Background Shear wave splitting (SWS) can be used to detect seismic anisotropy in the lowermost mantle (LMM) based on phase pair discrepancies, in particular by analyzing SKS and SKKS phases. Within the DFG Priority Program (SPP) 2404 "Reconstructing the Deep Dynamics of Planet Earth over Geologic Time" (DeepDyn, https://www.geo.lmu.de/deepdyn/en/) we investigate target regions associated with intense magnetic flux. In the first funding period we concentrate on the northern hemisphere, especially on the LMM beneath Siberia, the North Atlantic, Canda and Indonesia. This poster focuses on the target regions Siberia and North Atlantic and shows SWS measurements and SKS-SKKS pairs at the recording station KEF (HE) in Finland. See also Proceedings of the18th Symposium of Study of the Earth's Deep Interior DeepDyn - DFG Priority Programm 2404 Funding Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – 521545943under Germany’s Priority Programme "Reconstructing the deep dynamics of planet Earth over geologic time (DeepDyn)" SPP 2404 – 500707704.