摘要
通过对华东地区1990年以来5次中强以上地震震前异常变化的综合分析,探讨了b值,Ds,Dt,C(n)值,YH值,Σ(t)值震前异常形态,并归纳出华东地区中强地震发生前测震学中短期异常的综合判据:YH值高值异常(主要出现在震前3年前后)—b值低值异常(平均出现在震前2年前后)—C(n)、YH值低值异常(大体出现在震前1～2年前后)—Ds,Dt值低值异常、Σ(t)值低值异常、b值高值异常(主要出现在震前1年内或稍长)—发震的模式。
By synthetically analyzing the variation characteristics of pre earthquake anomaly before five moderate strong earthquakes in East China since 1990,discussing the pre earthquake anomalous shape of b value and so on we obtained the comprehensive criteria for medium and short term earthquake anomaly before moderately strong earthquake in East China:high YH value anomaly—low b value anomaly—low C(n) and YH value anomaly—low D s and D t and Σ( t ) value anomaly and high b value anomaly—earthquake.
出处
《地震地磁观测与研究》
2000年第1期22-28,共7页
Seismological and Geomagnetic Observation and Research
