山西地区M≥7强震前的地震活动基本图像

Principal Seismicity Pattern before M ≥7 0 Strong Earthquake in Shanxi Area

利用“八五”研究课题的成果，分析了山西Ｍ≥７强震前的地震活动图像，指出一次Ｍ≥７强震前将经历如下过程：４～５级中等地震活动迅速增多；出现辅助性地震条带和背景性地震空区；地震序列密集活动并伴随应变释放加速；发生广义前震—平静—发震。

The seismicity pattern before M ≥7.0 strong earthquake in Shanxi area had been analyzed by the results of the research subject of the Eighth Five Year Plan,the author suggested that the activity increasing of M 4～5 earthquakes,the subsidiary seismic strip and background seismic gap,the concentrating seismicity with increasing strain release,the generalized foreshock and the quiescence would occur before a M ≥7.0 strong earthquake.The evolutionary process is the principal seismicity pattern before M ≥7.0 strong earthquake in Shanxi area.