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Conference Paper

Temporal variations visible in induction arrows and their spatial distribution - preliminary results

Authors

Bury,  Agata
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

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https://gfzpublic.gfz-potsdam.de/pubman/item/item_5001439
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EMTF_2019_HalternAmSee_05x_Bury.pdf
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Citation

Bury, A. (2020): Temporal variations visible in induction arrows and their spatial distribution - preliminary results. - In: Börner, J., Yogeshwar, P., Becken, M. (Eds.), - Protokoll über das 28. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung: Haltern am See, 23.-27. September 2019, 28. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung (Haltern am See 2019), 38-44.


Cite as: https://gfzpublic.gfz.de/pubman/item/item_5002002
Abstract
Magnetotellurics is a passive sounding method using natural electromagnetic field variations
of the Earth to determine the electrical resistivity structures beneath the Earth’s
surface. It means that in a geologically stable region transfer functions (which carry
information about subsurface resistivity) should not change in time. However research
has shown significant seasonal changes visible in induction arrows independent of geologic
processes (see e.g., Ernst et al., 2019, Araya Vargas & Ritter, 2015, Br¨andlein et
al., 2012). This suggests that source effects may cause that the plane wave assumption
is not always fullfilled. The aim of this work is to analyze ground observatory data to
find seasonal changes in the induction arrows along with the spatial distribution of such
changes. For that purpose data from 30 permanent observatories were chosen. Observatories
were selected based on their data quality and their location. Locations were chosen
to provide representation of all main regions of the world and to investigate dependence
on geomagnetic latitude.