Systematic multi-technique mapping of the Southern flank of Iwaraja fault

An Evaluation of the 11<sup>th</sup> September, 2009 Earthquake and Its Implication for Understanding the Seismotectonics of South Western Nigeria

“…There has also been suggestion of the Atlantic fracture zones projecting into the Nigerian continental landmass [4] [12] [33]. Recent research has also shown the extension of one of the Atlantic fractures into the continental landmass as zones of weaknesses within the Nigeria Precambrian basement [34] [35]. The fault was named the Ifewara-Zungeru fault and the characteristics of the southern part of the fault zone were given [35].…”

“…Recent research has also shown the extension of one of the Atlantic fractures into the continental landmass as zones of weaknesses within the Nigeria Precambrian basement [34] [35]. The fault was named the Ifewara-Zungeru fault and the characteristics of the southern part of the fault zone were given [35]. Therefore, the sources of the past earthquakes experienced in south western Nigeria and southern Benin Republic is related to movement along these fault zones [1]…”

A review of earthquake occurrences and observations in Nigeria

“…The epicenter of the 1994 tremor also lies along the northern extension of this fault zone. Recent studies (Adepelumi et al, 2008;Anifowose et al, 2010) on the southern part of the fault zone using integrated remote sensing and geophysical techniques described the characteristics of this NNE-SSW fracture zone. The extension of this fault southwards under the Cretaceous to Recent sediments of the Dahomey basin into the Atlantic Ocean as fracture zones had been identified by Wright (1976), Elueze (2003) and Odeyemi (2006).…”

Quantifying in Situ Horizontal Stress in the Niger Delta Basin, Nigeria

“…Wright (1978) reported that the ENE-WSW trending Romanche Fracture Zone which separates the North and South Atlantic oceans, and the Chain Fracture Zone are the principal lines of weakness in the African continental crust. Some authors (Adepelumi et al, 2008;Anifowose et al, 2010;Babalola et al, 1991) suggested a link of the Chain Fracture Zone with regional onshore faults particularly the NE-SW trending Ifewara-Zungeru complex fault systems which cut across old metamorphic basement complex rocks and younger sedimentary rocks. The Table II for details).…”