Jim's observation seems to be generally similar on other HPC clusters in other countries. A lot of scientific software, as I can confirm especially in numerica

Jim's observation seems to be generally similar on other HPC clusters in other countries. A lot of scientific software, as I can confirm especially in numerical fluid dynamics, is written in FORTRAN or at least uses some libraries written in FORTRAN. The basis of numerical computing in form of the BLAS/LAPACK libraries is written in FORTRAN and has had a huge impact on everything in this part of computing. If I am not mistaken even the python libraries depend on BLAS/LAPACK, although they might be using implementations written in C or the like. Nevertheless, FORTRAN is still the work horse in a lot of computational scientific disciplines and should not be disregarded as being dead.