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Re: Tectonic News



I have a question, though. How old is the Rift Valley? Shouldn't the continent have rifted by now unless something happened to the rifting process?

Yours,
Dora Smith
Austin, TX
villandra@austin.rr.com



tholtz@geol.umd.edu wrote:

Folks, this article says a rift created in northern Ethiopia by a recent
earthquake is the beginning of continental rifting.

I don't think so.  That would take more than a single minor fault!

And the Rift Valley is a failed continental rift.   It runs to that
region.   Occasionally tectonic activity happens along those old failed
rifts.




The hypothesis that the Rift Valley is a failed rift is outdated. Numerous lines of research in the 1990s, including work using GPS readings, has demonstrated that it is still active, and that the Ethiopian section of Africa (aka the Ethiopian Plate) is headed eastward relative to the rest of Africa at rates comparable to those of other divergent boundaries. So, cool news of the manifestation of the latest rip in the Rift Valley!

               Thomas R. Holtz, Jr.
       Senior Lecturer, Vertebrate Paleontology
Department of Geology           Director, Earth, Life & Time Program
University of Maryland          College Park Scholars
       Mailing Address:
               Building 237, Room 1117
               College Park, MD  20742

http://www.geol.umd.edu/~tholtz/
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