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  Modelling and inversion of electromagnetic data in volcanic regions – The effect of topography

Maetschke, K., Chen, C., Moorkamp, M., Hill, G. J., Avram, Y., Hogg, C., Gahr, S., Kiyan, D., Schultz, A., Bowles-Martinez, E., Peacock, J., Karcioglu, G., Cimarelli, C., Carrichi, L., Ogawa, Y. (2023): Modelling and inversion of electromagnetic data in volcanic regions – The effect of topography, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2398

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Item Permalink: https://gfzpublic.gfz.de/pubman/item/item_5018359 Version Permalink: https://gfzpublic.gfz.de/pubman/item/item_5018359_1
Genre: Conference Paper

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 Creators:
Maetschke, Katharina1, Author
Chen, Chaojian1, Author
Moorkamp, Max1, Author
Hill, Graham J.1, Author
Avram, Yann1, Author
Hogg, Colin1, Author
Gahr, Sophia1, Author
Kiyan, Duygu1, Author
Schultz, Adam1, Author
Bowles-Martinez, Esteban1, Author
Peacock, Jared1, Author
Karcioglu, Gokhan1, Author
Cimarelli, Corrado1, Author
Carrichi, Luca1, Author
Ogawa, Yasuo1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Unravelling the internal structure of volcanoes is an essential step to understand the architecture of the magmatic system and advance hazard assessment. Electromagnetic (EM) measurements are particularly suited for this task due to the high contrast in resistivity between melts and solid rock. Due to this, EM surveys of active volcanoes have gained significant attention in recent years. However, many modelling and inversion algorithms only provide a rough approximation of the significant topography of the volcanoes. Currently it is not clear to which level the topography has to be incorporated to provide reliable and robust results. We use two modern finite-element modelling algorithms for magnetotelluric data to assess the impact of different approximations. Based on the geometry of a recent survey at Mt. St Helens we will compare the results of the two algorithms with different topography approximations. We will discuss different strategies for incorporating topography and how to ensure valid calculations of magnetotelluric forward responses.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-2398
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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