The software that is made available on this page has been developed by many authors. The most important contributions came from (in alphabetical order): Jean Charlety, Shu-Huei Hung, Raffaella Montelli, Guust Nolet, Karin Sigloch, Yue Tian and Jean Virieux.

We are still in the process of writing more extensive manuals, for now you'll have to make do with what is offered. At times you may have to consult the program itself (e.g. for output formats).

For an extensive
background see
Nolet, G., *A Breviary for Seismic Tomography*, Cambridge Univ. Press
(2008). Click here for a running
list of errata.
You can also download the
Solutions to the Excercises, courtesy of
Yue Tian.

In the following, equation numbers refer to the equations
in this book, sometimes referred to as *Breviary*.

There are two packages of software. The first one,
program **Raydyntrace.f** is a
stand-alone program that can be used to program your own banana-dougnut
kernels in a spherical Earth. The latest version (Jan 15, 2014)
has improved crustal
corrections in oceanic areas (including for OBS's) and computes also
reflection- and transmission coeficients.

Those who have already developed their own tomography software, and wish
to move from single-frequency, ray-theoretical inversions to multiple-frequency inversions using banana-doughnut kernels, shall wish to use this
program. It provides all variables needed to program eq. (7.28) or its
simplified version (7.20) for cross-correlation delay times, eq. (7.30)
for delays obtained by cross-correlation waveform fitting, or the
expression for waveform maxima picks (see page 136 of *Breviary*).

It can be used with the paraxial approximation (computing detour times for scatterers off the geometrical ray path assuming the wavefront has a parabolic shape), but it can also be used to provide a table of all necessary parameters to be used in a table look-up. The tar file contains extensive documentation as well as examples.

The package of programs that we use ourselves to compute the matrix and solve the system is still in continuous evolution, most recently because we have abandoned irregular tetrahedrons as parameters, and replaced this with a cubic Earth representation. We therefore do not put the software up on the web, but if you are interested in acting as a guinea pig and help testing whatever is available, please contact Guust Nolet (nolet@geoazur.unice.fr).

The latest version has the programs *grafbdyn.f, matrix3D.f*
and * assemblematrix3D.f*, as well as a number of utilities
to plot or analyse the output. These result in a fully assembled
matrix, including correction factors.

The final MPI program *mpisolvetomo3D.f* that does
the inversion is still subject to
changes and improvements. It is available in its beta-version to
whoever wishes to collaborate with us. If you are interested
in this, please contact Guust Nolet (nolet@geoazur.unice.fr)

The package BD3D.19Apr2013.tar.gz has all you need to compute banana-dougnut kernels and the matrix in a 3D Cartesian model.

The BD3D manual is currently being written, the latest version can be downloaded separately.

1. Nolet, G., *A Breviary for Seismic Tomography*, Cambridge Univ. Press, 2008.

2. Tian, Y., G. Nolet, F.A. Dahlen, S.-H. Hung and R. Montelli, Dynamic ray tracing and traveltime corrections in finite-frequency tomography, *J. Comp. Phys.*, **226**, 672-687, 2007.

3. Tian, Y.,R. Montelli, G. Nolet, and F.A. Dahlen, Computing traveltime and amplitude sensitivity kernels in finite-frequency tomography, *J. Comp. Phys.*, **226**, 2271-2288, 2007a.

3. Joubert, C., G. Nolet, A. Sukhovich, A. Oge, J.-F. Argentino and Y. Hello, Hydrophone calibration at very low frequencies, *Bull. Seism. Soc. Am.*, submitted August 2014