地震前超宽频带地脉动记录异常变化特征探讨

Discussion on the Characteristics of Abnormal Changes in Ultra-Wideband Ground Pulsation Records Before the Earthquake

研究表明地脉动在大地震发生前常表现出异常变化。对灯塔M5.1、科尔沁M5.3及前郭震群(M≥5.0)等地震前沈阳地震台JCZ-1T超宽频带地震计的地脉动数字记录进行频域分析,通过大量多组不同频段的频域对比,确定了上述地震前沈阳地震台地脉动在0.2~0.5Hz频段有异常变化现象。利用振幅值作为指标绘制了地震前后的指标日变化曲线图,并分析了这些地震前沈阳地震台超宽频带地脉动记录的异常变化特征。文末简单讨论了该类研究对于临震预报的潜在价值。

Studies have shown that ground pulsations often show abnormal changes before major earthquakes occur.Frequency domain analysis of the ground pulsation digital records of the Shenyang Seismic Station JCZ-1T ultra-wideband seismometer before the Dengta M5.1,Kerqin M5.3,and Qianguo earthquake swarms(M≥5.0)earthquakes.According to the frequency domain comparison,it was confirmed that there was an abnormal change in the ground pulsation of the Shenyang Seismic Station during the 0.2~0.5 Hz frequency band before the earthquake.Using the amplitude value as an indicator,the daily variation curves of the indicators before and after the earthquake were plotted,and the characteristics of the anomalous changes of the ultra-wideband ground pulsation records of the Shenyang Seismic Station before these earthquakes were analyzed.At the end of the article,the potential value of this type of research for earthquake prediction is briefly discussed.