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《Chinese Journal of Geophysics》 2000-01
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WESTWARD DRIFT OF THE GEOMAGNETIC ANOMALY IN EAST ASIA

WEI ZI-GANG; XU WEN-YAO(Institute of Geology and Geophysics. Chinese Academy of Sciences, Beijing 100101, China)  
The westward drift is one of the most important characteristics of thesecular variation in the Earth's main magnetic field. The most obvious westward driftoccurs in the non-dipole magnetic fields. In this paper we analyzed East Asiageomagnetic anomaly by using the correlation analysis of moving random patternbased on the international Geomagnetic Reference Field (IGRF) from 1900 to 2000.The time variations of geomagnetic drift vector are obtained for X Y and Z componentanomalies. Z component anomaly, which illustrates best the geomagnetic drift, driftedwestward at a velocity of 0.07°/a in the 100 years. This is obviously slower than theglobal average westward drift of 0.2°/a. In addition the Z component anomaly slowlydrifted northward at a speed of 0.07°/a. Further analyses indicate that there are threestages of the drift of East Asia geomagnetic anomaly. First, the westward drift wasfast from 1900 to 1930, with an average speed of 0.10°/ a. Then, the drift changednorthwest from 1930 to 1980. The westward speed was 0.07°/a and northward speedwas 0.04°/a during this period. Finally, the drift almost stopped after 1980, and maychange eastward.
【Fund】: 国家自然科学基金!49734140
【CateGory Index】: P318.4
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