琼中地震台连续重力显著异常分析

The significant anomaly analysis of continuous gravity observation at Qiongzhong Seismic Station

2014年以来,琼中基准地震台连续重力观测数据出现较为显著的零漂转折加速和数据放大异常。经仪器观测系统检查、台站观测环境调查、数据分析等核实操作,分析认为:(1)零漂转折加速异常系观测环境影响所致;(2)数据放大异常系网络数据采集器故障所致。因此,2次异常均非地震地球物理异常。此类异常干扰判别可为其他重力台站观测数据分析提供参考。

Since 2014, the continuous gravity observation data at Qiongzhong Seismic Station has been experiencing two significant abnormalities, one is zero-drift overturn acceleration anomaly, the other is data amplification anomaly. After checking the instrument observation system, investigating the observation environment of the station, and analyzing data, we considered that the first abnormality was caused by the observation environment. After analyzing the abnormally amplified data, we considered the second abnormality was caused by a network data collector failure. Therefore, these two anomalies were not earthquake precursor anomalies. Such anomalies may appear in the observation data of other gravity stations, so the reasons for these two kinds of anomalies have certain reference significance.