# SHaxi

SHaxi performs elastic and anelastic global SH wave propagation in the Earth's mantle for axi-symmetric geometries.

Authors: | Gunnar Jahnke, Mike Thorne, Heiner Igel |
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General: | Wave propagation |

Code level: | Research |

Language: | Fortran 90/95 or later |

Associated groups: | Numerical Methods |

Supercomputing: | Distributed Memory (e.g., MPI) |

Grid dimensions: | 2.5D |

Coordinate system: | Spherical |

Method: | Finite differences |

Rheology: | Acoustic scalar (SH) |

Solution type: | Numerical |

Total hits: | 8465 |

## Project Description

The**SHaxi**program generates global high resolution

**SH wave**seismograms and wavefield snapshots using high performance parallel computers or PC networks.

The algorithm is based on

*finite difference*operators and

*staggered grids*. For use on high performance parallel computers with distributed memory architecture or on PC clusters a domain decomposition of the model space was implemented, using

*Fortran 90*and

*MPI*.

Possible models are restricted to

*axi-symmetric geometries*which allows the computation of synthetic seismograms at dominant periods down to 2.5 seconds for global mantle models.

The code is

*verified*against an

*analytical solution*and the implemented ring-source is well understood. Appropriate routines for convenient definition of user-defined models are implemented and explained.

The SHaxi method has already proven to be a valuable method for computing global synthetic seismograms at high frequencies and for studying the seismic waveform effects from models where

*rotational symmetry*may be assumed.

The code can be downloaded from: svn.geophysik.uni-muenchen.de/trac/shaxi

Detailed information abut the method can be found in

*Jahnke et al. (2008)*as well as in the PhD thesis of Gunnar Jahnke.