| 近12000年以来北京地区地球磁场变化机理探讨 |
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| 引用本文： | 朱日祥,刘青松,郭斌.近12000年以来北京地区地球磁场变化机理探讨[J].地球物理学报,2001,44(2):211-218. |
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| 作者姓名： | 朱日祥 刘青松 郭斌 |
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| 作者单位： | 中国科学院地质与地球物理研究所,北京 100101 |
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| 基金项目： | 国家自然科学基金!项目 ( 494 2 540 5)，中国科学院重大项目! (KZ951 -A1 -4 0 1 ) |
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| 摘 要： | 距今12000年以来北京地区地球磁场长期变化由长周期(大于1000年)和短周期(约500年)两部分组成，长周期和短周期分量分别受控于漂移场和稳定场的变化.与日本地区相比，北京地区地球磁场最显著的特征是在距今(5110-4670)±110年之间曾发生短极性漂移事件，这样的短极性地磁事件可能与地球外核流体运动的异常变化有关.
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| 关 键 词： | 北京 地球磁场长期变化 地磁漂移 地球磁场变化机理 |
| 文章编号： | 0001-5733(2001)02-0211-08 |
| 收稿时间： | 2000-05-25 |
PRELIMINARY STUDY ON THE MECHANISM OF THE GEOMAGNETIC SECULAR VARIATIONS IN BEIJING OVER THE LAST 12000 YEARS |
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| ZHU RI-XIANG,Liu Qing-song,GUO BIN.PRELIMINARY STUDY ON THE MECHANISM OF THE GEOMAGNETIC SECULAR VARIATIONS IN BEIJING OVER THE LAST 12000 YEARS[J].Chinese Journal of Geophysics,2001,44(2):211-218. |
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| Authors: | ZHU RI-XIANG Liu Qing-song GUO BIN |
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| Institution: | Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100101,China |
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| Abstract: | The paleomagnetic secular variation (PSV) in Beijing over the last 12000 years can be divided into long-term (＞1000 years) and short-term (500-1000 years) components. The long-term variations are mainly controlled by changes in the drifting field, while the short-term variations are most probably caused by the fluctuation of the standing field. Comparing to the PSV in Japan, a remarkable feature in Beijing is a short geomagnetic excursion occurring between (5110-4670)±110 years,which might be related with the anomaly movement of the fluid in the Earth's outer core. |
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| Keywords: | Beijing Anisotropy of magnetic susceptibility Paleomagnetic secular variation Geomagnetic excursion |
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