Occam's Inversion Homepage
"...a heuristic algorithm, lacking theoretical underpinnings, but one
that has been found to be remarkably effective in practice"
(Bob Parker
in Geophysical Inverse Theory)
It has been nearly a decade since a new version of OCCAM2DMT was released.
Faster smooth inversion codes became available and interest in OCCAM seemed
to diminish, and so I was under no pressure to release upgrades. However, until
very recently OCCAM was still the only code that could handle bathymetry, thanks
to Phil Wannamaker's forward modules, so naturally our group at Scripps (Catherine
deGroot-Hedlin, Kerry Key, and David Myer) kept using it, improving it, and
making it faster. Of course, computers got much speedier over the years too.
Now a simple example I distributed in 1992 which took over 67 hours to do 5
iterations on my desktop runs in less than 5 seconds on my laptop. So here
is the latest version, fully open source, with a MATLAB rear end
for plotting models, responses, pseudosections and profiles. Now you too can
run what Doug Oldenburg once called "the
Rolls-Royce of inversion schemes".
Updates:
October, 2009: Occam1DCSEM is now available and contains the most up-to-date changes to the Occam's inversion source code.
1D Controlled-source EM (CSEM) and Magnetotelluric (MT) Inversion
2D magnetotelluric (MT) modeling
Catherine's Sharp Boundary 2D MT inversion (f77 version)
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