摘要
利用调制地震方法对华北地区１９７３年以来发生的２４个ＭＬ≥５．５地震前地震调制比、地震调制比异常面积、调制地震条带和调制地震频度的异常变化进行分析，对异常类型进行分类。分析结果认为，华北地区ＭＬ≥５．５地震前地震调制比和异常面积随时间进程的起伏、调制地震频度震前数月的突然增大以及调制地震条带异常图象是显著的异常变化，可以用于对中。
The anomalous variation of modulation ratio and its anomalous area, and the stripes and frequency of modulated earthquakes prior to 24 M L≥5.5 earthquakes, which occurred in North Chinese area since 1973, has been analyzed using the modulated earthquake method, and the relevant anomalous types have been classified. It is concluded that the fluctuations of modulation ratio and its anomalous area with time, the abrupt increase of the frequency of modulated earthquakes several months earlier and the anomalous stripes of modulated earthquakes are significant anomalies prior to the occurrence of a M L≥5.5 earthquake in north Chinese area, which can be applied to the medium term prediction of moderate earthquake.
出处
《地震学刊》
CSCD
1999年第2期10-16,共7页
Journal of Seismology
基金
中国地震局"九.五"攻关合同制项目资助课题
