Extreme Scale Multi-Physics Simulations of the Tsunamigenic 2004 Sumatra Megathrust Earthquake

We present a high-resolution simulation of the 2004 Sumatra-Andaman earthquake, including non-linear frictional failure on a megathrust-splay fault system. Our method exploits unstructured meshes capturing the complicated geometries in subduction zones that are crucial to understand large earthquakes and tsunami generation. These up-to-date largest and longest dynamic rupture simulations enable analysis of dynamic source e ects on the sea oor displacements. To tackle the extreme size of this scenario an end-to-end optimization of the simulation code SeisSol was necessary. We implemented a new cache-aware wave propagation scheme and optimized the dynamic rupture kernels using code generation. We established a novel clustered local-time-stepping scheme for dynamic rupture. In total, we achieved a speed-up of 13.6 compared to the previous implementation. For the Sumatra scenario with 221 million elements this reduced the time-to-solution to 13.9 hours on 86,016 Haswell cores. Furthermore, we used asynchronous output to overlap I/O and compute time.

@article{id2309,
  author = {Uphoff, Carsten and Rettenberger, Sebastian and Bader, Michael  and Madden, Elizabeth H. and Ulrich, Thomas and Wollherr, Stephanie   and Gabriel, Alice-Agnes},
  doi = {10.1145/3126908.3126948},
  journal = {Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis SC17},
  language = {en},
  title = {Extreme Scale Multi-Physics Simulations of the Tsunamigenic 2004 Sumatra Megathrust Earthquake},
  year = {2017},
}

%O Journal Article
%A Uphoff, Carsten
%A Rettenberger, Sebastian
%A Bader, Michael 
%A Madden, Elizabeth H.
%A Ulrich, Thomas
%A Wollherr, Stephanie  
%A Gabriel, Alice-Agnes
%R 10.1145/3126908.3126948
%J Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis SC17
%G en
%T Extreme Scale Multi-Physics Simulations of the Tsunamigenic 2004 Sumatra Megathrust Earthquake
%D 2017