| 中国西北地区强震前地磁短期异常特征分析 |
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| 引用本文： | 张苏平.中国西北地区强震前地磁短期异常特征分析[J].西北地震学报,1999,21(1):15. |
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| 作者姓名： | 张苏平 |
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| 作者单位： | ：中国地震局兰州地震研究所，甘肃
兰州 730000) |
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| 摘 要： | Analysing
characteristics of geomagnetic anomalies before MS≥5 earthquakes in recent
years in Gonghe basin and at middle east section of Qilian mountains and space-time
distribution of the anomalies,geomagnetic short-term prediction indexes before strong
earthquakes in northwestern China are studied.The results indicate that various degrees of
anomalies of magnetic storm,geomagnetic low-value displacement and correlation
coefficients of geomagnetic vertical component between stations appeared before strong
earthquakes.Interval from beginning of geomagnetic low-value displacement anomalies to
origin time is 10～40 days.Interval from magnetic storm to origin time is three days
before and after the dates which are multiple of nine.Coming earthquakes are located at
near line of demarcation of the low-value displacement anomalies,or in the anomalous
area.If duration of the correlation coefficient anomalies is over 5 months,it is possible
that MS≥5 earthquake occurs in anomalous area.
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| 文章编号： | 1000-0844(1999)01-0078-06 |
| 修稿时间： | 1997-10-21 |
ANALYSIS ON CHARACTERS OF
GEOMAGNETIC SHORT-TERM ANOMALY BEFORE STRONG EARTHQUAKES IN NORTHWESTERN CHINA |
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