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\begin{document}

\title{The Intraplate Stress Field of West Africa}



\author[1]{Jean-Joel B. Legre}%
\author[2]{Yan Qin}%
\author[3]{Folarin Kolawole}%
\author[1]{Tolulope Morayo Olugboji}%
\affil[1]{University of Rochester}%
\affil[2]{Los Alamos National Laboratory}%
\affil[3]{Columbia University}%


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  \date{May 28, 2024}


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\begin{abstract}
West Africa continues to host a growing number of low and
intermediate-magnitude earth- quakes (M2-5) along its passive margins,
and its continental interior. Earthquake activity in these regions
raises the need to comprehend the causes and the tectonic controls of
the seismicity. Unfortunately, such studies are rare. Here, we apply
single-station inversion techniques to constrain fourteen focal
mechanisms, computed after compiling a set of high- quality waveforms.
We describe the connection between seismicity, the contemporary stress
field, anthropogenic activity, and Holocene fault scarps in the region.
Our results indicate transpressive stresses acting on the inherited
brittle structures in the passive margins. We also observe a compressive
regime in the intracontinental failed rifts. We attribute the seismicity
to the reactivation of `weak' faults in the Neoproterozoic and Mesozoic
failed rifts, the passive transform structures, and the intracratonic
Precambrian brittle shear zones.%
\end{abstract}%



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