上王地震台SS-Y伸缩仪在中强震前的异常特征初步分析

Preliminary Analysis of Abnormal Characteristics of SS-Y Extensometer at Shangwang Seismic Station before Moderate and Strong Earthquakes

基于关中地区上王地震台SS-Y伸缩仪观测资料,本文利用日均值、矢量图等分析方法,研究2015—2019年陕西省内Ms(面波震级)≥5.0级和国内外Ms≥6.5级的典型地震发震前形变资料所出现的短期和临震异常变化,统计异常持续时间、异常结束至发震时间,归纳异常形态特点及类型等,得出地震前形态的变化规律。分析表明,上王地震台SS-Y伸缩仪日均值形态异常对应短临地震的效果较好,矢量图异常对应中短期地震的效果较好。

Based on the observation data of SS-Y extensometer at Shangwang Seismic Station in Guanzhong area,this paper uses analysis methods such as daily average value and vector diagram to study the short-term and imminent abnormal changes of deformation data before the occurrence of typical earthquakes with Ms(magnitude of surface wave)≥5.0 in Shaanxi Province and Ms≥6.5 at home and abroad from 2015 to 2019,and counts the duration of the anomaly,the time from the end of the anomaly to the occurrence of the earthquake,summarizes the characteristics and types of the anomaly,and draws the law of changes in the shape before the earthquake.The analysis shows that the anomaly of the daily mean value of the SS-Y extensometer at Shangwang Seismic Station has a better effect on short-term and imminent earthquakes,and the vector anomaly has a better effect on mid-and short-term earthquakes.