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Orbital forced cyclicity of reflector strength in the seismic records of the Cape Basin

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Weigelt, E. and Uenzelmann-Neben, G. (2007): Orbital forced cyclicity of reflector strength in the seismic records of the Cape Basin , Geophysical Research Letters, 34, L01702 . doi: 10.1029/2006GL028376
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Abstract:

A well-pronounced succession of continuous high-amplitude reflectors characterises the upper acoustic units off Southwest Africa as revealed in our seismostratigraphic study. We performed spectral analyses over age-transformed seismic traces. The results suggest a temporal regularity in the variation of reflector strength according to Milankovitch cycles since the Early Pliocene. Periods of 100 kyr/cycle between 0-2 Ma correspond to eccentricity modulations. From 2-3 Ma, shorter periods close to obliquity cycles prevail, whereas in even older units periodicity increases again to 100 kyr/cycle. We propose the cyclicity of high-amplitude reflectors is caused by orbitally driven climate variations, which modulate the sedimentary properties and with it the seismic reflectivity.

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