[CIG-SHORT] Relax 1.0.4 release

[Sylvain Barbot]

Greetings,

I am pleased to announce the 1.0.4 release of Relax, a Fourier-domain
code to simulate quasi-static deformation relevant to short-term
tectonics. A recent application of the method for the 1999 Chi-Chi
earthquake can be found in the work of Rousset et al. (2012).

Relax can be used to evaluate the displacement and stress in a half
space with gravity due to Okada-type dislocations, Mogi sources, and
surface tractions; and the nonlinear time-dependent deformation that
follows due to power-law rheology materials in the bulk and/or
rate-strengthening friction faults. The numerical method is based on a
Fourier-domain elastic Green's function (Barbot & Fialko, 2010a;
2010b) and an equivalent body-force representation of co-seismic and
post-seismic deformation processes (Barbot et al., 2009b).

The applications for short-term tectonics modeling include: i)
co-seismic displacement and Coulomb stress calculations, ii)
quasi-static stress transfer between earthquakes due to postseismic
transient, iii) modeling of postseismic transients including lateral
variations of rheological properties, nonlinear constitutive laws and
multiple mechanisms, iv) cycle of multiple earthquakes and spin-up
models, v) loading cycle of lakes, dams or the monsoon.

DOWNLOAD:

You can download the source code and binaries at:

http://geodynamics.org/cig/software/relax

Detailed installation instructions are in the User Manual.

UPGRADE:

For those who installed from source using mercurial, you can obtain
the new release with the commands:

hg pull --update

then re-build the executable with

./waf

RELEASE NOTES:

* The database of slip distributions now includes the Manyi, Sichuan,
Nias, and Aceh earthquakes.

* Simplify output for realistic viscoelastic structures of the Moho or
the asthenosphere.

* Improve and augment post-processing scripts (grdmap.sh, xyz2vtk.sh,
seg2flt.py, grd2vtk.sh, obsres.py).

* Improve compatibility with Linux environment.

* Improve documentation, including a man page.

* Fix problems with Fortran's zero initialization.

* Fix minor bugs with the waf installation script.

I thank Walter Landry for his continued help with maintaining and
improving the Relax package.

Best wishes,
Sylvain Barbot

--
Sylvain Barbot, Asst. Prof.
Earth Observatory of Singapore
+65 6592 3195