SEM2DPACK / News: Recent posts

SEM2DPACK version 2.3.8 released

SEM2DPACK is a spectral element method solver for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

A new version of SEM2DPACK (2.3.8) is now available for download at http://sourceforge.net/projects/sem2d

This version can read mesh files exported by the mesh generation programs CUBIT and EZ4U, and introduces kinematic fault sources, heterogeneous coefficients for anistropic media, absorbing boundaries with arbitrary orientation, Gaussian source time function and pre-processing utilities to compute critical time steps. Bugs are fixed in time-weakening friction and handling of fault tip nodes of single-sided faults. ... read more

Posted by Jean-Paul Ampuero 2012-08-07

SEM2DPACK version 2.3.7 released

SEM2DPACK is a spectral element method solver for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

A new version of SEM2DPACK (2.3.7) is now available for download at http://sourceforge.net/projects/sem2d

This version introduces the following features for dynamic faults: more stable curved elements for non-planar faults with smooth normal, cohesion in fault strength, more options in time-weakening fronts for rupture nucleation, enabled time-weakening in combination with rate-and-state-dependent friction, easier setting of fault zone viscosity layer. In addition, the flexibility of the matlab mesh generation tools was enhanced.... read more

Posted by Jean-Paul Ampuero 2012-08-03

SEM2DPACK version 2.3.6 released

SEM2DPACK is a spectral element method solver for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

A new version of SEM2DPACK (2.3.6) is now available for download at http://sourceforge.net/projects/sem2d

This version introduces useful features for dynamic faults: smooth mesh generation for fault surfaces, instantaneous healing in slip-weakening friction, optional suppression of fault opening, easy tagging of near-fault elements, separate output of initial values and cohesive normal response. Bugs in the plastic solver are fixed.... read more

Posted by Jean-Paul Ampuero 2009-09-01

SEM2DPACK version 2.3.5 released

SEM2DPACK is a spectral element method solver for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

A new version of SEM2DPACK (2.3.4) is available for download from SourceForge.net at:
http://sourceforge.net/project/showfiles.php?group_id=182742

The main features of this version include more capabilities for structured and semi-structured meshing, stress glut and seismic potency outputs for dynamic sources and new mesh visualization and snapshot animation tools.... read more

Posted by Jean-Paul Ampuero 2009-02-16

SEM2DPACK version 2.3.4 released

SEM2DPACK is a spectral element method solver for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

A new version of SEM2DPACK (2.3.4) is available for download from SourceForge.net:
http://sourceforge.net/project/showfiles.php?group_id=182742

This version features new outputs (energies, curl, div, values at each fault side), new post-processing tools (response spectra, Arias intensity, significant duration, extract values on points and lines) and Brune's source time functions.... read more

Posted by Jean-Paul Ampuero 2008-11-27

SEM2DPACK version 2.3.3 released

SEM2DPACK is a spectral element method solver for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

A new version of SEM2DPACK (2.3.3) is available for download from SourceForge.net:
http://sourceforge.net/project/showfiles.php?group_id=182742

This version introduces a Maxwell-viscous regularization for plasticity and structured meshing of non-planar faults. Minor bug fixes are reflected by changes in the input syntax for time integration (Newmark/HHT), receiver locations and linear distributions.... read more

Posted by Jean-Paul Ampuero 2008-08-06

SEM2DPACK version 2.3.2 released

SEM2DPACK is a spectral element method solver for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

A new version of SEM2DPACK (2.3.1) is available for download from SourceForge.net:
http://sourceforge.net/project/showfiles.php?group_id=182742

This version introduces a velocity and state dependent friction law for dynamic faults, with fast velocity-weakening at high slip rates.... read more

Posted by Jean-Paul Ampuero 2008-05-16

SEM2DPACK version 2.3.1 released

SEM2DPACK is a spectral element method solver for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

A new version of SEM2DPACK (2.3.1) is available for download from SourceForge.net:
http://sourceforge.net/project/showfiles.php?group_id=182742

This version includes time-weakening friction for prescribed rupture speed simulations. Parts of the code have been refactored to reduce memory overhead and to improve encapsulation. The CPU time and memory usage estimates have been improved.... read more

Posted by Jean-Paul Ampuero 2008-04-09

SEM2DPACK version 2.3.0 released

SEM2DPACK is a spectral element method solver for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

You can download the new version 2.3.0 of SEM2DPACK from SourceForge.net by following this link:
http://sourceforge.net/project/showfiles.php?group_id=182742

The main new features are (1) non-linear constitutive equations (continuum damage and Coulomb plasticity), (2) regularization for bimaterial faults, (3) linear slip faults for SH, (4) improved utilities for plotting and manipulating outputs, including a GUI.... read more

Posted by Jean-Paul Ampuero 2008-03-06

SEM2DPACK version 2.2.11 released

SEM2DPACK is a spectral element method for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

You can download the new version 2.2.11 of SEM2DPACK from SourceForge.net by following this link:
http://sourceforge.net/project/showfiles.php?group_id=182742&release_id=484922

The main new features are (1) double couple and seismic moment sources, possibly located at interelement nodes, (2) plane wave sources with oblique incidence and (3) source time functions interpolated from a user supplied file. ... read more

Posted by Jean-Paul Ampuero 2007-06-06

SEM2DPACK version 2.2.10 released

SEM2DPACK is a spectral element method for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

You can download the new version 2.2.10 of SEM2DPACK from SourceForge.net by following this link:
http://sourceforge.net/project/showfiles.php?group_id=182742&release_id=484922

The main new features are (1) built-in mesh generation for layered media with surface and sub-surface topography and (2) more Matlab scripts for data manipulation and visualization.... read more

Posted by Jean-Paul Ampuero 2007-05-31

SEM2DPACK version 2.2.9 released

SEM2DPACK is a spectral element method for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

You can download the new version 2.2.9 of SEM2DPACK from SourceForge.net by following this link:
http://sourceforge.net/project/showfiles.php?group_id=182742&release_id=484922

The main new features are (1) a template for user-supplied source time function and (2) an example with comparison to an analytical solution (Lamb's problem).... read more

Posted by Jean-Paul Ampuero 2007-04-04

SEM2DPACK version 2.2.8 released

SEM2DPACK is a spectral element method for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

You can download the new version 2.2.8 of SEM2DPACK from SourceForge.net by following this link:
http://sourceforge.net/project/showfiles.php?group_id=182742&release_id=484922

The new features are (1) receivers at arbitrary positions and (2) multiple sources with time delay.... read more

Posted by Jean-Paul Ampuero 2007-03-12

SEM2DPACK version 2.2.7 released

SEM2DPACK is a spectral element method for 2D wave propagation and fracture dynamics, with emphasis on computational seismology and earthquake source dynamics.

You can download the new version SEM2DPACK 2.2.7 from SourceForge.net by following this link:
http://sourceforge.net/project/showfiles.php?group_id=182742&release_id=484922

The main new feature is the handling of heterogeneous medium properties through DIST_XXXX blocks. A new DIST_HETE1 block allows to interpolate linearly properties defined on a regular grid. See an example in EXAMPLES/InaBox, and the discussion of the Feature Request ID 1631862 at
http://sourceforge.net/tracker/index.php?func=detail&aid=1631862&group_id=182742&atid=902439... read more

Posted by Jean-Paul Ampuero 2007-02-08

SEM2DPACK 2.2.6 released

Only minor changes, in the mesh quality view script and in the 1D fault example.
Thanks to the H. Gao, F. Gallovic for their feedback.

J.P. Ampuero
Research Associate
ETH Zurich -- Institute of Geophysics
http://www.sg.geophys.ethz.ch/geodynamics/ampuero/

Posted by Jean-Paul Ampuero 2007-01-18

SEM2DPACK 2.2.5 released, now hosted in SourceForge

SEM2DPACK is a simulator of 2D elastic wave propagation and fracture dynamics. It applies the Spectral Element Method (SEM), a method similar to mass-lumped high-order finite elements. Flexibility and accuracy are the main goals. The emphasis is currently on computational seismology and earthquake source dynamics. SEM2DPACK has already a number of users in the seismology and earthquake engineering communities. However I hope this software can attract a wider audience in computational mechanics, research, and engineering.... read more

Posted by Jean-Paul Ampuero 2006-11-23