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

• Padua Marcelo B.

  Instituto Nacional de Pesquisas Espaciais - INPE

• Padilha Antonio L.

  Instituto Nacional de Pesquisas Espaciais - INPE

• Vitorello Icaro

  Instituto Nacional de Pesquisas Espaciais - INPE

抄録

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 welldefined 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.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 54 (5), 591-596, 2002

  地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

キーワード

• Space and Planetary Science
• Geology

詳細情報

• CRID: 1390001206513372672
• NII論文ID: 10008600546
• NII論文ID: 130003780908
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03353047
• ISSN: 18805981
• ISSN: 13438832
• NDL書誌ID: 6166394
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6166394
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03353047.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03353047/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03353047
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
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