[CIG-ALL] Relax 1.0.1 release

[Sylvain Barbot]

Greetings,

I am pleased to announce the 1.0.1 release of Relax, a Fourier-domain
code to simulate quasi-static deformation relevant to short-term
tectonics. This new version of Relax will be presented in detail at
the CIG 2012 Workshop on Crustal Deformation Modeling.

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 the earthquake-cycle modeling include: i)
co-seismic displacement and Coulomb stress calculations, ii)
quasi-static stress transfer between earthquakes due to a 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 for the binary package are in the
User Manual. Detailed building instructions for a few platforms are
available with the source in the INSTALL file.

RELEASE NOTES:

 * The new version contains an extensive data base of published
coseismic slip distributions and their applications for postseismic
studies, including the 1999 Mw 7.6 Chi-Chi (Johnson et al. 2001), the
1964 Mw 9.2 Alaska (Johnson et al. 1996), the 1992 Mw 7.3 Landers
(Fialko 2004), 1999 Mw 7.1 Hector Mine (Simons et al. 2002), the 2012
Canterbury (New Zealand) (Elliott et al. 2012), the 2004 Mw 6.0
Parkfield (Bruhat et al. 2011), the 2001 Mw 7.8 Kokoxili (Tibet)
(Lasserre et al. 2005, Ryder et al. 2011), the 2010 Mw 6.8 Yushu
(Tibet) (Li et al. 2011), the 2008 Mw 7.1 Yutian (Tibet) (Elliott et
al. 2010) earthquakes, organized by geography. The database offers
realistic examples for strike-slip, normal and reverse faulting
environments.

* I added an option to use Okada (1992) formulation to compute the
effect of select small patches in the coseismic slip distribution.
This allow for a much slower, but more accurate modeling of the stress
perturbation in the near-field in some cases.

* The time-dependent afterslip distribution is output in the Paraview
format for easier visualization (GMT was  and is still also
available).

* This release offers greater performance and the compatibility with
GNU compilers on many types of machines is improved.

* Improved post-processing tools for visualization, map creation and
data manipulation.


I warmly thank Walter Landry for his efforts in making Relax more
broadly available and the many investigators who shared their
published slip distribution models.

Best wishes,

Sylvain Barbot