郯庐断裂带南段加卸载响应比变化特征分析

本文对郯庐断裂带南段开展了分段加卸载响应比变化研究，总结了区域内显著地震前加卸载响应比时序曲线的变化特征。研究表明，加卸载响应比表征了地下介质的损伤程度，具有明确的物理意义，在实际应用中取得了较好的效果。在中小地震较为丰富的研究区域，加卸载响应比在显著地震前会出现短临高值异常; 而在中小地震活动水平不高的区域，加卸载响应比在震前更多地表现为长期的背景高值异常。

Variation Characteristics of Load-unload Response Ratio in the Southern Tanlu Fault Zone

In this paper, we studied the variation of load-unload response ratio (LURR) in the southern Tanlu fault zong, and summarize the timing curve characteristics before some significant earthquakes in this area. The results reveal that the load-unload response ratio, which represents the extent of the subsurface damage, has a clear physical meaning and can give good results in practical applications. It was found that LURR has short-term high value anomaly before some significant earthquakes in the areas of high seismic activity level of medium and small earthquakes. However, LURR mainly shows long-term background high value anomalies in other areas.