[Coral-List] Uplifted coral reefs

Serge Andrefouet serge at marine.usf.edu
Mon May 9 19:59:08 EDT 2005


HI Silvia,

I know, no doubt it was uplifted. Just that you can't tell so for the south 
of Nias from the two Aster images that Gene Shinn mentionned. That was my 
point... to be cautious in case someone thought the extent of the uplifting 
could be unambiguously quantified with this pair of images.


S.




A 01:56 PM 5/9/2005 -0700, Silvia Pinca a écrit :
>Dear Serge,
>The in situ observations confirm with no doubt that an uplift (about 2 m) 
>took place in NW Sumatra. The reef is completely exposed to the sun.
>Thank you
>silvia
>
>
>Serge Andrefouet <serge at marine.usf.edu> wrote:
>Hi Gene,
>
>Interesting. There are no doubts some areas were uplifted and I guess you
>have adequate ground-truthing around Nias, but these images alone would not
>demonstrate anything. The older one has a nice swell coming in (good surf
>that day in Nias I guess), and the later image has calmer seas. Also there
>may be a tide difference. The difference of signal along the crest can be
>only due to different set-up on the flats/crests and thus in differences in
>swell and tide, not uplifting. It is very common to see this on pair of
>images of the same site. No unambiguous changes on reefs detectable from
>space here, just different environmental conditions.
>
>As a clear example of similar pseudo-changes, there are two samples of
>Landsat images of a section of Majuro atoll (Marshalls) during two
>different tide cycles, different south swell conditions and different dates
>on http://imars.marine.usf.edu/~serge/Majuro .
>
>Cheers,
>
>S.
>
>
>
>
>
>A 04:55 PM 5/6/2005 -0400, Gene Shinn a écrit :
> >There has been much discussion on the coral-list about tsunami effects on
> >coral reefs in Indonesia but how many know of the extensive reef areas
> >around Sumatra that were uplifted (100 percent mortality)
> >as much as 2.5 meters by the more recent earthquake? To see a portion of
> >the uplifted reefs, recently surveyed by USGS geologists, see the
> >satellite images at,
> >http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=16 
> 892
> >Gene
> >--
> >
> >
> >No Rocks, No Water, No Ecosystem (EAS)
> >------------------------------------ -----------------------------------
> >http://coastal.er.usgs.gov/african_dust/
> >|
> >E. A. Shinn
> >email eshinn at usgs.gov
> >USGS Center for Coastal Geology |
> >600 4th St. South | voice (727) 803-8747 x3030
> >St.Petersburg, FL 33701 | fax (727) 803-2032
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>
>Serge Andrefouet
>UR Coreus - Institut de Recherche pour le Développement (IRD)
>BP A5 - 98848 Nouméa cedex - Nouvelle Calédonie
>Tél : (+687) 26 08 00 - Fax : (+687) 26 43 26 - andrefou at noumea.ird.nc
>
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>
>
>Silvia Pinca, Ph.D.
>Marine Science Program Coordinator
>College of the Marshall Islands
>P.O. Box 1258, Majuro, MH 96960
>ph. (692)-625-5903
>spinca at nras-conservation.org
>milviapin at yahoo.com
>www.nras-conservation.org
>
>
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Serge Andrefouet
UR Coreus - Institut de Recherche pour le Développement (IRD)
BP A5 - 98848 Nouméa cedex - Nouvelle Calédonie
Tél : (+687) 26 08 00 - Fax : (+687) 26 43 26 - andrefou at noumea.ird.nc



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