Bioko - Chapter I

The goal of the first chapter of my dissertation was providing a detailed inventory of volcanic structures and linking them to the local volcanic processes and the tectonic environment of Bioko Island (Equatorial Guinea). The three coalescing shield volcanoes on Bioko have not been studied in detail for decades although they provide a perfect setting to investigate the poorly understood interplay of complex volcano-tectonic processes. I used a high-resolution TSX / TDX derived DEM to map structural features like vents and scoria cones, faults, and other lineaments using GIS and ENVI. To quantify morphological shape factors of the major edifices and scoria cones, I used the MORVOLC algorithm by Grosse et al. (2012) . The azimuths of linear features were used to identify rift zones and were then linked the local and regional stress field. Furthermore, we identified indicators for volcano-tectonic processes like rifting, gravitational spreading, and buttressing effects.

I presented the results at the Cities on Volcanoes 11 conference in Heraklion (Greece) in June 2022, and the IUGG 2023 conference in Berlin (Germany) in July 2023. Look out for the first publication! I recently re-submitted the manuscript with revisions to the Bulletin of Volcanology. I will upload the presentations and the paper to ResearchGate. My collaborators on this project are Loÿc Vanderkluysen (Drexel), and Thomas R. Walter (GFZ). Furthermore, I want to acknowledge all collaborators from our fieldwork campaign on Bioko in Nov / Dec 2022, in particular Oscar A.N. Ela (UNGE), Guillaume Boudoire (UCA), and Christine R. Sealing (Drexel).