There is no "standard" compiler. There is a Fortran standard, and there are standard-conforming compilers and standard-conforming programs.

There are popular compilers, like gfortran and the Intel compiler.

My point had nothing to do with popularity. My point is that non-standard-conforming programs can have anything happen when they execute, including starting World War III (see https://www.google.com/search?q=fortran+"start+world+war"), and showing output from one compiler doesn't prove anything.

> What is the "standard" fortran compiler for scientific computing?

Not so long ago, supercomputers typically had Portland Group, Cray and Pathscale compilers installed. Nowadays it's pretty much Intel and gfortran.