巴彦浩特石英水平摆倾斜仪地震地球物理短临异常分析

Analysis of short-term and imminent anomalies of seismic geophysics of Bayanhot quartz pendulum tiltmeter

收集并整理2015-2022年巴彦浩特地震台石英水平摆倾斜仪观测资料,选取典型震例,结合观测区域内地震孕育特点,运用小波分析理论方法,系统分析该台地震地球物理短临异常。结果表明,在地震发生前一段时间内,巴彦浩特地震台石英水平摆倾斜仪NS分量固体潮出现倾斜、阶变、突跳、畸变、扰动变化特征,表明石英水平摆倾斜仪观测数据短临异常映震效果较好,异常持续时间、大小与震级和震中距大小具有相关性,可对阿拉善盟及周边地区形变观测仪器震前短临异常分析提供有效参考。

By collecting and arranging the observed data of the Bayanhot quartz pendulum tiltmeter from 2015 to 2022,using the theory of wavelet analysis,selecting typical earthquake cases,and combining the characteristics of earthquake preparation in the observed area,the short-term and imminent anomalies of the precursor of quartz horizontal pendulum tiltmeter in Bayanhot earthquake are analyzed systematically.The analysis results show that the observed data of the quartz pendulum tiltmeter at Bayanhot Seismic Station have obvious short-term and imminent anomalies for typical earthquake cases;the specific features are tilting,step change,abrupt jump,distortion,and disturbance of the north-south component in a time before the earthquake.Through analysis and demonstration,it is concluded that the short-term and imminent anomaly of the observed data of the Bayanhot quartz pendulum tiltmeter is better than the short-term anomaly,and the duration and size of the anomaly are related to the magnitude and epicenter distance of the earthquake.It can provide an effective reference for the analysis of short-term and imminent anomalies of precursory instruments in the Alxa League and its surrounding areas.