摘要
本研究报告通过1980年7月至1987年10月冀豫环地磁场总强度野外测点与邯郸测站观测成果的对比差δF1_(i,j)~′,进行资料可靠性判别、滑动平均值δF2_(i,j)~′,改正,对其差值δF3_(i,j)~′与测区附近的1981年11月9日河北隆尧5.8级、1983年11月7日山东菏泽5.9级和l 985年11月30日河北任县5.3级三次中强地震分析对比,还分析了Ms<5和Ms≥5地震前后的地磁变化。探讨了识别地磁变化异常的判别指标和定性判别短期(三至四个月左右)近区(地磁趋势变化异常测点附近数十公里左右)中强(Ms为接近6级)地震的预报指标,为拟定地磁趋势变化异常预报地震方法提供了依据。研究结果是初步的,有待于今后进一步观测研究和预报实践检验。
Based on contrast differences δF1ij' between observed results of the field stations of the total intensity around geomagnetic fields in Hebei and Henan provinces and Handan station from July 1980 to October 1987, this paper discriminated the reliability of data, corrected the sliding average value 8F2ij', analysed and compared the difference value δF3i'j of three moderate earthquakes around the studied area, namely Longyao M5.8 earthquake, Hebei Province, Nov. 9,1981, Heze M5.9 earthquake, Shandong Province Nov. 7,1983 and Renxian M5.3 earthquake, Hebei Province, Nov. 30,1985, and also analyzed geomagnetic variations around MS < 5 and Ms≥ 5 earthquakes. The discriminant index for recognizing geomagnetic variation anomaly and qualitative discrimination of prediction index of moderate earthquakes(Ms ~ 6) in the vicinity (about tens km from the stations of the anomaly geomagnetic tendency changes) in a short period (about 3-4 months) were discussed, provided evidence for drawing up the predicting earthquake methods of geomagnetic tendency variation anomalies. The research result is preliminary and needs further observation and research as well as examination of prediction practice.
出处
《地震》
CSCD
北大核心
1991年第4期29-34,共6页
Earthquake
基金
地震科学联合基金会
