Downloads: Tools and Software

FORTRAN code for calculating synthetic seismograms based on a layered viscoelastic half-space earth model.
Highlights(1) orthonormal propagator algorithm for numerical stability (more efficient than the reflectivity method)
(2) complex frequency technique for supressing the time-domain aliasing problem
(3) wave-number-domain differential filter technique for suppressing numerical phases
(4) various partial solution options
(5) different shallow structures at source and receiver site
(6) earth flattening transformation
Related codesMSEIS – for marine seismic application
Downloadsftp://ftp.gfz-potsdam.de/pub/home/turk/wang/Qseis2D.rar
eferences - Wang, R., (1999), A simple orthonormalization method for stable and efficient computation of Green's functions, Bulletin of the Seismological Society of America, 89(3), 733-741.


- EDGRN/EDCMP
FORTRAN code for calculating co-seismic static deformation based on the dislocation theory.
Highlights(1) incorporating with layered earth structure
(2) incorporating with finite slip models
(3) high numerical efficiency
Downloadsftp://ftp.gfz-potsdam.de/pub/home/turk/wang/edgrn+edcmp-code+input.zip
References - Wang, R., F. Lorenzo-Martín and F. Roth (2003), Computation of deformation induced by earthquakes in a multi-layered elastic crust - FORTRAN programs EDGRN/EDCMP, Computer and Geosciences, 29(2), 195-207.


- PSGRN/PSCMP
FORTRAN code for calculating of co- and post-seismic deformation in multi-layered viscoelastic half-space based on the viscoelastic-gravitational dislocation theory.
Highlights(1) orthonormal propagator algorithm for numerical stability
(2) finite fault model
(3) gravity effect on deformation
(4) output of complete geophysical observables (displacement, stress/strain, tilt, plate rotation, gravity and geoid changes)
Downloadsftp://ftp.gfz-potsdam.de/pub/home/turk/wang/psgrn+pscmp-2008a.zip
References - Wang, R., F. Lorenzo-Martin and F. Roth (2006), PSGRN/PSCMP - a new code for calculating co- and post-seismic deformation, geoid and gravity changes based on the viscoelastic-gravitational dislocation theory, Computers and Geosciences, 32, 527-541. doi:10.1016/j.cageo.2005.08.006


- POEL FORTRAN
code for simulating the diffusion and deformation process induced by pump tests in a layered poroelastic half-space.
Highlights(1) orthonormal propagator algorithm for numerical stability
(2) fully coupled diffusion and deformation system based on Biot’s poroelasticity theory
(3) wave-number-domain differential filter technique for fast convergence of numerical Hankel transform
Related codesPEGRN/PECMP – for co- and post-seismic deformation in multi-layered poroelastic half-space
Downloadsftp://ftp.gfz-potsdam.de/pub/home/turk/wang/update_poel2012-code+input.rar
References - Wang, R., and H.-J. Kümpel (2003), Poroelasticity: Efficient modelling of strongly coupled, slow deformation processes in a multilayered half-space, Geophysics, 68(2), 705-717.


- QSSP FORTRAN
code for calculating complete synthetic seismograms of a spherical earth using the normal mode theory.

Highlights(1) all-in-one code for body waves, surface waves, free oscillations, tsunami for uniform ocean, infrasound waves for a standard atmosphere and static deformation
(2) generating Green’s function database or simulating complete seismograms for any given kinematic source model
(3) hybrid algorithm (numerical integration for low frequency / small harmonic degrees and analytical propagator algorithm for high frequency / large harmonic degrees)
(4) complex frequency technique for supressing the time-domain aliasing problem
(5) differential filter technique for suppressing numerical phases
Downloadsftp://ftp.gfz-potsdam.de/pub/home/turk/wang/qssp2010-code+input.rar
References - Gilbert, F. and Backus, G.: Elastic-gravitational vibrations of a radially stratified sphere, in: Dynamics of Stratified Solids, edited by: Herrmann, G., American Society of Mechanical Engineers, New York, 82–95, 1968. Takeuchi, H., and M. Saito (1972). Seismic surface waves, in Methods in Computational Physics, vol. 11, Bolt, B. A. , Editor Academic Press, New York, 217- 295.
 - Wang, R., (1997), Tidal response of the solid earth, in Tidal Phenomena, edited by H. Wilhelm, W. Zürn and H.G. Wenzel, Lecture Notes in Earth Sciences, Vol. 66, pp. 27-57, Springer-Verlag, Berlin/Heidelberg, Germany, 1997.


 - SDM
FORTRAN code for inverting co-seismic surface deformation data (GPS, InSAR, etc.) for fault slip distribution.
Highlights(1) incorporating with layered crust structure
(2) arbitrarily curved fault geometry
(3) a-priori constraint on the variation range of rake angle
(4) optional smoothing constraint applied to slip or stress-drop
(5) fast optimization algorithm based on the steepest descent method
Downloads ftp://ftp.gfz-potsdam.de/pub/home/turk/wang/sdm2011-code+input.rar
References - Wang, L., R. Wang, F. Roth, B. Enescu, S. Hainzl and S. Ergintav (2009), Afterslip and viscoelastic relaxation following the 1999 M 7.4 Izmit earthquake from GPS measurements, Geophysical Journal International, 178(3), 1220-1237.
 - Wang, R., B. Schurr, C. Milkereit, Zh. Shao and M. Jin (2011). An improved automatic scheme for empirical baseline correction of digital strong-motion records, Bulletin of the Seismological Society of America, 101(5), 2029–2044, doi: 10.1785/0120110039.
 - Wang, R., S. Parolai, M. Ge, M. Jin, T.R. Walter and J. Zschau (2012). The 2011 Mw 9.0 Tohoku Earthquake: Comparison of GPS and Strong-Motion Data. Bulletin of the Seismological Society of America, doi: 10.1785/0120110264.


=== Pyrocko - A seismology toolkit for Python ===
Downloads http://emolch.github.com/pyrocko/
Highlights- Snuffler - A nifty seismogram browser
- Cake - Classical ray theory module and tools
- Powerful infrastructure for off-line and real-time seismological data processing.


=== Kiwi Tools -Kinematic waveform inversion toolkit ===
Highlights(1) Modular framework for kinematic and moment tensor waveform inversion
(2) Green's function database infrastructure
(3) Fast synthetic seismogram synthesis for extended earthquake source models
(4) Autokiwi - Tool and infrastructure for automated event processing
Downloadshttp://kinherd.org/
References - Heimann, S., A Robust Method To Estimate Kinematic Earthquake Source Parameters, Universität Hamburg, Dissertation, 2011
 - Cesca, S., Heimann, S., Stammler, K., Dahm, T., Automated procedure for point and kinematic source inversion at regional distances, Journal of Geophysical Research - Solid Earth, Vol. 115, B06304, DOI: 10.1029/2009JB006450, 2010
 - Cesca, S., Heimann, S. and Dahm, T., Rapid directivity detection by azimuthal amplitude spectra inversion, Journal of Seismology, Vol. 15, No. 1, 147-164, DOI: 10.1007/s10950-010-9217-4, 2011


=== GmtPy - A Python interface to GMT (Generic Mapping Tools) ===
Downloads http://emolch.github.com/gmtpy/


=== Green's Function  ===
Downloadshttp://kinherd.org/avail.html

Conatct

Profile photo of  Dr. Sebastian Heimann

Dr. Sebastian Heimann
Physics of Earthquakes and Volcanoes

Helmholtzstraße 6/7
Building H 7, room 206
14467 Potsdam
tel. +49 331 288-28670

Conatct

Profile photo of  Dr. Rongjiang Wang

Dr. Rongjiang Wang
Physics of Earthquakes and Volcanoes

Helmholtzstraße 6/7
Building H 7, room 301
14467 Potsdam
tel. +49 331 288-1209