DOI: 10.1029/2012GL054329
论文题名: Coherent ambient infrasound recorded by the International Monitoring System
作者: Matoza R.S. ; Landès M. ; Le Pichon A. ; Ceranna L. ; Brown D.
刊名: Geophysical Research Letters
ISSN: 0094-9376
EISSN: 1944-9107
出版年: 2013
卷: 40, 期: 2 起始页码: 429
结束页码: 433
语种: 英语
Scopus关键词: Anthropogenic activity
; Broad frequency range
; Correlation algorithm
; Detection probabilities
; Function of frequency
; International monitoring systems
; Recording environment
; Signals of interests
; Acoustic noise
; Frequency bands
; Nuclear explosions
; Power spectral density
; Signal detection
; algorithm
; ambient noise
; atmospheric pollution
; frequency-magnitude distribution
; human activity
; infrasonics
; nuclear explosion
; signal-to-noise ratio
; waveform analysis
英文摘要: The ability of the InternationalMonitoring System (IMS) infrasound network to detect atmospheric nuclear explosions and other signals of interest is strongly dependent on stationspecific ambient noise. This ambient noise includes both incoherent wind noise and real coherent infrasonic waves. Previous ambient infrasound noise models have not distinguished between incoherent and coherent components. We present a first attempt at statistically and systematically characterizing coherent infrasound recorded by the IMS. We perform broadband (0.01-5Hz) array processing with the IMS continuous waveform archive (39 stations from 1 April 2005 to 31 December 2010) using an implementation of the Progressive Multi-Channel Correlation algorithm in logfrequency space. From these results, we estimate multi-year 5th, 50th, and 95th percentiles of the RMS pressure of coherent signals in 15 frequency bands for each station. We compare the resulting coherent infrasound models with raw power spectral density noise models, which inherently include both incoherent and coherent components. Our results indicate that IMS arrays consistently record coherent ambient infrasound across the broad frequency range from 0.01 to 5Hz when wind noise levels permit. The multi-year averaging emphasizes continuous signals such as oceanic microbaroms, as well as persistent transient signals such as repetitive volcanic, surf, thunder, or anthropogenic activity. Systematic characterization of coherent infrasound detection is important for quantifying a station's recording environment, signal-to-noise ratio as a function of frequency and direction, and overall performance, which all influence the detection probability of specific signals of interest. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84874918816&doi=10.1029%2f2012GL054329&partnerID=40&md5=67224b30a790a8a56d2a4a7f02289eec
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6640
Appears in Collections: 气候减缓与适应
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作者单位: CEA/DAM/DIF, Arpajon, France
Recommended Citation:
Matoza R.S.,Landès M.,Le Pichon A.,et al. Coherent ambient infrasound recorded by the International Monitoring System[J]. Geophysical Research Letters,2013-01-01,40(2).