diff --git a/specfem3d/env/env_marconi100 b/specfem3d/env/env_marconi100
new file mode 100644
index 0000000000000000000000000000000000000000..4322d8449063269a070af5923c598579c130b361
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+++ b/specfem3d/env/env_marconi100
@@ -0,0 +1,19 @@
+#!/bin/bash
+module purge
+module load profile/base
+module load xl/16.1.1--binary spectrum_mpi/10.3.1--binary cuda/11.0
+
+export machine=marconi100
+export software=specfem3d_globe
+export version=31octobre
+export install_dir=$CINECA_SCRATCH/benchmarks/$machine/$software/$version
+
+# Power9
+export CC="mpixlc"
+export FC="mpixlf"
+export MPIFC=mpixlf
+#DEBUG="-qcheck -g -qsigtrap" # -qstackprotect=all -> internal compiler error : https://www.ibm.com/support/pages/node/722473
+#FLAGS_CHECK="-g -qfullpath -O2 -qsave -qstrict -qtune=qp -qarch=qp -qcache=auto -qhalt=w -qfree=f90 -qsuffix=f=f90 -qlanglvl=95pure -Q -Q+rank,swap_all -Wl,-relax"
+#FLAGS_CHECK="-g -qfullpath -qsave -qtune=auto -qarch=auto -qcache=auto -qhalt=w -qfree=f90 -qsuffix=f=f90 -qlanglvl=2003pure"
+export FCFLAGS="-O3 -DUSE_FP32 -DOPT_STREAMS -qpic $FLAGS_CHECK $DEBUG" #-mcmodel=large -qoffload
+export CFLAGS="-O3 -qpic $FLAGS_CHECK $DEBUG" #-qoffload