摘要
2015年9月14日河北昌黎发生M_(S)4.2地震,收集整理易县地震台四分量钻孔应变仪观测数据,基于面应变和切应变视角进行分析,发现二者在震前出现异常变化,且2组面应变相关系数在震前数天即出现异常,该异常或可作为中小地震前应力应变异常识别的信息之一。
On September 14,2015,an M_(S)4.2 earthquake occurred in Changli,Hebei Province.The observation data of the four-component borehole strain gauge at Yixian Seismic Station were collected and analyzed from the aspects of surface strain and shear strain.It was found that they had abnormal changes before the earthquake,and the two groups of surface strain correlation coefficients showed anomalies several days before the earthquake.This anomaly may be one of the information for identifying stress-strain anomalies before small and medium earthquakes.
作者
赵慧琴
ZHAO Huiqin(Baoding Central Seismic Station,Hebei Province 071000,China)
出处
《地震地磁观测与研究》
2021年第4期127-132,共6页
Seismological and Geomagnetic Observation and Research
基金
河北地震科技星火计划面上项目(项目编号:DZ20170509033)。
关键词
四分量钻孔应变仪
昌黎M_(S)4.2地震
面应变
切应变
相关系数
four-component borehole strain gauge
Changli M_(S)4.2 earthquake
surface strain anomaly
shear strain anomaly
the correlation coefficient
