Joint Inversion Of Surface Wave And Gravity Data Reveals Subbasin Architecture Of The Congo Basin

A. Raveloson, A. Nyblade, R. Durrheim

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We investigated the architecture of the greater Congo Basin, one of the largest and leastwell-studied sedimentary basins on any continent. Seismograms from a large number of M > 4.5 earthquakes within and surrounding the African plate were used to make event-tostation Rayleigh wave group velocity measurements between periods of 5 and 100 s. Group velocities for discrete periods across the basin, obtained by inverting the event-station measurements, were jointly modeled with gravity data to obtain a three-dimensional S-wave and density model of the basin. The model corroborates the existence of two previously suggested subbasins, one to the north and one to the south, each ~8 km deep and separated by an eastwest structural high. Our results favor a salt tectonics origin for the structural high but cannot rule out uplifted basement rock. The northern subbasin is offset to the west from the southern subbasin, consistent with previous studies suggesting sinistral motion along basement faults during periods of transpressional tectonics in late Neoproterozoic–early Paleozoic times.

Original languageEnglish (US)
Pages (from-to)810-815
Number of pages6
JournalGeology
Volume49
Issue number7
DOIs
StatePublished - Jul 2021

All Science Journal Classification (ASJC) codes

  • Geology

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