许智, 封弼君. 大同-阳高Ms6.1级地震地磁场异常变化分析[J]. 华北地震科学, 1990, 8(4): 90-98.
引用本文: 许智, 封弼君. 大同-阳高Ms6.1级地震地磁场异常变化分析[J]. 华北地震科学, 1990, 8(4): 90-98.
Xu Zhi, Feng Bijun. ANALYSIS ON THE GEOMAGNETIC FIELD ANOMALOUS VARIATION OF DATONG YANGGAO MS6.1 EARTHQUAKE[J]. North China Earthquake Sciences, 1990, 8(4): 90-98.
Citation: Xu Zhi, Feng Bijun. ANALYSIS ON THE GEOMAGNETIC FIELD ANOMALOUS VARIATION OF DATONG YANGGAO MS6.1 EARTHQUAKE[J]. North China Earthquake Sciences, 1990, 8(4): 90-98.

大同-阳高Ms6.1级地震地磁场异常变化分析

ANALYSIS ON THE GEOMAGNETIC FIELD ANOMALOUS VARIATION OF DATONG YANGGAO MS6.1 EARTHQUAKE

  • 摘要: 对大同-阳高Ms6.1级地震前1986~1989年9月河北省及其邻区流动地磁测量和有关的台站观测资料进行了对比分析后,认为地震前流动地磁所测1989年张家口、怀来等测点的较大偏离可能是由于测量方式本身的限度和外场的不均匀造成的,因此将其作为震前异常变化是不适当的。对这些资料进行了计算处理,对所求出的相对完县的平均年变率进行了2次多项式趋势面分析。分析结果表明在大范围正常趋势变化的背景上以大同-阳高Ms6.1地震为中心存在一个负值偏差区,这可能和震前应力场作用下的地磁场的变化有关。

     

    Abstract: After the comparative analysis to the data of the geomagnetic moving survey and the correlative station observation in Hebei province and its vicinity in 1986-1989 September before Datong-Yanggao Ms6.1 earthquake, it is considered that the bigger deviations measured by geomagetic moving survey at Zhangjiakou, Hualai, etc, in 1989 before the earthquake may be owing to the limitation of the surveying way itself and the inhomogeneous of the external field, Therefore, it is not suitable to regard it as the preearthquake anomalous variation. Calculation have been made to the data, and the quadratic multinomial tendency sulface analysis is conducted to the calculated mean annual variation rates relative to Wanxian. The analysis result suggests that on the background of normal variation in a large scale, there is a negattive deviation area, centered at the epicenter of Datong-Yanggao Ms 6.1 earthquake, this may be correlated to the geomagnetic field variation caused by the stress field before the earthquake.

     

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