNTU server using an intel X64 compiler (February 2015) The modified source and the compiled executable can be freely downloaded from this repository.