Pre-historic secular variation of the geomagnetic field and its application to the archeomagnetic dating

  • HIROKA, Kimio (Principal Investigator)
  • WADA, Seigo (Co-Investigator(Kenkyū-buntansha))
  • NAKAJIMA, Tdashi (Co-Investigator(Kenkyū-buntansha))
  • UNO, Takao (Co-Investigator(Kenkyū-buntansha))
  • AKIYAMA, Singo (Co-Investigator(Kenkyū-buntansha))

Project Details

Abstract

It is reported that the geomagnetic excursion occurred several times during the Brunhes Normal Polarity Epoch. Paleomagnetic samples collected from the paleolithic excavation site of Babadan A, and the Nishiyagi excavation site show anomalous magnetic directions at Horizons 19 and 29 of Babadan A site, and at the horizons Stratum IV of the Nishiyagi site. From the similarity of the virtual geomagnetic pole path, the stratum IV of the Nishiyagi site might be correlated to the Ina I Excursion. Horizons 19 and 29 of the Babadan A site should be correlated to two of the following four excursions, that is, the Ina I Excursion, the Ina II Excursion, the Blake Event and Biwa I Event.
StatusFinished
Effective start/end date1984/01/01 → 1986/12/31

Funding

  • Japan Society for the Promotion of Science: ¥26,400,000.00

Keywords

  • 地磁気永年変化
  • 地磁気エクスカーション
  • 堆積残留磁化
  • 地震活動による再磁化
  • 地震動による再帯磁
  • Secular variation of Geomagnetic field
  • Geomagnetic Excursion
  • Detrital Remanent Magnetization

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