等烈度线是地面上各相同烈度点的连线。等烈度线图绘出了地震影响的总轮廓，为人们进行震灾评估、部署抗震救灾和发放救灾物资提供了科学依据。
伽师强震群的破裂断层面为北东向，与震源深度梯度变化带、地壳接触变形梯度变化带、等烈度线以及地震扩展方向吻合；
The rupture surface is to NNE, similar to gradient belt of focal depth, gradient belt of crustal deformation, isoseisms and extended direction of earthquakes.
本文利用山东省及其邻区14个地震的37条等震线拟合山东地区地震烈度衰减公式。
The formula of seismic intensity attenuation fitted by using 37 isoseismal lines of 14 earthquakes in Shandong and near area.
在重新整理烈度、距离等参数的同时，认为取两等震线的中心线比取烈度的外包线更合理。
When reanalyzing the parameters for intensity and distance, it iS considered that taking the central line of the two isoseismic is more reasonable than taking the outer envelop of the intensity.
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