河南淅川M_L 4.6地震序列特征及发震诱因初探

2018年2月9日河南淅川发生M_L4.6地震序列,震中位于丹江口水库库区,依据有关地震序列判别规则和地震学分析方法,分析认为此次地震序列非前震序列,属主余型地震,后续无更大地震发生。2017年11月丹江口水库蓄水位首次达167 m,3个月后即发生此次M_L4.6地震序列,通过丹江口水库水位与地震的相关性,分析认为具有较明显的水库地震特征。

Preliminary study on earthquake sequences and causes of the ML 4.6 earthquake in Xichuan,Henan Province

On February 9, 2018, an earthquake sequence with an M_L 4.6 mainshock occurred in Xichuan, Henan Province. The epicenters are in Danjiangkou reservoir area. Based on the partitive mark of the earthquake sequence and the method of seismological analysis, this paper analyzes the sequence. It is considered that the earthquake sequence belongs to the main-aftershock type and does not a foreshock sequence, and no larger earthquakes occur in the follow-up. The water level of the Danjiangkou reservoir reached 167 metres in November 2017 for the first time and the earthquake sequence occurred three months later. Analysis of the correlation between the water level of the Danjiangkou reservoir and the earthquake sequence in Xichuan shows that the earthquake sequence has obvious characteristics of reservoir-induced earthquakes.