对1989年大同─阳高6．1级地震的思考

通过研究提出，第４地震活动期开始到现在，山西地震带的地震活动处于主要参与地位。大同－阳高６．１级地震属调整阶段的地震。在本活动期内大同盆地内再发生６级以上地震的可能性不大。渭河等盆地的低水平活动状态，是强震源解体后低应力闭锁状态的反映，有别于高应力闭锁状态的空区或空段。根据１９７６年后华北地震区地震活动的动向分析，指出山西地震带可能是调整阶段中强地震活动的主要场所之一。

Ponderation over 1989 Datong-Yanggao Earthquake

From the beginning of the fourth active period till now,the seismicity of Shanxi zone is dominant. Da-tong-Yanggao M6.1 earthquake belongs with the earthquake of the adjustment stage. The possibility whichM> 6. 0 earthquake will occur in Datong basin within the active period is not great. The low active state ofWeihe basin and other basins is the low stress blocking state after decomposition of the strong eartbquakesource,and is different from the gap or unoccupied segment of the high stress blocking state. The paper sug-gests that Shanxi seismic zone might be one of the most probably candidates for strong earthquake occurringwithin the adjustment stage.