Place: Online
Date: 19-21 October 2021
Time: 9:00-17:00 CEST
Description
Are you interested in numerical wave simulations but feel like there are too many codes and methods out there and don’t know which option is right for you? Or perhaps you just want to refresh your knowledge and gain some practical experience with the different possibilities? Either way, this fully virtual workshop is for you!
During three full days on 19-21 October 2021, you will receive introductory hands-on tutorials for ExaHyPE, Salvus, SeisSol, and SPECFEM3D, which are four different high-performance computational seismology software packages focused on waveform modeling and inversion. The workshop will provide you with an overview of their similarities, differences, and areas of applicability. Unique and in-depth half-day practicals will be provided for each package, with computational resources provided by HLRS. Participants will also be encouraged to present their own work and/or motivation as a one-minute lightning-talk during the wrap-up session of the workshop.
This training event is hosted by ChEESE, the Center of Excellence for Exascale in Solid Earth and supported by the ENERXICO project.
The organisers look forward to seeing you in October!
Target Audience
Researchers and students of all levels interested in augmenting their science with numerical waveform and dynamic rupture simulations as well as full-waveform inversion.
Learning outcomes
- A basic introduction to waveform physics modeling
- Hands-on experience with four different wave propagation codes
Prerequisites
- Basic knowledge of computational seismology (e.g., familiarity with the elastic wave equation)
- Basic knowledge of Python and Jupyter notebooks
- Optional: basic programming skills (C/C++, only for the ExaHyPE course module)
Course lecturers
SPECFEM3D - Vadim Monteiller (CNRS), Amandine Sergeant (CNRS), Masaru Nagaso (CNRS)
SeisSol - Alice-Agnes Gabriel (LMU Munich), Duo Li (LMU Munich) , Thomas Ulrich (LMU Munich), Bo Li (LMU Munich), Carsten Uphoff (LMU), Sebastian Wolf (TUM), Sara Aniko Wirp (TUM)
Salvus - Lion Krischer (Mondaic AG), Michael Afanasiev (Mondaic AG), Christian Bohm (Mondaic AG)
ExaHyPE - Leonhard Rannabauer (TUM), Anne Reinarz (Durham University), Lukas Krenz (TUM), Philipp Samfaß (TUM), Mario Wille (TUM)
Course organisers
Jose Gracia (HLRS), Rose Gregorio (BSC)
Local organisers
Rolf Rabenseifner (HLRS) , Lucienne Dettki (HLRS), Lorenzo Zanon (HLRS), Varadarajan Parthasarathy (HLRS) and Christoph Niethammer (HLRS)
Agenda
Day 1: 19 October 2021
09:00-09:30 Introduction to the course
09:30-10:30 Introduction to ExaHyPE & SeisSol
10:30-11:00 Break
11:00-12:00 Introduction to SPECFEM3D & Salvus
12:00-13:00 Lunch break
13:00-13:30 Lightning talks
13:30-16:30 SeisSol code
Day 2: 20 October 2021
09:00-12:00 ExaHyPE code
12:00-13:00 Lunch break
13:00-13:30 Lightning talks
13:30-16:30 SPECFEM3D code
Day 3: 21 October 2021
09:00-12:00 Salvus code
12:00-13:00 Break
13:00-13:30 Lightning talks
13:30-14:00 Wrap up
14:00-16:00 Q&A with the instructors
About the codes
ExaHyPE (“An Exascale Hyperbolic PDE Engine” www.exahype.org ) is a software engine for solving systems of first-order hyperbolic partial differential equations. As an “engine”, ExaHyPE provides well-defined numerical schemes (high-order discontinuous Galerkin) on a fixed mesh infrastructure, but lets users formulate the specific PDE. In this course you will learn how to do so by implementing the acoustic wave equation within ExaHyPE. We will also provide an outlook to more complicated seismic modeling based on ExaHyPE.
SeisSol (www.seissol.org ) is a software package for simulating wave propagation and dynamic earthquake rupture based on the arbitrary high-order accurate derivative discontinuous Galerkin method (ADER-DG). SeisSol employs fully adaptive, unstructured tetrahedral meshes to combine geometrically complex 3D geological structures with nonlinear rheologies and frictional failure across fault systems.
SPECFEM3D The software package SPECFEM3D (https://github.com/geodynamics/specfem3d) simulates seismic wave propagation at the local or regional scale and performs full-waveform inversion or adjoint tomography-based upon the spectral-element method. It can, for instance, model seismic waves propagating in sedimentary basins or any other regional geological model following earthquakes. SPECFEM3D simulates wave propagation for acoustic (fluid), visco-elastic (solid), coupled acoustic/visco-elastic models in any type of conforming mesh of hexahedra (structured or not). In this course, you will learn how to set up with SPECFEM3D different kinds of simulations relevant in seismology (eg: Basin, subduction zone, volcano, etc.). You will learn how to use the internal mesher MESHFEM3D and how to perform forward modeling. We will also give an overview of the inversion capabilities of the SPECFEM3D package (gradient or sensitivity kernels based on adjoint computation, full waveform inversion).
Salvus (http://salvus.io) is a high-performance and scalable software package that solves full-waveform forward and inverse problems using the spectral-element method in both two and three dimensions. In this course we will give an interactive overview of the full-waveform inversion (FWI) process, including data processing, adjoint-source generation, gradient computation, workflow management, and nonlinear model updates. At the conclusion of the session, participants should have the knowledge required to set up and solve realistic FWI problems of their own.
Fees
This course is free to all participants.
Lightning talks
All participants will be invited to record a 2-minute maximum lightning talk to introduce themselves and their work.
Registration
There are still free slots in the course.
We use the waiting list for priority selection. Based on the project goals, we first accept EU13 participants until September 2 (highest priority).
After September 2, we will accept other participants (EU and others) as well, if there are still slots available. Registration will close on September 17.
Therefore, please register on our waiting list.
Please be aware that this training event will be recorded and uploaded to the ChEESE website and affiliated social media channels.
If you agree with that, you can register via the online registration form.
Learn more: https://www.hlrs.de/training/2021/CHEESE
