Bob, this is recent so maybe not the discovery you meant, but it looks like an appropriate example. Here is the opening paragraph of an 11/1/01 NASA press release, and a comment by a researcher and lead author of the study. The link to the complete release is below.

> Scientists at NASA's Jet Propulsion Laboratory, Pasadena, Calif.,
> and the University of California, Los Angeles, have concluded that
> earthquake fault zones in California's eastern Mojave Desert are
> moving in different ways than they expected.
>
> "The most exciting thing is we discovered something we didn't expect.
> We were looking for deformation on the Garlock fault, but we saw in
> the image a concentration of shear along the Blackwater Little Lake
> fault, which cuts the Garlock fault at a right angle," said Dr. Gilles
> Peltzer, a UCLA professor and JPL research scientist who is the lead
> author of the study.

Mary

• Fault moving faster than believed