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2005•Journal of CatastrophologyRequires access

Study and Analysis on Abnormal Changes in Magnetic Declination and Earthquake Precursory Anomaly at Mengcheng Magnetic Station

Hong Liu

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Abstract

AbstrcatFrom August, 2003, the changes in magnetic declination of relative observation are large than that before at Mengcheng magnetic station. The contrast analysis of the data of Mengcheng magnetic station with that of Shanghai Sheshan magnetic station shows that, for relative observation of magnetic declination at Mengcheng station, in addition to the long-term relative change of earth's magnetic field, there also exists mechanical drift of instrument and magnetic declination variation at Mengcheng station may attribute to physical factors of observation house.

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What this paper is about

AbstrcatFrom August, 2003, the changes in magnetic declination of relative observation are large than that before at Mengcheng magnetic station. The contrast analysis of the data of Mengcheng magnetic station with that of Shanghai Sheshan magnetic station shows that, for relative observation of magnetic declination at Mengcheng station, in addition to the long-term relative change of earth's magnetic field, there also exists mechanical drift of instrument and magnetic declination variation at Mengcheng station may attribute to physical factors of observation house.

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Available abstract

AbstrcatFrom August, 2003, the changes in magnetic declination of relative observation are large than that before at Mengcheng magnetic station. The contrast analysis of the data of Mengcheng magnetic station with that of Shanghai Sheshan magnetic station shows that, for relative observation of magnetic declination at Mengcheng station, in addition to the long-term relative change of earth's magnetic field, there also exists mechanical drift of instrument and magnetic declination variation at Mengcheng station may attribute to physical factors of observation house.

Key concepts: Declination, Magnetic declination, Magnetic anomaly, Magnetic field, Geodesy, Anomaly (physics), Geology, Earth's magnetic field

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