Influence of sandstorm weather on environmental background noise of the seismic stations in western Nei Monggol
In order to further study the impact of sandstorm weather on the background noise of seismic stations,and improve observation quality,we take the sandstorm event in Alashan League from 17:00 on March 14,2021 to 20:00 on the next day as an example.We select data from 2 surface observation stations and 2 cave observation stations in the western part of the Nei Monggol.We capture 24-hour continuous waveform of this sandstorm event and sunny weather,using the Welch method to calculate the root mean square RMS and power spectral density PSD values.This analysis reveals the characteristics of interference caused by sandstorms on the ambient noise levels of seismic stations.The results show that:① In frequency bands below 0.1 Hz,2-4 Hz,and 10-20 Hz,sandstorm weather has significant interference on the ambient noise of seismic stations.Specifically,rapid cooling is distributed in the frequence band below 0.1 Hz,the strong winds is distributed in the frequence band 2-4 Hz band,and dust and sand storms is distributed in the frequence band 10-20 Hz band.In the surface observation stations(WLJ,EKH),it shows the stepped characteristics.② Temperature change are likely the primary factor affecting long-period seismic signals.The rapid cooling during sandstorms significantly impacts the 0.1 Hz frequency band.③ Observation caves with good constant temperature and humidity and wind protection effect are less affected by sandstorms,which can significantly reduce the impact of environmental disturbance events on the quality of seismic observation data.
sandstormenvironmental background noisewestern Nei Monggolsurface observation stationcave observation station
万方数据
维普
