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  Electromagnetic monitoring of volcanic systems, preliminary comparative phase tensor analysis of Mount St Helens magnetotelluric data

Karcioglu, G., Hill, G., Moorkamp, M., Avram, Y., Hogg, C., Gahr, S., Mateschke, K., Schultz, A., Bowles-Martinez, E., Peacock, J., Chaojian, C., Cimarelli, C., Caricchi, L., Ogawa, Y., Kiyan, D. (2023): Electromagnetic monitoring of volcanic systems, preliminary comparative phase tensor analysis of Mount St Helens magnetotelluric data, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4031

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021471 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021471_1
Genre: Conference Paper

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 Creators:
Karcioglu, Gokhan1, Author
Hill, Graham1, Author
Moorkamp, Max1, Author
Avram, Yann1, Author
Hogg, Colin1, Author
Gahr, Sofia1, Author
Mateschke, Kathi1, Author
Schultz, Adam1, Author
Bowles-Martinez, Esteban1, Author
Peacock, Jared1, Author
Chaojian, Chen1, Author
Cimarelli, Corrado1, Author
Caricchi, Luca1, Author
Ogawa, Yasuo1, Author
Kiyan, Duygu1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The Cascade arc runs from Southern British Columbia through Northern California and developed by the subduction of the Juan de Fuca plate beneath North America. Among the volcanoes of the Northern Cascades, Mount St Helens (MSH) is the most active.Inter-connected melt within the underlying magmatic systems of volcanic regions allow identification of the system via Magnetotelluric (MT) imaging due to the sensitivity of the method to electrical conductivity. Time variance of the properties of the melt due to changes in eruptive activity may result in significant conductivity changes that can be identified with continuous MT monitoring. Galvanic distortions resulting from the small near-surface conductivity variations may can be difficult to separate from the expected subtle observational differences. However, impedance phase relations in MT are free of these galvanic distortions. Thus, by exploiting changes in the phase response (the MT Phase tensor), it is possible to identify the temporal conductivity changes associated with changes occurring within the magmatic system.Prior MT results in the Washington cascades show a significant conductive anomaly underneath the MSH attributed to be partial melt supplying the volcano. With the aim of revealing conductivity changes beneath MSH, both a campaign style reoccupation of measurements completed during the 2004-2008 dome building eruption, and installation of four ‘continuous’ monitoring MT stations has been completed. Among the new MT dataset, a preliminary comparative phase tensor analysis of 56 repeated measurements identifies conductivity changes at frequencies that correlate the depth of the partial melt within the magmatic system.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-4031
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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
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -