海拉尔兰州核查地震台阵的勘址和地动噪声功率谱的计算
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摘要
根据《全面禁止核试验条约》,在海拉尔和兰州现有三分向地震台的基础上建设两个地震台阵。为此目的 ,中国地震局地球物理研究所 (IG/CSB)与全面禁止核试验条约组织国际监测系统 (CTBTO/IMS)对两个新台阵进行了勘址观测。实地勘址开始于 1 999年初。 1 999年 8月和 9月分别在兰州和海拉尔进行了勘址观测。兰州台阵阵址位于甘肃省兰州市西南 1 8km处 ;海拉尔台阵阵址位于内蒙古自治区海拉尔市东北 34km处。勘址观测仪器由 IMS提供的 6套宽频带地震计及 2 4位数据采集器组成。仪器在两个阵址分别布设于 2 0个左右的候选点进行观测 ,从兰州阵址较浅的摆坑到海拉尔阵址摆坑深至地表以下 8m。地球物理研究所与 IMS联合对数据进行了分析。结果显示两个地区大多数观测点的地噪声功率谱在高于 1 Hz的频域上均低于宽频带台站的平均值
The two primary seismic arrays will be established in China according to the Comprehensive Nuclear Test Ban Treaty.PS12(Hailar)and PS13(Lanzhou)will be upgraded from already existed three component stations to array stations.For this purpose,Institute of Geophysics,China Seismologica Bureau(IGCSB)in cooperation with the International Monitoring System(IMS)conducted site surveys of the two new arrays. The field work started in the early 1999.The site survey observations had been carried out from August to September of 1999 in Lanzhou and Hailar respectively.The first was running with location of 18 km southwest of the city Lanzhou in the Gansu Province and the second was 34 km northeast off the city Hailar in the Inner Mongolia Autonomous Region.The site survey equipment which came from IMS consisting of 6 broadband sensors(five vertical and one 3 component)with 24 bit digitizers,was deployed at near 20 candidate element sites during each site survey from shallow surface installations in Lanzhou to deep ones(up to 8 m)in Hailar. The IGCSB and IMS have jointly carried out data analysis.The results indicate that the noise power spectral density estimations have lower levels than an average broadband station at frequencies higher than 1 Hz at most sites surveyed in both regions.
The two primary seismic arrays will be established in China according to the Comprehensive Nuclear Test Ban Treaty.PS12(Hailar)and PS13(Lanzhou)will be upgraded from already existed three component stations to array stations.For this purpose,Institute of Geophysics,China Seismologica Bureau(IGCSB)in cooperation with the International Monitoring System(IMS)conducted site surveys of the two new arrays. The field work started in the early 1999.The site survey observations had been carried out from August to September of 1999 in Lanzhou and Hailar respectively.The first was running with location of 18 km southwest of the city Lanzhou in the Gansu Province and the second was 34 km northeast off the city Hailar in the Inner Mongolia Autonomous Region.The site survey equipment which came from IMS consisting of 6 broadband sensors(five vertical and one 3 component)with 24 bit digitizers,was deployed at near 20 candidate element sites during each site survey from shallow surface installations in Lanzhou to deep ones(up to 8 m)in Hailar. The IGCSB and IMS have jointly carried out data analysis.The results indicate that the noise power spectral density estimations have lower levels than an average broadband station at frequencies higher than 1 Hz at most sites surveyed in both regions.
引文
奥本海默 ,A.V.等 .数字信号处理 (中译本 ) .科学出版社 ,1 982
Brune,J.N.and J.Oliver,The seismic noise of Earth's surface.Bull Seism Soc Am49,349～ 353
Brune,J.N.and J.Oliver,The seismic noise of Earth's surface.Bull Seism Soc Am49,349～ 353
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