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Weak explosion signal detection by the Beijing metropolitan digital Seismic Network
Zhang, W; Chen, QF; Qiu, XL; Chen, Y; geoscience@126.com
2009
发表期刊CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
卷号52期号:3页码:681-690
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.
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
关键词Beijing Metropolitan Digital Seismic Network Explosion Noise Nuclear Test Weak Signal Detection
学科领域Geochemistry & Geophysics
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000265004300011
引用统计
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4630
专题中科院边缘海地质重点实验室
通讯作者geoscience@126.com
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Zhang, W,Chen, QF,Qiu, XL,et al. Weak explosion signal detection by the Beijing metropolitan digital Seismic Network[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2009,52(3):681-690.
APA Zhang, W,Chen, QF,Qiu, XL,Chen, Y,&geoscience@126.com.(2009).Weak explosion signal detection by the Beijing metropolitan digital Seismic Network.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,52(3),681-690.
MLA Zhang, W,et al."Weak explosion signal detection by the Beijing metropolitan digital Seismic Network".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 52.3(2009):681-690.
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