唐山古冶、 滦县地区中小地震活动与构造关系研究

小震活动与断层运动紧密相关, 小震定位技术已逐渐成为地震断层破裂、 发震构造研究中不可或缺的手段。 本文采用双差定位法对唐山地区1978—2011年内发生地震进行重新定位, 以地震学与构造地质学为理论基础, 着眼于唐山地震构造系统与滦县地震构造系统的交汇区, 对连续、 丰富的地震数据进行时间、 空间综合分析, 发现古冶东侧出现一条新生地震带。 开滦煤矿地质资料证实了该新生地震带展布与徐家楼—王喜庄基岩断层完全重合, 推测2010年M_S4.2地震与2012年M_S4.8地震均由徐家楼—王喜庄断层活动引起, 应加强该区地震监测工作。

Relationship between Tectonics and Small to Moderate Earthquakes in Guye and Luanxian area,Hebei Province

Small earthquake activity is closely associated with fault movement, and small earthquake location method is commonly used for earthquake fault rupture and seismogenic structure research. Using double difference algorithm, earthquakes occurred from 1978 to 2011 are relocated. On the basis of seismology and active tectonics, focusing on Tangshan earthquake tectonic system and Luanxian earthquake tectonic system, we discover a new earthquake belt in the east of Guye area through the spatial-temporal analysis of the plenty of consecutive small earthquakes, and we speculate there exists a deep fault of NNE-striking, which is coordinated with the linear feature and coal seams distribution features. The speculated fault coincides with the Xujialou fault from the coal field geological exploration data, which is considered to trigger the M_S4.2 and M_S4.8 earthquakes in the past 3 years. We suggest the earthquake monitoring on this region should be strengthened and active tectonic research about the speculated fault should be carried out.