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S&MG Research Group Software


AK135 travel-time tables and ellipticity corrections
AK135 velocity model, tables, plots and software
ZDF analysis facilities for 3-component data:
Versions 2 and 3

Release 4.0 with Java GUI [still experimental]

Neighbourhood algorithm for nonlinear inversion
Adaptive stacking
for arrival time residual estimation and array beamforming.

Fast marching traveltime code in 3-D spherical coordinates
for tracking phases comprising any number of reflection and transmission branches in complex layered media. Uses fast marching to compute traveltimes, and can also generate raypaths and Frechet derivatives.

FMTT: a teleseismic tomography code
for mapping relative arrival time residuals as 3-D variations in wavespeed beneath a seismic array.

FMST: a spherical shell (surface wave) tomography code
for mapping traveltime residuals as 2-D variations in wavespeed.

FMTOMO
for mapping a variety of traveltime datasets (e.g. local earthquake, teleseismic, reflection, wide-angle) as 3-D variations in seismic wavespeed and interface structure. Sources may also be relocated.

hypoDD
Fortran77 program for relocating earthquakes with the double-difference algorithm of Waldhauser and Ellsworth (2000). On SUN Solaris 10 x86 only with command: hypoDD

IRFFM
Interactive receiver function forward modeller - for interactive forward modelling of receiver functions. It can be used as a stand alone tool or as a complement to inversion.



Seismic Tomography with Irregular Parameterization
Traditional methods of seismic tomography represent structure in terms of regular grids or truncated Fourier series, both of which may be inconsistent with the inhomogeneous distribution of data that characterizes most seismic surveys. In such circumstances, the extraction of structural information from the data is not maximized. With an inhomogeneous distribution of data, the minimum wavelength of structure that can be resolved varies both spatially and directionally; only an irregular parameterization is capable of capturing such information.

A Regionalized Seismic Model (RUM)
We simultaneously invert for 1-D P and S-velocity models inside each tectonic region of Earth, each defined with by iregular 3-D parameterization. A description of the RUM project with figures and results can be found here.