江苏溧阳测震台抗干扰措施效能分析

Anti—interference Measures and Efficiency Analysis of Jiangsu Liyang Seismic Station

2018年长山路通车对江苏溧阳测震台观测环境造成了干扰,相关部门分别在2018年6月和2019年5月采取了设置长山路限速限重标识和运行新井下测震观测系统2项抗干扰措施。本文通过对2项抗干扰措施效能定量计算和分析发现:设置限速限重标识后老测震井的台基背景噪声和功率谱密度曲线数据质量明显好转;新井下测震观测系统的台基背景噪声、功率谱密度曲线和地震监测能力均落后于老测震观测系统,分析原因可能与设备质量和安装工艺有关。

The use of the Changshan road in 2018 has caused interference to the observation environment at the Liyang station.In June 2018 and May 2019,the relevant departments set up the speed limit and weight limit signs at the Changshan road.A new underground seismic observation system was establised.Through the quantitative calculation and analysis of the effectiveness of the two anti-interference measures,we found that the data quality of the background noise and power spectral density curve of the old well foundation was improved obviously when the speed limit and weight limit signs were set.The background noise,power spectral density curve,and seismic monitoring capability of the new underground seismic observation system are weaker than those of the old seismic observation system.We suggest that equipment quality and installation technology might be relatively low.