胶东半岛小震丛集特征研究

Study on the Characteristics of Small Earthquake Clustering in Jiaodong Peninsula Area

以最邻近事件距离算法为基础,结合混合概率密度分布对胶东半岛地区的小震丛集特征进行分析。结果表明:1)该地区存在明显的地震成丛现象,且近年来丛集率显著提高;2)乳山震群和莱州地震前,半岛地区均存在b值降低和丛集率升高的现象。分析认为,低b值异常配合高丛集率可能是该区域地震活动较好的预测指标。

Based on the nearest-neighbor distance algorithm, we analyze the clustering characteristics of small earthquakes in Jiaodong peninsula area using the mixture probability density function. The results show that: 1) The phenomenon of earthquake clustering is very obvious in this area, and the clustering rate has increased significantly in recent years. 2) b value decreased and clustering rate increased in Jiaodong peninsula area before the Rushan earthquake swarm and the Laizhou earthquake. Therefore, the coexistence of low b value and high clustering rate is a good predictor of seismicity in this area.