| 60年代末与70年代末中国4个地磁台处Jerk的分析 |
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| 引用本文： | 陈伯舫.60年代末与70年代末中国4个地磁台处Jerk的分析[J].地球物理学报,1998,41(1):71-78. |
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| 作者姓名： | 陈伯舫 |
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| 作者单位： | 香港大学物理系,国家地震局地球物理研究所,北京,100081 |
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| 摘 要： | 外场的影响可以通过一定的方法从地磁月均值中消除,本文用通日月均值资料分析了广州、余山、兰州和北京的Jerk的大小．结果显示,上述4台的X和Y分量都存在二次寻数阶跃．Z分量上Jerk不明显,只有兰州和北京台较易看出60年代末的Jerk．由于本文结果是尽量消除外场影响后的结果,又是中低纬度地区的结果,所以作者认为它可支持Jerk是源于地核的推论,而且认为应将60年代末的Jerk与70年代末的Jerk一并研究．
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| 关 键 词： | 地磁长期变化 加速度阶跃 中国地区地磁台 |
| 收稿时间： | 1996-12-23 |
FEATURES OF THE LATE 1960'S JERK AND THE LATE 1970'S JERK AT FOUR OBSERVATORIES IN CHINA |
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| CHEN BO-FANG.FEATURES OF THE LATE 1960'S JERK AND THE LATE 1970'S JERK AT FOUR OBSERVATORIES IN CHINA[J].Chinese Journal of Geophysics,1998,41(1):71-78. |
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| Authors: | CHEN BO-FANG |
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| Institution: | Physics Department, University of Hong Kong, Hong Kong; Institute of Geophysics,State Seismological Bureau, Beijing 100081, China |
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| Abstract: | The external geomagnetic disturbing fields can be removed from the monthly means by the use of a deterministic approach. Using this method we analyzed the monthly means data of Guangzhou, Sheshan, Lanzhou and Beijing for determining the magnitudes of geomagnetic Jerks. The results show that step-changes do exist in the secular acceleration at the X and Y components for these observatories. However, the appearence of the Jerks at the Z component is not evident only the late 1960's Jerks can be distinginshed at the Lanzhou and Beijing observatories. Since the results in the present study are obtained by the method for removing a great part of external source influences and indicate the features of the Jerks for the region of mid-and lowlatitudes, the writer believes that these results give support to the conclusion -Jerk is of internal origin. Furthermore, the writer suggests that the late 1960's Jerk should be studied together with the late 1970's Jerk. |
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| Keywords: | Geomagnetic secular variation "Jerk' Geomagnetic observatories in the Chinese region |
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