Earth conductivity structures and their effects on geomagnetic induction in pipelines
Anomalous, large pipe-to-soil potentials (PSP) have been observed along a natural gas pipeline in eastern Ontario, Canada, where there is a major geological contact between the highly resistive rocks of the Precambrian Shield to the west and the more conductive Paleozoic sediments to the east. T...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2007-02-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/25/207/2007/angeo-25-207-2007.pdf |
| _version_ | 1828256483457892352 |
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| author | P. A. Fernberg P. A. Fernberg C. Samson D. H. Boteler L. Trichtchenko P. Larocca |
| author_facet | P. A. Fernberg P. A. Fernberg C. Samson D. H. Boteler L. Trichtchenko P. Larocca |
| author_sort | P. A. Fernberg |
| collection | DOAJ |
| description | Anomalous, large pipe-to-soil potentials (PSP) have been observed along a
natural gas pipeline in eastern Ontario, Canada, where there is a major
geological contact between the highly resistive rocks of the Precambrian
Shield to the west and the more conductive Paleozoic sediments to the east.
This study tested the hypothesis that large variations of PSP are related to
lateral changes of Earth conductivity under the pipeline. Concurrent and
co-located PSP and magnetotelluric (MT) geophysical data were acquired in
the study area. Results from the MT survey were used to model PSP variations
based on distributed-source transmission line theory, using a
spatially-variant surface geoelectric field. Different models were built to
investigate the impact of different subsurface features. Good agreement
between modelled and observed PSP was reached when impedance peaks related
to major changes of subsurface geological conditions were included. The
large PSP could therefore be attributed to the presence of resistive
intrusive bodies in the upper crust and/or boundaries between tectonic
terranes. This study demonstrated that combined PSP-MT investigations are a
useful tool in the identification of potential hazards caused by
geomagnetically induced currents in pipelines. |
| first_indexed | 2024-04-13T02:29:49Z |
| format | Article |
| id | doaj.art-dc52c25e1120445d81ee2b831c908372 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-13T02:29:49Z |
| publishDate | 2007-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-dc52c25e1120445d81ee2b831c9083722022-12-22T03:06:39ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762007-02-012520721810.5194/angeo-25-207-2007Earth conductivity structures and their effects on geomagnetic induction in pipelinesP. A. Fernberg0P. A. Fernberg1C. Samson2D. H. Boteler3L. Trichtchenko4P. Larocca5Dept. of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, CanadaNatural Resources Canada, 7 Observatory Crescent, Ottawa, ON, K1A 0Y3, CanadaDept. of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, CanadaNatural Resources Canada, 7 Observatory Crescent, Ottawa, ON, K1A 0Y3, CanadaNatural Resources Canada, 7 Observatory Crescent, Ottawa, ON, K1A 0Y3, CanadaEngineering School, University of Buenos Aires, Paseo Colón 750 Buenos Aires, ArgentinaAnomalous, large pipe-to-soil potentials (PSP) have been observed along a natural gas pipeline in eastern Ontario, Canada, where there is a major geological contact between the highly resistive rocks of the Precambrian Shield to the west and the more conductive Paleozoic sediments to the east. This study tested the hypothesis that large variations of PSP are related to lateral changes of Earth conductivity under the pipeline. Concurrent and co-located PSP and magnetotelluric (MT) geophysical data were acquired in the study area. Results from the MT survey were used to model PSP variations based on distributed-source transmission line theory, using a spatially-variant surface geoelectric field. Different models were built to investigate the impact of different subsurface features. Good agreement between modelled and observed PSP was reached when impedance peaks related to major changes of subsurface geological conditions were included. The large PSP could therefore be attributed to the presence of resistive intrusive bodies in the upper crust and/or boundaries between tectonic terranes. This study demonstrated that combined PSP-MT investigations are a useful tool in the identification of potential hazards caused by geomagnetically induced currents in pipelines.https://www.ann-geophys.net/25/207/2007/angeo-25-207-2007.pdf |
| spellingShingle | P. A. Fernberg P. A. Fernberg C. Samson D. H. Boteler L. Trichtchenko P. Larocca Earth conductivity structures and their effects on geomagnetic induction in pipelines Annales Geophysicae |
| title | Earth conductivity structures and their effects on geomagnetic induction in pipelines |
| title_full | Earth conductivity structures and their effects on geomagnetic induction in pipelines |
| title_fullStr | Earth conductivity structures and their effects on geomagnetic induction in pipelines |
| title_full_unstemmed | Earth conductivity structures and their effects on geomagnetic induction in pipelines |
| title_short | Earth conductivity structures and their effects on geomagnetic induction in pipelines |
| title_sort | earth conductivity structures and their effects on geomagnetic induction in pipelines |
| url | https://www.ann-geophys.net/25/207/2007/angeo-25-207-2007.pdf |
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