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第27次南极科考度夏期间长城站地震观测

【标题】第27次南极科考度夏期间长城站地震观测

【Title】SEISMOLOGICAL OBSERVATION AT THE GREAT WALL STATION DURING THE 27TH CHINESE ANTARCTIC EXPEDITION IN THE SUMMER

【DOI】10.3724 /SP.J.1084.2012.00095

【作者】 常利军; 丁志峰; 孙为国

【Author】

【期刊】极地研究

【Journal】

【期刊年份】2012

【卷】24

【期】1

【关键词】 长城站地震台 地震观测 远震 近震 冰震

【Keywords】 Great Wall Seismic Station, seismological observation, Teleseismic event, local earthquake, icequake

【摘要】在第27次中国南极科学考察度夏期间,针对长城站原地震台受干扰源(如发电栋、冷库)的影响,对台站进行了重新选址工作,并完成了新台站的基建工程(摆坑、电缆布设等),架设了一套宽频带地震仪。对新台站记录的数据进行分析表明新台站运行稳定,背景噪音小,记录的地震事件信噪比高,这为下一步开展相关地震学方面的研究将提供高质量的数据。尽管本次科考地震观测时间短,但是新台站不仅观测到了远震记录,而且观测到了长城站附近地区的近震和疑似冰震的记录。单台定位结果显示4次近震分布基本与南设得兰群岛走向平行,且震源深度由东北向西南逐渐变深。

【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.

【基金/项目】 中国地震局地球物理研究所基本科研业务专项 ; 鄂尔多斯块体及周缘壳幔各向异性研究

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