DOI: 10.1002/2013GL058801
论文题名: Evanescent wave coupling in a geophysical system: Airborne acoustic signals from the Mw 8.1 Macquarie Ridge earthquake
作者: Evers L.G. ; Brown D. ; Heaney K.D. ; Assink J.D. ; Smets P.S.M. ; Snellen M.
刊名: Geophysical Research Letters
ISSN: 0094-10304
EISSN: 1944-10035
出版年: 2014
卷: 41, 期: 5 起始页码: 1644
结束页码: 1650
语种: 英语
英文关键词: earthquake
; hydroacoustics
; infrasound
; seismology
Scopus关键词: Acoustic waves
; Earth atmosphere
; Electromagnetic wave reflection
; Geophysics
; Seismology
; Surface waters
; Transparency
; Underwater acoustics
; Air-borne acoustic
; Geophysical process
; Geophysical systems
; Hydroacoustic waves
; Infrasound
; Low-frequency sounds
; Sound fixing and ranging channels
; Water-air interface
; Earthquakes
; acoustic wave
; air-water interaction
; earthquake magnitude
; hydrophone
; infrasonics
; seismic wave
; seismology
; underwater environment
; Macquarie Ridge
; Pacific Ocean
英文摘要: Atmospheric low-frequency sound, i.e., infrasound, from underwater events has not been considered thus far, due to the high impedance contrast of the water-air interface making it almost fully reflective. Here we report for the first time on atmospheric infrasound from a large underwater earthquake (M w 8.1) near the Macquarie Ridge, which was recorded at 1325 km from the epicenter. Seismic waves coupled to hydroacoustic waves at the ocean floor, after which the energy entered the Sound Fixing and Ranging channel and was detected on a hydrophone array. The energy was diffracted by a seamount and an oceanic ridge, which acted as a secondary source, into the water column followed by coupling into the atmosphere. The latter results from evanescent wave coupling and the attendant anomalous transparency of the sea surface for very low frequency acoustic waves. Key Points Evanescent wave coupling links the solid Earth, oceans, and atmosphere Acoustic waves use anomalous transparency of the water-air interface Underwater geophysical processes and events can be heard in the atmosphere ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895777908&doi=10.1002%2f2013GL058801&partnerID=40&md5=9a73208d4211e7667215df9dcb1d1a5d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7568
Appears in Collections: 气候减缓与适应
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作者单位: Seismology Division, Royal Netherlands Meteorological Institute, De Bilt, Netherlands
Recommended Citation:
Evers L.G.,Brown D.,Heaney K.D.,et al. Evanescent wave coupling in a geophysical system: Airborne acoustic signals from the Mw 8.1 Macquarie Ridge earthquake[J]. Geophysical Research Letters,2014-01-01,41(5).