last updated 6/11/98
Scientists: Oleg Vdovin, Mike Ritzwoller, Anatoli
(University of Colorado), Jose Rial (UNC-Chapel Hill).
Analysts: Dave Tremblay, Mike Silitch.
We present the results of a tomographic
study of surface wave dispersion across South America.
We include below links to graphical images of the group velocity maps.
In each case, images are presented in gif format (for down
loading), and the ascii data files are also available (follow the
link for Group Velocity Maps).
Files with event - station locations
and group velocity measurements are provided. The data are used for
tomographic inversion to construct group velocity maps. We have also
provided the Path Coverage
information for each period and wave type. These images show the number
of seismic paths crossing a cell of approximately 50,000 km^2 for every
location on the map.
No models are available for distribution
yet. To check on the status and availability of the latest
maps and models, contact Oleg Vdovin at the email address listed above.
of earthquakes and stations around South American
velocity - frequency analysis
of cluster analysis
example for plotting data files across South America (4
Oleg Vdovin, Jose A. Rial, Anatoli L.Levshin and Michael H. Ritzwoller
"Group velocity tomography of South America and the surrounding oceans"
Geophys. J. International (1999) 136, 324-340.
If you have questions, comments
or suggestions, email Mike Ritzwoller at email@example.com
to Geophysics Group Home Page.