Extreme scale multi-physics simulations of the tsunamigenic 2004 sumatra megathrust earthquake

Carsten Uphoff, Sebastian Rettenberger, Michael Bader, Elizabeth H. Madden, Thomas Ulrich, Stephanie Wollherr, Alice Agnes Gabriel

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

66 Scopus citations

Abstract

We presenta 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 effects on the seafloor 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.

Original languageEnglish
Title of host publicationProceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis, SC 2017
PublisherAssociation for Computing Machinery, Inc
ISBN (Electronic)9781450351140
DOIs
StatePublished - 12 Nov 2017
EventInternational Conference for High Performance Computing, Networking, Storage and Analysis, SC 2017 - Denver, United States
Duration: 12 Nov 201717 Nov 2017

Publication series

NameProceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis, SC 2017

Conference

ConferenceInternational Conference for High Performance Computing, Networking, Storage and Analysis, SC 2017
Country/TerritoryUnited States
CityDenver
Period12/11/1717/11/17

Keywords

  • ADER-DG
  • Asynchronous output
  • Dynamic rupture
  • Earthquake simulation
  • Hybrid parallelization
  • Local time stepping
  • Petascale performance
  • Tsunami coupling

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