溧阳地震台gPhone连续重力仪观测数据处理与分析

选取溧阳重力连续观测台站gPhone连续重力仪2011年1月1日至2018年7月31日整点值观测数据进行预处理,对于连续性较好的2017年重力观测数据,分析其固体潮汐变化M2波潮汐因子及非潮汐变化的残差曲线特征,并以Δ<3 500 km、MS>5.0地震事件为例,检验gPhone重力仪的地震记录能力。分析认为,溧阳台gPhone重力仪观测数据日趋稳定,潮汐信号可靠,非潮汐变化的残差曲线对地震有一定程度的反应,可记录到一定范围内MS≥5.0地震的同震信号,信号记录特征与震中距及震级相关。

Data processing and analysis of gPhone continuous gravimeter observations at Liyang Seismic Station

The gPhone continuous gravimeter observation data sampled every hour on the hour during the period from 1 January 2011 to 31 May 2018 at the Liyang Seismic Station is selected and preprocessed. The observation data in 2017 has good continuity, hence it is selected to analyze characteristics of the M₂ wave tidal factor and the non-tidal residual curve. In addition, earthquakes that occurred in 2017 with an epicentral distance smaller than 3 500 km and magnitude greater than M_S 5.0 are selected here to verify the monitoring capability of the gPhone gravimeter. According to the analysis, the observation data of the gPhone gravimeter is becoming more and more stable, and the M₂ wave tidal factor and the non-tidal residual curve can reflect earthquakes to a certain degree. Observations sampled in seconds can record coseismic signals of earthquakes with M_S ≥ 5.0 to a certain range. The signal characteristics are related to epicentral distances and magnitudes.