Analysis and Optimization Strategy of Background Noise at Qinhuangshan Station Based on Comparative Observation

The stations of the Shanghai Seismic Network play a important role in earthquake monitoring and rapid reporting. However, the background noise of Qinhuangshan Seismic Station is relatively high, severely affecting the accuracy of seismic fundamental parameter determination. To further explore the reasons for the high background noise, a comparative observation system was set up in the Qinhuangshan cave, analyzing multiple dimensions such as waveform data availability, seismic recording capability, and base background noise compared with the original station. The research results show that the background noise at the Qianghunshan seismic station is relatively high, primarily attributable to the amplification effect caused by the cavity within the tunnel structure. The background noise of the cave station is significantly reduced, seismic phases are clear, the signal-to-noise ratio is high, and the data availability is higher, making it more significant for earthquake monitoring, rapid reporting as well as scientific research.