Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil

Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conducti...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Pádua, Marcelo B. [verfasserIn] Padilha, Antonio L. [verfasserIn] Vitorello, Ícaro [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2002

Schlagwörter:	Electromagnetic Noise Magnetotellurics MAGNETOTELLURIC Data Remote Reference Magnetic Channel

Anmerkung:	© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002

Übergeordnetes Werk:	Enthalten in: Earth, planets and space - Springer Berlin Heidelberg, 1998, 54(2002), 5 vom: Mai, Seite 591-596
Übergeordnetes Werk:	volume:54 ; year:2002 ; number:5 ; month:05 ; pages:591-596

Links:	Volltext

DOI / URN:	10.1186/BF03353047

Katalog-ID:	SPR036901032

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520			\|a Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some well-defined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique.
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allfields	10.1186/BF03353047 doi (DE-627)SPR036901032 (SPR)BF03353047-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Pádua, Marcelo B. verfasserin aut Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002 Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some well-defined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique. Electromagnetic Noise (dpeaa)DE-He213 Magnetotellurics (dpeaa)DE-He213 MAGNETOTELLURIC Data (dpeaa)DE-He213 Remote Reference (dpeaa)DE-He213 Magnetic Channel (dpeaa)DE-He213 Padilha, Antonio L. verfasserin aut Vitorello, Ícaro verfasserin aut Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 54(2002), 5 vom: Mai, Seite 591-596 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:54 year:2002 number:5 month:05 pages:591-596 https://dx.doi.org/10.1186/BF03353047 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 54 2002 5 05 591-596
spelling	10.1186/BF03353047 doi (DE-627)SPR036901032 (SPR)BF03353047-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Pádua, Marcelo B. verfasserin aut Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002 Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some well-defined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique. Electromagnetic Noise (dpeaa)DE-He213 Magnetotellurics (dpeaa)DE-He213 MAGNETOTELLURIC Data (dpeaa)DE-He213 Remote Reference (dpeaa)DE-He213 Magnetic Channel (dpeaa)DE-He213 Padilha, Antonio L. verfasserin aut Vitorello, Ícaro verfasserin aut Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 54(2002), 5 vom: Mai, Seite 591-596 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:54 year:2002 number:5 month:05 pages:591-596 https://dx.doi.org/10.1186/BF03353047 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 54 2002 5 05 591-596
allfields_unstemmed	10.1186/BF03353047 doi (DE-627)SPR036901032 (SPR)BF03353047-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Pádua, Marcelo B. verfasserin aut Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002 Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some well-defined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique. Electromagnetic Noise (dpeaa)DE-He213 Magnetotellurics (dpeaa)DE-He213 MAGNETOTELLURIC Data (dpeaa)DE-He213 Remote Reference (dpeaa)DE-He213 Magnetic Channel (dpeaa)DE-He213 Padilha, Antonio L. verfasserin aut Vitorello, Ícaro verfasserin aut Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 54(2002), 5 vom: Mai, Seite 591-596 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:54 year:2002 number:5 month:05 pages:591-596 https://dx.doi.org/10.1186/BF03353047 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 54 2002 5 05 591-596
allfieldsGer	10.1186/BF03353047 doi (DE-627)SPR036901032 (SPR)BF03353047-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Pádua, Marcelo B. verfasserin aut Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002 Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some well-defined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique. Electromagnetic Noise (dpeaa)DE-He213 Magnetotellurics (dpeaa)DE-He213 MAGNETOTELLURIC Data (dpeaa)DE-He213 Remote Reference (dpeaa)DE-He213 Magnetic Channel (dpeaa)DE-He213 Padilha, Antonio L. verfasserin aut Vitorello, Ícaro verfasserin aut Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 54(2002), 5 vom: Mai, Seite 591-596 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:54 year:2002 number:5 month:05 pages:591-596 https://dx.doi.org/10.1186/BF03353047 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 54 2002 5 05 591-596
allfieldsSound	10.1186/BF03353047 doi (DE-627)SPR036901032 (SPR)BF03353047-e DE-627 ger DE-627 rakwb eng 550 VZ 38.70 bkl 39.22 bkl Pádua, Marcelo B. verfasserin aut Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002 Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some well-defined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique. Electromagnetic Noise (dpeaa)DE-He213 Magnetotellurics (dpeaa)DE-He213 MAGNETOTELLURIC Data (dpeaa)DE-He213 Remote Reference (dpeaa)DE-He213 Magnetic Channel (dpeaa)DE-He213 Padilha, Antonio L. verfasserin aut Vitorello, Ícaro verfasserin aut Enthalten in Earth, planets and space Springer Berlin Heidelberg, 1998 54(2002), 5 vom: Mai, Seite 591-596 (DE-627)353898597 (DE-600)2087663-4 1880-5981 nnns volume:54 year:2002 number:5 month:05 pages:591-596 https://dx.doi.org/10.1186/BF03353047 X:SPRINGER Resolving-System lizenzpflichtig Volltext SYSFLAG_0 GBV_SPRINGER SSG-OPC-GGO SSG-OPC-GEO SSG-OPC-AST GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 38.70 VZ 39.22 VZ AR 54 2002 5 05 591-596
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author	Pádua, Marcelo B.
spellingShingle	Pádua, Marcelo B. ddc 550 bkl 38.70 bkl 39.22 misc Electromagnetic Noise misc Magnetotellurics misc MAGNETOTELLURIC Data misc Remote Reference misc Magnetic Channel Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil
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topic_title	550 VZ 38.70 bkl 39.22 bkl Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil Electromagnetic Noise (dpeaa)DE-He213 Magnetotellurics (dpeaa)DE-He213 MAGNETOTELLURIC Data (dpeaa)DE-He213 Remote Reference (dpeaa)DE-He213 Magnetic Channel (dpeaa)DE-He213
topic	ddc 550 bkl 38.70 bkl 39.22 misc Electromagnetic Noise misc Magnetotellurics misc MAGNETOTELLURIC Data misc Remote Reference misc Magnetic Channel
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title	Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil
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title_full	Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil
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title_sort	disturbances on magnetotelluric data due to dc electrified railway: a case study from southeastern brazil
title_auth	Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil
abstract	Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some well-defined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique. © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002
abstractGer	Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some well-defined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique. © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002
abstract_unstemmed	Abstract Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal to the Campos do Jordão Railway (CJRW), in the Brazilian southeastern region. The profiles were located over two adjacent regions with contrasting conductivity, the conductive sedimentary region of the Taubaté Basin and the resistive crystalline region of the Serra da Mantiqueira. The railway operates with DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. The objective of this study is to characterize the CJRW noise in order to verify its effect on MT parameters. It was inferred that the entire length of the Taubaté Basin is probably affected by the noise, whereas in the crystalline terrains the noise reaches distances in the range of 76 to 126 km. The electric channels show a strong dependence on geology which is suggestive of the potential application of the CJRW as a controlled source in geophysical studies. The data were processed with modern techniques presently available to the scientific community. Under the conditions of the present study, it was observed that the robust Single Station technique is as efficient as the robust Remote Reference to remove the kind of noise generated by the CJRW, an intense perturbation that affects only some well-defined portions of the time series. Finally, the analyses reaffirm the necessity of a careful choice of the station to be used as reference in the Remote Reference technique. © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2002
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title_short	Disturbances on magnetotelluric data due to DC electrified railway: A case study from southeastern Brazil
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