摘要
通过对强震前数年内一定震级档次内的地震活动进行分析 ,提出一个刻划地震孕育过程进入中短期阶段的指标— Cr值。它可以反映岩石本构关系曲线峰值点附近的状态。在对 7次 7级左右强震进行震例研究表明 ,震前 Cr值出现明显高值异常。Cr值达最高值的时间超前地震发生 1～ 3a,多数是在 1 a左右 ,这对中短期地震预报有意义。
A new norm, Cr value which could mirror the seismogenic process entering the mid short term phase, is proposed by the analysis of the seismicities with a certain magnitude level occurring several years prior to strong earthquakes. It could reflect the state around the peak point of the constitutive relation curve. The results of seven earthquake cases with magnitude about 7 show that the Cr value is unusually high before the earthquakes. These strong earthquakes occurred 1～3 years after the maximum value of Cr emerged, and most about 1 year. It will be beneficial to the mid short term earthquake prediction.
出处
《地震》
CSCD
北大核心
1998年第2期127-133,共7页
Earthquake
基金
国家地震局"九五"攻关项目资助 (95 -0 4-0 6-0 1 )
关键词
中短期预报
强震
地震预报
铬值
预报指标
Mid short term prediction, Strong earthquakes with magnitude of about 7, The Cr value
