Seismotectonic lineament mapping over parts of Togo-Benin-Nigeria shield

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Abstract

This study carried out a seismotectonic analysis of parts of Togo-Benin-Nigeria shield by delineating and characterising crustal discontinuities using gravity bouguer anomaly data. This was with a view to understand the significance of the discontinuities to the seismicity of the area. Three dimensional (3-D) Euler deconvolution and horizontal gradient magnitude (HGM) at varied upward continued layer were applied on the filtered bouguer gravity data to highlight crustal discontinuities and determine their dip directions. The result showed that 89 lineaments were mapped as faults/fractures from the gravity data. The lengths of the lineaments range from about 6.2 to 94.3 km. The prominent fault/fracture trends were in the N-S and NNE-SSW directions with less dominant trends in the NE-SW and NW-SE directions. The prominent N-S trend pattern aligns with the general N-S foliation strike emplacement across the shield. The Lagos-Ibadan-Ijebu-Ode fault line was identified in this map as having close proximity to locations of previous earth tremors and therefore might be associated to those events.

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NRIAG Journal of Astronomy and Geophysics
Volume 9, Issue 1
January 2020
Pages 539-547

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