| A new investigation on drift of base-line value in geomagnetic observation |
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| 作者姓名： | 杨冬梅 高玉芬 赵永芬 黄蔚北 |
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| 作者单位： | DONG MEI YANG YU FEN GAO YONG FEN ZHAO WEI BEI HUANG Institute of Geophysics，State Seismological Bureau，Beijing 100081，China |
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| 摘 要： | Ａｎｅｗｉｎｖｅｓｔｉｇａｔｉｏｎｏｎｄｒｉｆｔｏｆｂａｓｅ┐ｌｉｎｅｖａｌｕｅｉｎｇｅｏｍａｇｎｅｔｉｃｏｂｓｅｒｖａｔｉｏｎＤＯＮＧ－ＭＥＩＹＡＮＧ（杨冬梅）ＹＵ－ＦＥＮＧＡＯ（高玉芬）ＹＯＮＧ－ＦＥＮＺＨＡＯ（赵永芬）ＷＥＩ－ＢＥＩＨＵＡＮＧ...
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| 收稿时间： | 29 March 1996 |
| 修稿时间： | 28 January 1997 |
A new investigation on drift of base line value in geomagnetic observation |
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| DONG MEI YANG YU FEN GAO YONG FEN ZHAO WEI BEI HUANG Institute of Geophysics,State Seismological Bureau,Beijing ,China.A new investigation on drift of base-line value in geomagnetic observation[J].Acta Seismologica Sinica(English Edition),1997,10(4):507-512. |
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| Authors: | DONG MEI YANG YU FEN GAO YONG FEN ZHAO WEI BEI HUANG Institute of Geophysics State Seismological Bureau Beijing China |
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| Institution: | (1) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China |
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| Abstract: | A new explanation on drift of base line (BL) value in geomagnetic observation was presented by means of detailed analysis on BL value of H variometer at Tianshui Observatory from 1991 to 1995, in association with some numerical simulation. It was confirmed that drift does not always exist. For variometers running normally for many years, drift appears to be zero. The temperature dependence of BL value is reversible below a certain temperature but irreversible above it. This irreversibility is the main reason that causes the BL value to show a monotonous declination with time, which has been mistaken for the drift in the past. As to the H variometer at Tianshui Observatory, no drift exists in BL value in these years. A new method was introduced to study the BL value variation with temperature by separating it into three parts. |
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| Keywords: | base line (BL) value drift temperature coefficient |
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