琼中台连续重力观测记录地震特征分析

The signature of seismic events recorded by the continuous gravimeter at Qiongzhong seismic station

利用以琼中台为圆心,半径为3 500km范围内2009—2014年MS≥2.0地震目录资料,统计分析琼中台连续重力观测数据曲线与地震的对应情况,并对有关震例在连续重力原始秒数据曲线中产生的地震波进行特征分析,总结规律,得出琼中台连续重力观测对震中距3 500km以内地震的记录能力。同时分析了地震事件对重力观测数据、潮汐和非潮汐参数的影响,认为地震不仅在重力观测数据曲线上产生脉冲或阶跃,在非潮汐重力残差曲线上也会产生脉冲,而对重力M2波潮汐因子产生的影响较小。

In this paper, we used the earthquake catalog（Msv2.0） from 2009 to 2014 within 3 500 km away from the Qiongzhong seismic station to analyze statistically the correla tion between the continuous gravity observation data recorded by Qiongzhong station and earthquakes. By investigating the characteristic of the seismic waves generated by earthquakes in the original second consecutive gravity data, we get the capabilites of Qiongzhong continuous gravity observation to record the earthquake within 3 500 kin. At the same time, we ana lyze the influence of earthquakes to the gravity observation data, tidal and non-tidal data parameters. It is considered the earthquakes not only give rise to a pulse or step on the gravity observation data, but also on a non-tidal gravity residual curve, and cause little influence on the gravity M2 tidal factor.