A Late Holocene geomagnetic secular variation record from Erhai Lake, southwest China |
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| Authors: | Masayuki Hyodo Arata Yoshihara Kenji Kashiwaya Takashi Okimura Toshiyuki Masuzawa Ryotaro Nomura Shingo Tanaka Tang Bang Xing Liu Su Qing & Liu Shi Jian |
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| Institution: | Research Center for Inland Seas, Kobe University, Kobe 657–8501, Japan. E-mail:;-u.ac.jp, Department of Earth and Planetary Sciences, Kobe University, Kobe 657–8501, Japan,; Department of Earth Sciences, Kanazawa University, Kanazawa 920–1192, Japan,; Research Center for Urban Security and Safety, Kobe University, Kobe 657–8501, Japan,; Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Nagoya 464–9601, Japan,; Department of Geography, Kobe University, Kobe 657–8501, Japan,;Institute of Mountain Disasters and Environment, Chinese Academy of Sciences, Chengdu, PO Box 417, Sichuan 610015, China |
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| Abstract: | A secular variation record of the geomagnetic field direction for the last 6.5 kyr has been obtained from the magnetization of sediment cores from Erhai Lake, southwest China. In order to make a comparison with this record, secular variation in east-central China was investigated by combining available magnetic field data from historical records and archaeomagnetic measurements since about 350 bc . The secular variation in Erhai Lake shows features consistent with the combined record, except for the oldest three observed declination swings in Sian from 720 to 900 ad . Many features of declination and inclination in China also occur in Japan. From 500 to 1000 ad , declination was westerly ranging from about −20° to −5° in Erhai Lake, east-central China, and Japan. |
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| Keywords: | geomagnetic variation palaeomagnetism sediments |
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