关键词: 长城站地震台 地震观测 远震 近震 冰震

Abstract:

During the summer of 27th Chinese Antarctic scientific expedition, in order to effectively detect earthquake, we reelected the location with low noise background for the Great Wall Seismic Station to make the previous station avoid the interference sources (e.g. power generation building and cold storage). After completed the infrastructure projects (e.g. vault of seismic station and cable laying), we set up a new broadband seismograph for the station. Through the analysis of waveforms, we concluded that the new seismic station was with low background noise, stable operation and high signal to noise ratio in recordings of seismic events. The Great Wall Seismic Station will provide high-quality seismic data for relevant seismological researches in Antarctica, such as earthquake location, noise analysis, velocity structure and dynamic characteristics. Although the seismic observation time is short, the station recorded not only the teleseismic events, but also the local events and possible icequake. The results of single station location show that the distribution of 4 local earthquakes is basically parallel to the strike of South Shetland Islands, and the focal depth becomes gradually deeper from northeast to southwest.

Key words: Great Wall Seismic Station, seismological observation, Teleseismic event, local earthquake, icequake