M. NDIAYE ET AL. 209
Figure 6. Fourier spectrum of black laminae signal. The
periods corresponding to the main peaks are indicated in
blue.
Figure 7. Wavelet analysis of black laminae signal.
tervals displaying increasing ENSO frequencies a
4. Conclusions
bine image analysis and signal proc
tion step is the critical part
of
ed sediments
an
5. Acknowledgements
f Strati-signal software fo
CES
[1] M. Ripepe, L. T. Roberts and A. G. Fischer, “Enso and
Sunspot CycleShales from Image
Analysis,” Jo esearch, Vol. 61,
l Tidal Rhythmites in Madre de
inre
separated by comparatively calm periods.
In this work we com-
essing methods to perform a semi-automated analysis on
varved sediment. The interest of varves study, which
presents annual deposition of the couplets, can be found
in paleo climatology studies.
We noted that the classifica
laminated sediments analysis as it depends on the
quality of the input data. Moreover, parameters setting
are widely based on empirical approach.
The methodology developed for laminat
alysis can be easily extended to other fields of geo-
sciences where data pr esent time related laminations such
as stromatolites, tree rings in dendrochronology, ice
cores, etc. to emphasize existence of cyclic events.
Thanks to all beta testers or
the ir feedbacks. Thanks to Nicolas Waldmann a nd A dr ian
Gilli for the Lago Cardiel da ta.
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