莆田台砂层应变东西分量映震特征浅析

Analysis of Earthquake Reflecting Characteristic of EastWest Component of Sand Strain in Putian Station

通过整理分析莆田砂层应变观测数据,并将其与全国7.0级以上、福建3.5级以上和台湾5.0级以上地震前的变化规律进行对比,结果表明:东西分量观测数据在上述地震前,特别是对于福建地区的地震,有多次震前日变动态出现畸变,而北南分量和平行断层分量在震前并无明显异常,结论可为今后分析该区及周边地震活动提供判定依据,并将其应用到地震预测之中,具有一定的指导意义。

Based on the observation data of sand strain in Putian station,the paper analyzes its variation before and after the national earthquakes with M≥7.0,the earthquakes in Fujian with M≥3.5,and the earthquakes in Taiwan with M ≥5.5. The results show that the east-west component of observation data,especially for the earthquakes in Fujian area,has distortion of the diurnal dynamic before the earthquakes for many times,but the north-south component and the component paralleling to the fault has no obvious abnormalities before the earthquakes. The paper can provide the decision basis for seismic activity analysis of the region and the adjacent in future,and also has certain guiding significance for earthquake prediction.