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There are two model files that contain the coefficients that
define the Global Dispersion Model GDM52 as described in the
GDM52 paper
Ekstrom, G., A global model of Love and Rayleigh 
surface-wave dispersion and anisotropy, 25-250 s,
Geophy. J. Int., doi:10.1111/j.1365-246X.2011.05225.x

RAYL_320_80_32000_8000.disp
LOVE_400_100.disp

These two files can be used to calculate dispersion at a
point or along a path using the FORTRAN program

GDM52_dispersion.f

When compiled and run, the program opens the two model files and 
then presents different options in the terminal window:
- calculate dispersion at a point
- calculate dispersion between two points
- calculate frequency-dependent azimuthal anisotropy at a point

The user selects an option and location(s) and the program
generates a table with output values at 100 frequencies
between 4 and 40 mHz (250 to 25 sec).

The output file is called GDM52_dispersion.out, and it is
overwritten whenever GDM52_dispersion is run. 
Within one session, the results are appended in the
same output file.

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Compilation:

The program is written in standard FORTRAN with extended source 
lines. Under Solaris and Linux, using Sun/Oracle compilers,
it compiles with
f77 -e GDM52_dispersion.f -o GDM52_dispersion
or
f95 -e GDM52_dispersion.f -o GDM52_dispersion

Using the GNU compilers, it compiles with 
gfortran -ffixed-line-length-132 -o GDM52_dispersion
or
g77 -ffixed-line-length-132 -o GDM52_dispersion

A sample script is included, compile.s

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Test scripts and sample output:

There are three sample scripts that can be used to test
that the output is correct.
sample1.s calculates Love wave dispersion at a point (Fig. 17)
sample2.s calculates Rayleigh wave dispersion for a path (Fig. 19)
sample3.s calculates azimuthal anisotropy at a point (Fig. 18)

The script sample1.s should generate an output file 
GDM52_dispersion.out that looks like the provided file
GDM52_dispersion_sample1.out
Analogously for the scripts sample2.s and sample3.s

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Problems with the programs or skeptical about the model output?
There could be bugs!
Please contact me at ekstrom@ldeo.columbia.edu
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GE 2011-10-26
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