利用加卸载响应比分析南昌地震台垂直摆倾斜仪观测数据

对南昌地震台2008—2015年垂直摆倾斜仪观测数据分钟值进行分析,发现观测曲线有清晰的长趋势变化及年变周期特征。利用固体潮加卸载响应比分析法,对观测数据进行计算,结果显示,与台站周围震例及汶川地震有明显的对应关系,表现为明显偏离稳态值1;异常阈值Y1.3时,异常对应合理,具有显著的震前高值异常;异常的时间间隔及幅度与震级、震中距未表现出显著的比例关系,可能与发震动力过程复杂有关。

The analysis of observation data of vertical pendulum tiltmeter at Nanchang Seismic Station using loading/unloading response ratio

The data of the vertical pendulum tiltmeter of Nanchang Seismic Station from 2008 to 2015 were analyzed by using the solid tide loading/unloading response ratio analysis method. It was found that the vertical pendulum observation curve had clear long trend and annual variation. It is found that the vertical pendulum observation curve has clear long trend and annual variation. Tidal unloading response ratio and earthquakes in and around the station earthquake obvious correspondence, showed significant deviation from the steady state value of 1, the abnormal threshold Y > 1.3, the error corresponding to a reasonable, with significant high value anomalies before earthquakes. Between abnormal intervals, amplitudes and magnitude, epicenter distance, there are no significant proportion relationships, which may related to the complex dynamic processes of different earthquakes.