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A critical discussion of the electromagnetic radiation (EMR) method to determine stress orientations within the crust
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
Institute of Geosciences, Johannes-Gutenberg-University of Mainz, Mainz, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
Institute of Geosciences, Johannes-Gutenberg-University of Mainz, Mainz, Germany.
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2012 (English)In: Solid Earth, ISSN 1869-9510, E-ISSN 1869-9529, Vol. 3, no 2, 401-414 p.Article in journal (Refereed) Published
Abstract [en]

In recent years, the ElectroMagnetic Radiation (EMR) method has been used to detect faults and to determine main horizontal stress directions from variations in intensities and directional properties of electromagnetic emissions, which are assumed to be generated during micro-cracking. Based on a large data set taken from an area of about 250 000 km2 in Northern Germany, Denmark, and Southern Sweden with repeated measurements at one location during a time span of about 1.5 yr, the method was systematically tested. Reproducible observations of temporary changes in the signal patterns, as well as a strongly concentric spatial pattern of the main directions of the magnetic component of the EMR point to VLF transmitters as the main source and hence raise serious concerns about the applicability of the method to determine recent crustal stresses. We conclude that the EMR method, at its current stage of development, does not allow determination of the main horizontal stress directions.

Place, publisher, year, edition, pages
2012. Vol. 3, no 2, 401-414 p.
National Category
Earth and Related Environmental Sciences Geology
Identifiers
URN: urn:nbn:se:uu:diva-190682DOI: 10.5194/se-3-401-2012ISI: 000321443000005OAI: oai:DiVA.org:uu-190682DiVA: diva2:583993
Available from: 2013-01-08 Created: 2013-01-08 Last updated: 2017-12-06Bibliographically approved

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