Understanding the influence of seismic mantle structures at the core-mantle boundary on intense magnetic flux regions ...

Within the Priority Program 2404 “Reconstructing the Deep Dynamics of Planet Earth over Geologic Time” (DeepDyn) we investigate possible seismic signatures at magnetic high-latitude flux lobes (HLFL). The focus is on four target regions on the northern hemisphere: Siberia, Canada, North Atlantic and...

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Bibliographic Details
Main Authors: Fröhlich, Yvonne, Thiygarajan, Harini, Tölle, Lena Sophie, Ritter, Joachim R. R., Thomas, Christine
Format: Text
Language:English
Published: Zenodo 2024
Subjects:
geophysics
seismology
lowermost mantle
seismic anisotropy
seismic reflection
Canada
Indian
North Atlantic
Siberia
Online Access:https://dx.doi.org/10.5281/zenodo.10927349
https://zenodo.org/doi/10.5281/zenodo.10927349
Description
Summary:Within the Priority Program 2404 “Reconstructing the Deep Dynamics of Planet Earth over Geologic Time” (DeepDyn) we investigate possible seismic signatures at magnetic high-latitude flux lobes (HLFL). The focus is on four target regions on the northern hemisphere: Siberia, Canada, North Atlantic and Indonesia. While Siberia and Canada show the HLFL, the North Atlantic should be the location of a third postulated flux lobe, but this area shows no high-flux signal in the magnetic field. The region beneath Indonesia and the Indian Ocean is characterized by an area of high magnetic flux that changes direction and moves westwards over time. Our aim is to understand whether mineralogy and seismic structure (i.e., thermal constraints) could be responsible for the different magnetic signatures at the core mantel boundary (CMB). This is done by combining two approaches: seismic anisotropy and seismic reflections near the CMB. To study anisotropy, we measure shear wave splitting of SKS, SKKS, and PKS phases as well as ...

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