TRIGRS v2.1

We have parallelized the four time-demanding execution modes of TRIGRS, namely both the saturated and unsaturated model with finite and infnite soil depth options, within the Message Passing Interface framework. In addition to new features of the code, we outline details of the parallel implementation and show the performance gain with respect to the serial code. Results are obtained both on commercial hardware and on a high-performance multi-node machine, showing the different limits of applicability of the new code.