| 地震强度因子Mf值在华北中强以上地震前的短期异常变化 |
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| 引用本文： | 王炜,戴维乐.地震强度因子Mf值在华北中强以上地震前的短期异常变化[J].地震,1997,17(3):241-248. |
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| 作者姓名： | 王炜 戴维乐 |
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| 作者单位： | [1]上海市地震局 [2]安徽省地震局 |
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| 摘 要： | 使用华北地区１９７２￣１９９２年的中小地地震震级资料进行地震强度因子Ｍｆ值空间扫描，研究华北地区中经以上地震前的短期异常变化。结果表明，在震前０．５ａ左右的短期阶段，Ｍｆ值中期异常区存在二类不同形态的变化。其中大部分震例的Ｍｆ值中期异常区出现明显的缩小乃至消失，可将这一特征作为短期异常的标志；而另一部分震例的中期异常区无明显变化，文中讨论了Ｍｆ值用于地震预报的方法和预报效果，并对Ｍｆ值的短期变化过
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| 关 键 词： | 地震前兆 短期异常变化 地震强度因子 Mf值 |
THE SHORT-TERM ANOMALY VARIATION OF SEISMIC MAGNITUDE FACTOR M_f-VALUE BEFORE MODERATE OR STRONG EARTHQUAKES IN NORTH CHINA |
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| Wang Wei,Dai Weile, Zhou Yunhao, Yan Ping.THE SHORT-TERM ANOMALY VARIATION OF SEISMIC MAGNITUDE FACTOR M_f-VALUE BEFORE MODERATE OR STRONG EARTHQUAKES IN NORTH CHINA[J].Earthquake,1997,17(3):241-248. |
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| Authors: | Wang Wei Dai Weile Zhou Yunhao Yan Ping |
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| Abstract: | The magnitude data of moderate or small earthquake during 1972~ l992 in NorthChina are used for spatial scanning of seismic magnitude factor Mf-value in thispaper. The short-term anomaly variation before moderate or strong earthquakes is stu-died. The result shows that within the short-term, about half a year before strongearthquakes, there are two different types of variations in the mid-term anomaly zone ofMf-value. In most of earthquake cases the mid-term anomaly zone is obviously reducedor disappeared. We regard this feature as the mark of the short-term anomaly. However,in some earthquake cases the mid-term anomaly zone has no obvious variation. Theproblems of how to use the Mf-value in the short-term earthquake prediction and howwell the prediction effect is, and the qualitative physical interpretation of Mf-valueanomaly variation are also discussed. |
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| Keywords: | Weibull Distribution Short-term anomaly Seismic magnitude factor M_f-value Spatial scanning |
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