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学科主题: Geochemistry & Geophysics
题名: Weak explosion signal detection by the Beijing metropolitan digital Seismic Network
作者: Zhang, W ; Chen, QF ; Qiu, XL ; Chen, Y
通讯作者: geoscience@126.com
关键词: Beijing metropolitan digital Seismic Network ; Explosion ; Noise ; Nuclear test ; Weak signal detection
刊名: CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
发表日期: 2009
卷: 52, 期:3, 页:681-690
收录类别: sci
部门归属: [Zhang Wei] Zhejiang Univ, Dept Earth Sci, Hangzhou 310027, Peoples R China; [Zhang Wei; Chen Qi-Fu; Chen Yong] China Earthquake Adm, Inst Earthquake Sci, Beijing 100036, Peoples R China; [Qiu Xue-Lin] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
项目归属: 海洋地质
摘要: It is meaningful to use the Beijing metropolitan digital Seismic Network (BSN) of China to study deep crustal structure by recording artificial earthquakes. However, the energy released by artificial sources is small and they generally generate short-period seismic signals. In order to study the weak signal detectability of the Seismic Network between I and 20 Hz, this paper carries out the following work: (1) The analysis of background noise of BSN shows that the noise level. at seismic stations on bedrock is about 13 dB lower than that at stations located on sedimentary layer. The difference of noise level is equivalent to variations of detectable earthquake magnitude 1.0. The noise between night and day time varies by about 5 dB. There is a trend of noise level increasing year-by-year. The noise level in 2006 is 4 dB higher than that in 2001. (2) A borehole explosion experiment with 25 kg chemical charges was conducted with its energy equal to an M(L)0.69 natural earthquake. The seismic phases Pg, Pm and Pc generated by explosion can be identified at 18 seismic stations. At a permanent seismic station 218 km away, the seismic phase Pm can be detected with the peak-to-peak amplitude being about 1.6 nanometers. (3) An underground nuclear explosion carried out by North Korea in 2006 is a good opportunity to examine the weak signal detectability of the BSN. The records filtered with 1 similar to 5 Hz shows that the P or Lg waves generated by the nuclear explosion can clearly be recorded by 18 seismic stations located on bedrock. The average amplitude of P waves is 16 nanometers. The magnitude calculated is m(b)4.3, the same as that given by NEIC. The result also shows the noise level of station is one of the most important factors for signal detectability.
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WOS记录号: WOS:000265004300011
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4630
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Zhang, W; Chen, QF; Qiu, XL; Chen, Y.Weak explosion signal detection by the Beijing metropolitan digital Seismic Network,CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2009,52(3):681-690
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